Remote Technical Leadership Jobs

276 to 300 of 650 Remote Technical Leadership Jobs

Solutions Architect – Payment Platforms & POS Integration

slough, south east england, united kingdom
Hybrid / WFH Options
YQN Pay
a high-growth fintech scale-up as a Solutions Architect, designing robust, scalable POS and payment infrastructure platforms from the ground up. You will architect backend systems and lead technical execution with the support of external developers, SDK partners, and SaaS integrations. This is an opportunity to grow into a senior leadership role as the business expands. Key … with open API-first strategies, supporting both in-house and external partner development. Define modular, resilient system architecture focused on interoperability, rapid iteration, performance, and security. Document and communicate technical designs and integration patterns for both technical vendors and internal teams. Oversee and collaborate with external development partners; support custom integration, SDK rollout, and post-launch operations. Develop … . Ability to collaborate effectively in cross-functional teams (product, external developers, compliance). Willingness to drive change, iterate quickly, and grow with business needs, including stepping into elevated leadership roles. Degree in Computer Science, Engineering or related discipline. Opportunity & Growth This role is designed for ambitious technologists ready to architect foundational POS and payments infrastructure – and to grow More ❯
Posted:

Solutions Architect – Payment Platforms & POS Integration

london (city of london), south east england, united kingdom
Hybrid / WFH Options
YQN Pay
a high-growth fintech scale-up as a Solutions Architect, designing robust, scalable POS and payment infrastructure platforms from the ground up. You will architect backend systems and lead technical execution with the support of external developers, SDK partners, and SaaS integrations. This is an opportunity to grow into a senior leadership role as the business expands. Key … with open API-first strategies, supporting both in-house and external partner development. Define modular, resilient system architecture focused on interoperability, rapid iteration, performance, and security. Document and communicate technical designs and integration patterns for both technical vendors and internal teams. Oversee and collaborate with external development partners; support custom integration, SDK rollout, and post-launch operations. Develop … . Ability to collaborate effectively in cross-functional teams (product, external developers, compliance). Willingness to drive change, iterate quickly, and grow with business needs, including stepping into elevated leadership roles. Degree in Computer Science, Engineering or related discipline. Opportunity & Growth This role is designed for ambitious technologists ready to architect foundational POS and payments infrastructure – and to grow More ❯
Posted:

Lead Full-Stack Developer

City of London, London, United Kingdom
Hybrid / WFH Options
Reed Technology
landscape through AI-driven, human-centered technology. This is a pivotal role where you will lead a team of 5 Senior Developers, focusing on hands-on coding and providing technical leadership underneath the guidance of the Head of AI & Technology. Day-to-day of the role: Lead and mentor a team of 5 Senior Developers, maintaining a hands … AI tools, APIs, and data pipelines to enhance platform intelligence. Promote engineering best practices such as testing, CI/CD, and secure coding standards. Conduct code reviews and provide technical mentorship. Collaborate with the Head of AI and Technology to align development priorities with business objectives. Foster a culture of collaboration, continuous learning, and high performance. Troubleshoot and resolve … production. Strong background in software architecture, microservices, and API design. Hands-on experience with cloud platforms (AWS, Azure, or GCP). Excellent communication skills, capable of motivating and aligning technical teams. Desirable: Experience with AI tools, APIs, ML pipelines, containerisation (Docker/Kubernetes), event-driven architecture (Kafka/RabbitMQ). Benefits: Hybrid working model (minimum 3 days a week More ❯
Employment Type: Permanent, Work From Home
Posted:

Solutions Architect

City of London, London, United Kingdom
Hybrid / WFH Options
Anson McCade
Lead and coordinate high-impact initiatives like the UK's ventilator challenge, IoT cloud platform launches, and revolutionary healthcare systems. Design and deliver cutting-edge business solutions, applying your technical prowess to drive tangible results. Act as a technical leader, guiding teams through complex production software development challenges. Mentor stakeholders and provide strategic architectural guidance through insightful roadmaps. … What You Bring: Proven experience providing technical leadership across various architecture domains, specializing in at least one (e.g., Business, Sector, Technologies/vendors). Ability to perform solution options assessment, product selection, and analysis of sourcing approaches. Proficiency in architecture modeling tools and frameworks (UML, ArchiMate, etc.). Strong commercial acumen, complementing your technical expertise. Extensive experience … cloud architectures, digital transformation enablement, and IoT. Understanding of the architect's role in agile delivery methodologies. Join and be part of a team where your innovative thinking and technical proficiency drive impactful change. You'll have access to continuous learning opportunities, certifications, and a supportive mentoring program. More ❯
Posted:

