Permanent 'API Design' Job Vacancies

351 to 375 of 466 Permanent API Design Jobs

Technical Business Analyst

Belfast, United Kingdom
Hybrid / WFH Options
PA Consulting
We believe in the power of ingenuity to build a positive human future. We challenge where it matters and own the outcome. We combine strategic thinking, customer-centric service design, and agile engineering practices to accelerate innovation in a tech-driven world. Why consider joining our Digital & Data community? Join our Digital & Data team working alongside product, design … work with the following technologies to ensure scalable, high-performance applications: .NET (including Entity Framework 6 and Core, ASP.NET MVC and MVC Core) CSS, HTML, JavaScript/Typescript REST API design Microsoft SQL Server, MySQL, Postgres AWS What you can expect Work to agile best practices and cross-functionally with multiple teams and stakeholders. You'll be using More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Integration Engineer

England, United Kingdom
Futuris Recruitment
We're looking for a Integration Engineer for a customer project that's initiating in the UK. About the Project We’re supporting a leading API-led supply chain platform on an integration project that connects their system with Microsoft Dynamics 365 Business Central (BC). The goal is to enhance and extend an existing API integration to … workflow. What You’ll Be Doing You’ll act as a hands-on consultant leading the technical implementation of this integration. That includes analysing current data flows, extending the API mapping, building synchronisation logic, and ensuring robust testing and documentation. You’ll work closely with both the engineering team and the client’s Dynamics BC specialists to deliver a … smooth, production-ready solution. Requirements:- Strong experience integrating with Microsoft Dynamics 365 Business Central/NAV APIs. Proven background in REST API design, mapping, and bidirectional data synchronisation. Solid understanding of ERP workflows (orders, pricing, inventory, invoicing). Hands-on experience with C#, Power Automate, or Azure Functions for integration work. Comfortable reading and understanding code in Go More ❯
Posted:

Firmware Support Engineer

Morecambe, Lancashire, England, United Kingdom
UK Talent Resource
role in our success. Your Role: Bridging Development & Customer Success As a Firmware Support Engineer, you will be responsible for the end-to-end lifecycle of our firmware, from design and development to post-deployment support. Your expertise in Modbus RTU/TCP and M-Bus will be critical. Key Responsibilities: Design & Development: Create, develop, and test firmware … Customer-Facing Support: Act as the primary technical contact for customers, providing clear, expert support on our products and protocols. Hardware Collaboration: Work with hardware teams; knowledge of PCB design and assembly is a plus for effective troubleshooting. Full Lifecycle Involvement: Participate in requirements definition, unit testing, API design, and maintaining documentation in Confluence. What We're … debugging complex system issues. Strong communication skills, with the ability to explain technical concepts clearly to customers and colleagues. Desirable Skills: Experience with IoT device development. Familiarity with PCB design, assembly, and troubleshooting. Knowledge of test automation frameworks. What We Offer You: Competitive Salary: A competitive package of up to £50,000, dependent on your experience. Specialist Role: Become More ❯
Employment Type: Full-Time
Salary: £35,000 - £50,000 per annum, Negotiable
Posted:

Senior AI Engineer

London Area, United Kingdom
Hybrid / WFH Options
Revoco
London - Hybrid (2 day's onsite p/w) Start Date: ASAP Salary: £90,000 - £95,000 + 3-8% Bonus We are seeking a Senior AI Engineer to design, build, and deploy advanced AI and machine learning solutions for a leading research platform. This is a hands-on role focused on production-grade LLM applications, AI-enabled workflows … will collaborate closely with engineering, research, analytics, and product teams to drive innovation and deliver impactful solutions. Key Responsibilities: - Data & Retrieval: Build ingestion pipelines for structured and unstructured data; design retrieval-augmented generation (RAG) systems; manage vector and keyword indexes; develop NLP and recommendation systems; implement metadata and tagging frameworks. - LLM & ML Applications: Develop and maintain ML and LLM … and production services; mentor junior engineers; stay updated with AI/ML and domain trends. Skills & Experience: - Demonstrated hands-on experience building production AI/LLM applications. - Strong Python, API design, asynchronous programming, and integration skills. - Experience with ML/LLM frameworks (PyTorch, TensorFlow, scikit-learn, LangChain/LangGraph, LlamaIndex). - Familiarity with cloud deployment (Azure), CI/ More ❯
Posted:

Senior AI Engineer

City of London, London, United Kingdom
Hybrid / WFH Options
Revoco
London - Hybrid (2 day's onsite p/w) Start Date: ASAP Salary: £90,000 - £95,000 + 3-8% Bonus We are seeking a Senior AI Engineer to design, build, and deploy advanced AI and machine learning solutions for a leading research platform. This is a hands-on role focused on production-grade LLM applications, AI-enabled workflows … will collaborate closely with engineering, research, analytics, and product teams to drive innovation and deliver impactful solutions. Key Responsibilities: - Data & Retrieval: Build ingestion pipelines for structured and unstructured data; design retrieval-augmented generation (RAG) systems; manage vector and keyword indexes; develop NLP and recommendation systems; implement metadata and tagging frameworks. - LLM & ML Applications: Develop and maintain ML and LLM … and production services; mentor junior engineers; stay updated with AI/ML and domain trends. Skills & Experience: - Demonstrated hands-on experience building production AI/LLM applications. - Strong Python, API design, asynchronous programming, and integration skills. - Experience with ML/LLM frameworks (PyTorch, TensorFlow, scikit-learn, LangChain/LangGraph, LlamaIndex). - Familiarity with cloud deployment (Azure), CI/ More ❯
Posted:

Senior AI Engineer

South East, United Kingdom
Hybrid / WFH Options
Revoco
London - Hybrid (2 day's onsite p/w) Start Date: ASAP Salary: £90,000 - £95,000 + 3-8% Bonus We are seeking a Senior AI Engineer to design, build, and deploy advanced AI and machine learning solutions for a leading research platform. This is a hands-on role focused on production-grade LLM applications, AI-enabled workflows … will collaborate closely with engineering, research, analytics, and product teams to drive innovation and deliver impactful solutions. Key Responsibilities: - Data & Retrieval: Build ingestion pipelines for structured and unstructured data; design retrieval-augmented generation (RAG) systems; manage vector and keyword indexes; develop NLP and recommendation systems; implement metadata and tagging frameworks. - LLM & ML Applications: Develop and maintain ML and LLM … and production services; mentor junior engineers; stay updated with AI/ML and domain trends. Skills & Experience: - Demonstrated hands-on experience building production AI/LLM applications. - Strong Python, API design, asynchronous programming, and integration skills. - Experience with ML/LLM frameworks (PyTorch, TensorFlow, scikit-learn, LangChain/LangGraph, LlamaIndex). - Familiarity with cloud deployment (Azure), CI/ More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Senior AI Engineer

london, south east england, united kingdom
Hybrid / WFH Options
Revoco
London - Hybrid (2 day's onsite p/w) Start Date: ASAP Salary: £90,000 - £95,000 + 3-8% Bonus We are seeking a Senior AI Engineer to design, build, and deploy advanced AI and machine learning solutions for a leading research platform. This is a hands-on role focused on production-grade LLM applications, AI-enabled workflows … will collaborate closely with engineering, research, analytics, and product teams to drive innovation and deliver impactful solutions. Key Responsibilities: - Data & Retrieval: Build ingestion pipelines for structured and unstructured data; design retrieval-augmented generation (RAG) systems; manage vector and keyword indexes; develop NLP and recommendation systems; implement metadata and tagging frameworks. - LLM & ML Applications: Develop and maintain ML and LLM … and production services; mentor junior engineers; stay updated with AI/ML and domain trends. Skills & Experience: - Demonstrated hands-on experience building production AI/LLM applications. - Strong Python, API design, asynchronous programming, and integration skills. - Experience with ML/LLM frameworks (PyTorch, TensorFlow, scikit-learn, LangChain/LangGraph, LlamaIndex). - Familiarity with cloud deployment (Azure), CI/ More ❯
Posted:

Senior AI Engineer

london (city of london), south east england, united kingdom
Hybrid / WFH Options
Revoco
London - Hybrid (2 day's onsite p/w) Start Date: ASAP Salary: £90,000 - £95,000 + 3-8% Bonus We are seeking a Senior AI Engineer to design, build, and deploy advanced AI and machine learning solutions for a leading research platform. This is a hands-on role focused on production-grade LLM applications, AI-enabled workflows … will collaborate closely with engineering, research, analytics, and product teams to drive innovation and deliver impactful solutions. Key Responsibilities: - Data & Retrieval: Build ingestion pipelines for structured and unstructured data; design retrieval-augmented generation (RAG) systems; manage vector and keyword indexes; develop NLP and recommendation systems; implement metadata and tagging frameworks. - LLM & ML Applications: Develop and maintain ML and LLM … and production services; mentor junior engineers; stay updated with AI/ML and domain trends. Skills & Experience: - Demonstrated hands-on experience building production AI/LLM applications. - Strong Python, API design, asynchronous programming, and integration skills. - Experience with ML/LLM frameworks (PyTorch, TensorFlow, scikit-learn, LangChain/LangGraph, LlamaIndex). - Familiarity with cloud deployment (Azure), CI/ More ❯
Posted:

Senior AI Engineer

slough, south east england, united kingdom
Hybrid / WFH Options
Revoco
London - Hybrid (2 day's onsite p/w) Start Date: ASAP Salary: £90,000 - £95,000 + 3-8% Bonus We are seeking a Senior AI Engineer to design, build, and deploy advanced AI and machine learning solutions for a leading research platform. This is a hands-on role focused on production-grade LLM applications, AI-enabled workflows … will collaborate closely with engineering, research, analytics, and product teams to drive innovation and deliver impactful solutions. Key Responsibilities: - Data & Retrieval: Build ingestion pipelines for structured and unstructured data; design retrieval-augmented generation (RAG) systems; manage vector and keyword indexes; develop NLP and recommendation systems; implement metadata and tagging frameworks. - LLM & ML Applications: Develop and maintain ML and LLM … and production services; mentor junior engineers; stay updated with AI/ML and domain trends. Skills & Experience: - Demonstrated hands-on experience building production AI/LLM applications. - Strong Python, API design, asynchronous programming, and integration skills. - Experience with ML/LLM frameworks (PyTorch, TensorFlow, scikit-learn, LangChain/LangGraph, LlamaIndex). - Familiarity with cloud deployment (Azure), CI/ More ❯
Posted:

Applications Architect - Modernisation

England, United Kingdom
DXC Technology Inc
modernisation opportunities. + Develop modernisation roadmaps aligned with enterprise architecture and business strategy. + Recommend appropriate cloud platforms, microservices architectures, and modernization patterns (e.g., rehost, refactor, rearchitect). Architecture & Design: + Design scalable, resilient, and secure application architectures using modern technologies (e.g., containers, serverless, APIs). + Define integration strategies with existing systems and third-party services. + … across the application portfolio. Skills Required: Proven experience in application architecture and modernisation projects. Strong knowledge of public and hybrid cloud platforms. Expertise in microservices, containerization (Docker, Kubernetes), and API design. Familiarity with legacy systems (e.g., monolithic applications, mainframes) and migration strategies. Experience with Agile and DevOps practices and CI/CD pipelines. Excellent communication and stakeholder management skills. More ❯
Employment Type: Permanent
Salary: GBP Annual
Posted:

Full Stack Engineer (React Native)

London Area, United Kingdom
Twelve
Rigor: Balancing fast iteration with the high standards required in a regulated fintech environment, championing best practices in testing and observability. 🤝 Collaboration: Working closely with the CTO, product, and design teams to translate user needs into technical solutions. What They're Looking For ✅ Full Stack Proficiency: Strong fundamentals with comfort building both user interfaces and backend services using TypeScript … React, and Node.js/NestJS. 🚀 Mobile Focus: Proficiency with React Native to lead the build-out of the mobile product. 💾 Database & Cloud: Experience with relational databases (Postgres preferred), clean API design, and cloud infrastructure (AWS, Docker, CI/CD). 🔒 Security Mindset: Familiarity with secure coding and data privacy principles, ideally within fintech or other regulated domains. 💡 Mission More ❯
Posted:

Full Stack Engineer (React Native)

City of London, London, United Kingdom
Twelve
Rigor: Balancing fast iteration with the high standards required in a regulated fintech environment, championing best practices in testing and observability. 🤝 Collaboration: Working closely with the CTO, product, and design teams to translate user needs into technical solutions. What They're Looking For ✅ Full Stack Proficiency: Strong fundamentals with comfort building both user interfaces and backend services using TypeScript … React, and Node.js/NestJS. 🚀 Mobile Focus: Proficiency with React Native to lead the build-out of the mobile product. 💾 Database & Cloud: Experience with relational databases (Postgres preferred), clean API design, and cloud infrastructure (AWS, Docker, CI/CD). 🔒 Security Mindset: Familiarity with secure coding and data privacy principles, ideally within fintech or other regulated domains. 💡 Mission More ❯
Posted:

Full