Solutions Architect

London Area, United Kingdom
Hybrid / WFH Options
Anson McCade
Lead and coordinate high-impact initiatives like the UK's ventilator challenge, IoT cloud platform launches, and revolutionary healthcare systems. Design and deliver cutting-edge business solutions, applying your technical prowess to drive tangible results. Act as a technical leader, guiding teams through complex production software development challenges. Mentor stakeholders and provide strategic architectural guidance through insightful roadmaps. … What You Bring: Proven experience providing technical leadership across various architecture domains, specializing in at least one (e.g., Business, Sector, Technologies/vendors). Ability to perform solution options assessment, product selection, and analysis of sourcing approaches. Proficiency in architecture modeling tools and frameworks (UML, ArchiMate, etc.). Strong commercial acumen, complementing your technical expertise. Extensive experience … cloud architectures, digital transformation enablement, and IoT. Understanding of the architect's role in agile delivery methodologies. Join and be part of a team where your innovative thinking and technical proficiency drive impactful change. You'll have access to continuous learning opportunities, certifications, and a supportive mentoring program. More ❯
Posted:

Customer Architect

Plymouth, England, United Kingdom
Hybrid / WFH Options
Delt Shared Services Ltd
deliver IT solutions - we partner with our customers to transform their technology landscapes. The Customer Architect is a pivotal role, bridging the gap between our customers’ ambitions and our technical expertise. This is your opportunity to lead, advocate, and collaborate, helping shape IT strategies and solving complex challenges with clarity and confidence. The Opportunity As a trusted advisor, you … driving key changes, your contributions will help turn our customers’ visions into reality. What You’ll Be Doing Build deep, trusted relationships with customers, acting as their advocate and technical guide. Partner with customers to develop and refine their IT strategies, ensuring alignment with future trends and business needs. Keep Delt aligned with customer requirements by maintaining a clear … understanding of their technology stack, strategies, and objectives. Lead the design of tailored solutions, working with Delt teams to create practical and impactful proposals. Simplify complex technical concepts into clear, actionable insights for audiences at all levels, from front-line staff to C-suite leaders. Key Skills & Competencies We’re seeking an individual with a strong technical foundation More ❯
Posted:

Customer Architect

exeter, south west england, united kingdom
Hybrid / WFH Options
Delt Shared Services Ltd
deliver IT solutions - we partner with our customers to transform their technology landscapes. The Customer Architect is a pivotal role, bridging the gap between our customers’ ambitions and our technical expertise. This is your opportunity to lead, advocate, and collaborate, helping shape IT strategies and solving complex challenges with clarity and confidence. The Opportunity As a trusted advisor, you … driving key changes, your contributions will help turn our customers’ visions into reality. What You’ll Be Doing Build deep, trusted relationships with customers, acting as their advocate and technical guide. Partner with customers to develop and refine their IT strategies, ensuring alignment with future trends and business needs. Keep Delt aligned with customer requirements by maintaining a clear … understanding of their technology stack, strategies, and objectives. Lead the design of tailored solutions, working with Delt teams to create practical and impactful proposals. Simplify complex technical concepts into clear, actionable insights for audiences at all levels, from front-line staff to C-suite leaders. Key Skills & Competencies We’re seeking an individual with a strong technical foundation More ❯
Posted:

Sportsbook Solutions Architect

Ireland
Hybrid / WFH Options
The Unit
critical sportsbook operations (pricing, bet placement, settlement). Partner with product and delivery teams to translate business requirements into architectural blueprints, balancing performance, cost, and time-to-market. Provide technical mentorship across teams, ensuring adherence to 12 factor principles, contract first development, and test automation strategies. Requirements 7+ years of experience in software architecture or backend engineering, with at … in observability, monitoring, and tracing , with Prometheus/Grafana/ELK or equivalent. Familiarity with cloud agnostic deployments (AWS, GCP, or Azure) and cost/performance trade offs. Excellent technical leadership, communication, and documentation skills in English (upper intermediate or higher). What We Offer Competitive salary that matches your skills, with regular reviews to keep it in More ❯
Employment Type: Permanent
Salary: EUR 125,000 - 150,000 Annual
Posted:

Senior DevOps Engineer - £400-700pd - ID43872

Oxfordshire, England, United Kingdom
Hybrid / WFH Options
Humand Talent
compliance experience Why Join A collaborative, supportive environment where engineers are trusted and empowered Hybrid working with flexibility, based in Oxfordshire The opportunity to shape infrastructure strategy and influence technical direction A pathway into leadership and greater responsibility Broad exposure to modern tooling, cloud platforms, and cross-functional projects Ready to Apply? If you're a DevOps Engineer … with strong cloud knowledge, hands-on Kubernetes or automation experience, and a desire to take on broader technical leadership, we’d love to hear from you . Even if you don’t tick every box, your experience could still be a great fit. Apply now to explore the opportunity. We Welcome Diverse Perspectives Our client and our agency More ❯
Posted:

Senior DevOps Engineer - £400-700pd - ID43872

Oxford, Oxfordshire, United Kingdom
Hybrid / WFH Options
compliance experience Why Join A collaborative, supportive environment where engineers are trusted and empowered Hybrid working with flexibility, based in Oxfordshire The opportunity to shape infrastructure strategy and influence technical direction A pathway into leadership and greater responsibility Broad exposure to modern tooling, cloud platforms, and cross-functional projects Ready to Apply? If you're a DevOps Engineer … with strong cloud knowledge, hands-on Kubernetes or automation experience, and a desire to take on broader technical leadership, we d love to hear from you . Even if you don t tick every box, your experience could still be a great fit. Apply now to explore the opportunity. We Welcome Diverse Perspectives Our client and our agency More ❯
Posted:

DATA INTEGRATION ARCHITECT - 100% remote

Rockville, Maryland, United States
Hybrid / WFH Options
ALTA IT Services
multi-program effort to enhance data integration, streamline business processes, and improve transparency across housing and community services. The Solution Architect (Data Integration & Modernization) will serve as a key technical strategist and architect, responsible for designing and implementing the integration of multiple housing-related systems into a unified digital platform. This role will establish the foundation for the client … Landlord & Tenant, Rent Stabilization, and Common Ownership Communities). Architect and document data flows, APIs, and ETL processes to support unified reporting and program interoperability. Partner with business and technical stakeholders to analyze requirements, model business processes, and define data governance standards. Develop and maintain technical design documents, including integration blueprints, ER diagrams, data mappings, and traceability matrices. … term goals for automation, predictive analytics, and data quality. Collaborate with internal teams and external vendors to manage system interfaces, testing, and deployment within Agile/DevOps environments. Provide technical leadership and mentorship, ensuring adherence to best practices in system design, performance, and maintainability. Qualifications & Experience: Required: Proven experience as a Solution Architect, Data Integration Architect, or Senior More ❯
Employment Type: Permanent
Salary: USD Annual
Posted:

Senior / Lead Shopify Developer

City of London, London, United Kingdom
Hybrid / WFH Options
Halian | Managed Services, Recruitment Agency & Contract Staffing
/Lead Shopify Developer to join our fully remote team — someone who can take ownership of complex Shopify projects, guide our development team, and drive best practices across our technical delivery. The Role As a Senior/Lead Shopify Developer , you’ll be responsible for leading technical builds across a range of Shopify Plus projects. You’ll collaborate … performant, scalable, and beautifully crafted ecommerce experiences. You’ll also play a key role in mentoring junior developers, defining coding standards, and contributing to architectural decisions that shape our technical direction as a Platinum Partner agency. Key Responsibilities Lead end-to-end Shopify and Shopify Plus development projects. Architect, develop, and maintain custom Shopify themes and apps. Implement clean … performance and scalability. Integrate third-party APIs and custom functionality using Shopify’s API and GraphQL. Stay ahead of emerging Shopify features, trends, and best practices. Provide mentorship and technical leadership to other developers. Participate in code reviews, technical planning, and project estimations.' Required Skills & Experience 5+ years of professional experience in web development, with at least More ❯
Posted:

Senior / Lead Shopify Developer

London Area, United Kingdom
Hybrid / WFH Options
Halian | Managed Services, Recruitment Agency & Contract Staffing
/Lead Shopify Developer to join our fully remote team — someone who can take ownership of complex Shopify projects, guide our development team, and drive best practices across our technical delivery. The Role As a Senior/Lead Shopify Developer , you’ll be responsible for leading technical builds across a range of Shopify Plus projects. You’ll collaborate … performant, scalable, and beautifully crafted ecommerce experiences. You’ll also play a key role in mentoring junior developers, defining coding standards, and contributing to architectural decisions that shape our technical direction as a Platinum Partner agency. Key Responsibilities Lead end-to-end Shopify and Shopify Plus development projects. Architect, develop, and maintain custom Shopify themes and apps. Implement clean … performance and scalability. Integrate third-party APIs and custom functionality using Shopify’s API and GraphQL. Stay ahead of emerging Shopify features, trends, and best practices. Provide mentorship and technical leadership to other developers. Participate in code reviews, technical planning, and project estimations.' Required Skills & Experience 5+ years of professional experience in web development, with at least More ❯
Posted:

Solutions Architect Hybrid /Stevenage

Stevenage, Hertfordshire, England, United Kingdom
Hybrid / WFH Options
Akkodis
based Centre of Excellence. This role involves designing and delivering scalable, secure cloud and software solutions for major public and private sector programmes. Key Responsibilities: Design end-to-end technical solutions aligned with business goals Collaborate with stakeholders and delivery teams Ensure compliance with security and governance standards Support pre-sales and provide technical leadership Requirements: 7+ More ❯
Employment Type: Full-Time
Salary: £70,000 - £90,000 per annum
Posted:

Principal .Net Developer

Belfast, UK
Hybrid / WFH Options
Ocho
OCHO | Building Teams The Opportunity Were hiring a Principal Software Engineer to join a high-performing engineering organisation responsible for delivering business-critical platforms at scale. This is a technical leadership role offering full architectural ownership, hands-on delivery, and the chance to guide engineering standards across a cross-functional team. Youll lead by example , setting the technical More ❯
Posted:

Enterprise Architect

London Area, United Kingdom
Hybrid / WFH Options
Premier Group
Structure: Reports to CIO Working Hours: 35 hours per week standard Anticipated Start: Immediate opening Core Responsibilities: Create organization-wide IT design frameworks and documents to inform and direct leadership decisions. Outline the long-term technical environment and craft technology roadmaps detailing the progression from the present setup to the desired future state. Implement and run the organization … operational shifts through enhancing technology, information handling procedures, team structure, and job roles. Balance conflicting priorities like features, service reliability, financial efficiency, and necessary system management. Provide mentorship to technical personnel on important choices regarding architecture, tooling, and data management strategies. Ensure full adherence to security, data privacy, and all relevant statutory mandates. Translate complex technical concepts into … clear language for non-technical leadership Critical Background & Expertise: Experience creating and maintaining transition plans/roadmaps to guide the journey from the current system to the ideal future environment. Proven ability to use architectural frameworks to genuinely influence alterations in the organizational structure, workflows, data management, business applications, and infrastructure. Track record of building roadmaps for migrating More ❯
Posted:

Enterprise Architect

City of London, London, United Kingdom
Hybrid / WFH Options
Premier Group
Structure: Reports to CIO Working Hours: 35 hours per week standard Anticipated Start: Immediate opening Core Responsibilities: Create organization-wide IT design frameworks and documents to inform and direct leadership decisions. Outline the long-term technical environment and craft technology roadmaps detailing the progression from the present setup to the desired future state. Implement and run the organization … operational shifts through enhancing technology, information handling procedures, team structure, and job roles. Balance conflicting priorities like features, service reliability, financial efficiency, and necessary system management. Provide mentorship to technical personnel on important choices regarding architecture, tooling, and data management strategies. Ensure full adherence to security, data privacy, and all relevant statutory mandates. Translate complex technical concepts into … clear language for non-technical leadership Critical Background & Expertise: Experience creating and maintaining transition plans/roadmaps to guide the journey from the current system to the ideal future environment. Proven ability to use architectural frameworks to genuinely influence alterations in the organizational structure, workflows, data management, business applications, and infrastructure. Track record of building roadmaps for migrating More ❯
Posted:

Enterprise Architect

london, south east england, united kingdom
Hybrid / WFH Options
Premier Group
Structure: Reports to CIO Working Hours: 35 hours per week standard Anticipated Start: Immediate opening Core Responsibilities: Create organization-wide IT design frameworks and documents to inform and direct leadership decisions. Outline the long-term technical environment and craft technology roadmaps detailing the progression from the present setup to the desired future state. Implement and run the organization … operational shifts through enhancing technology, information handling procedures, team structure, and job roles. Balance conflicting priorities like features, service reliability, financial efficiency, and necessary system management. Provide mentorship to technical personnel on important choices regarding architecture, tooling, and data management strategies. Ensure full adherence to security, data privacy, and all relevant statutory mandates. Translate complex technical concepts into … clear language for non-technical leadership Critical Background & Expertise: Experience creating and maintaining transition plans/roadmaps to guide the journey from the current system to the ideal future environment. Proven ability to use architectural frameworks to genuinely influence alterations in the organizational structure, workflows, data management, business applications, and infrastructure. Track record of building roadmaps for migrating More ❯
Posted:

Enterprise Architect

slough, south east england, united kingdom
Hybrid / WFH Options
Premier Group
Structure: Reports to CIO Working Hours: 35 hours per week standard Anticipated Start: Immediate opening Core Responsibilities: Create organization-wide IT design frameworks and documents to inform and direct leadership decisions. Outline the long-term technical environment and craft technology roadmaps detailing the progression from the present setup to the desired future state. Implement and run the organization … operational shifts through enhancing technology, information handling procedures, team structure, and job roles. Balance conflicting priorities like features, service reliability, financial efficiency, and necessary system management. Provide mentorship to technical personnel on important choices regarding architecture, tooling, and data management strategies. Ensure full adherence to security, data privacy, and all relevant statutory mandates. Translate complex technical concepts into … clear language for non-technical leadership Critical Background & Expertise: Experience creating and maintaining transition plans/roadmaps to guide the journey from the current system to the ideal future environment. Proven ability to use architectural frameworks to genuinely influence alterations in the organizational structure, workflows, data management, business applications, and infrastructure. Track record of building roadmaps for migrating More ❯
Posted:

Enterprise Architect

london (city of london), south east england, united kingdom
Hybrid / WFH Options
Premier Group
Structure: Reports to CIO Working Hours: 35 hours per week standard Anticipated Start: Immediate opening Core Responsibilities: Create organization-wide IT design frameworks and documents to inform and direct leadership decisions. Outline the long-term technical environment and craft technology roadmaps detailing the progression from the present setup to the desired future state. Implement and run the organization … operational shifts through enhancing technology, information handling procedures, team structure, and job roles. Balance conflicting priorities like features, service reliability, financial efficiency, and necessary system management. Provide mentorship to technical personnel on important choices regarding architecture, tooling, and data management strategies. Ensure full adherence to security, data privacy, and all relevant statutory mandates. Translate complex technical concepts into … clear language for non-technical leadership Critical Background & Expertise: Experience creating and maintaining transition plans/roadmaps to guide the journey from the current system to the ideal future environment. Proven ability to use architectural frameworks to genuinely influence alterations in the organizational structure, workflows, data management, business applications, and infrastructure. Track record of building roadmaps for migrating More ❯
Posted:

Lead IT Network Engineer

london, south east england, united kingdom
Hybrid / WFH Options
BITS Group
A fast-growing Managed Service Provider that's redefining what great IT support looks like for clients all over London and beyond. We are now looking for a senior technical engineer to help us not just deliver exceptional support services to our client base, but also help shape and grow the future of BITS Group through technical leadership and build a Centre of Excellence in Support Services alongside a culture like no other. You'll be our go-to expert for advanced technical projects, automation, cybersecurity, and use your exceptional relationship-building skills to mentor our growing team. You'll take ownership of complex environments, deliver exceptional client experiences, and play a key role in shaping … our internal systems, strategy, and standards. If you love the mix of technical challenge, autonomy, and being part of something that's growing fast — this is the role for you. Who we are. From nurseries and schools; to charities, care homes and estate agencies — our clients depend on us to keep them secure, connected and productive. We don't More ❯
Posted:

Java Developer / Team Lead - Sports Betting

Manchester, Lancashire, England, United Kingdom
Hybrid / WFH Options
Client Server Ltd
Java Developer/Team Lead Manchester/WFH to £80k Are you a hands-on technical leader with strong Java skills? You could be working on complex and interesting systems using the latest technology within a diverse, supportive environment whilst enjoying a range of perks and continual learning opportunities at a global games software house. As a Java Developer … and inspiring a small, high-performing development team, working on real-time in sports betting applications. This is an excellent opportunity for a hands-on leader who enjoys balancing technical delivery with team development and collaboration, with approximately a 50/50 split between hands-on architecture and coding and people management (coaching, mentoring). Collaborating closely with the … experience You have strong Java, Spring and AWS experience You also have experience with Kafka for data streaming You have a good knowledge of Docker and Kubernetes You have technical leadership, mentoring and coaching experience, you're an advocate of software engineering best practices You're collaborative and pragmatic with great communication and stakeholder management skills What's More ❯
Employment Type: Full-Time
Salary: £70,000 - £80,000 per annum
Posted:

Senior Software Engineer - Flutter

City of London, London, United Kingdom
Hybrid / WFH Options
Harvey Nash
Senior Mobile Engineer/Technical Lead – Mobile (Flutter) Up to £110,000 + Benefits Central London, 4 Days On-Site + 1 Day Remote 80% Hands on/20% Leadership Can Provide Sponsorship We are working with an established SaaS business that has been driving innovation in the logistics and transport industry for over 25 years. Backed by … significant investment in new products, they combine the buzz of a scale-up with the stability of a trusted name. Right now, they are looking for a Technical Lead (Mobile – Flutter) to take full ownership of their mobile ecosystem. Why this role stands out This is not just another hands-on coding position. You’ll be setting the technical … using Flutter and Dart Lead coding standards, code reviews and release cycles Drive mobile best practice around security, testing and performance Mentor and guide engineers through 1:1s and technical coaching Collaborate with DevOps, architects, product, design and QA to deliver seamless solutions Tackle production issues quickly and effectively with a root cause mindset What we are looking for More ❯
Posted:

Senior Software Engineer - Flutter

London Area, United Kingdom
Hybrid / WFH Options
Harvey Nash
Senior Mobile Engineer/Technical Lead – Mobile (Flutter) Up to £110,000 + Benefits Central London, 4 Days On-Site + 1 Day Remote 80% Hands on/20% Leadership Can Provide Sponsorship We are working with an established SaaS business that has been driving innovation in the logistics and transport industry for over 25 years. Backed by … significant investment in new products, they combine the buzz of a scale-up with the stability of a trusted name. Right now, they are looking for a Technical Lead (Mobile – Flutter) to take full ownership of their mobile ecosystem. Why this role stands out This is not just another hands-on coding position. You’ll be setting the technical … using Flutter and Dart Lead coding standards, code reviews and release cycles Drive mobile best practice around security, testing and performance Mentor and guide engineers through 1:1s and technical coaching Collaborate with DevOps, architects, product, design and QA to deliver seamless solutions Tackle production issues quickly and effectively with a root cause mindset What we are looking for More ❯
Posted:

Solution Architect - Airline Ops

Luton, England, United Kingdom
Hybrid / WFH Options
easyJet
million passengers a year, we employ over 12,000 people. Its big-scale stuff and we’re still growing. TEAM IT Architecture incorporates the Enterprise Architecture, Solution Architecture, Technical Architecture, Data Architecture, Cyber Security Architecture plus oversight of Principle Software Engineers working within our Technology & Product delivery teams. We own the overall direction of easyJet’s IT landscape across … of Products, Principal Software Engineers, and Product Managers to define the architectural runway for future requirements and delivers key business outcomes. Assess our technology landscape to identify deficiencies and technical debts, while staying ahead of emerging trends to ensure our solutions are modern and well-aligned with business needs. Support product managers in making key product architecture decisions and … oversight to ensure that delivered solutions align with the defined blueprints and our broader IT strategy. You will be responsible for reviewing designs, holding vendors accountable, and ensuring the technical integrity of our products and platforms. Lead the solution architecture definition for for a broader scope of products, working with Technical Architects/Principal Software Engineers covering each More ❯
Posted:
Technical Leadership
Work from Home
10th Percentile
£53,360
25th Percentile
£68,250
Median
£80,000
75th Percentile
£95,000
90th Percentile
£107,500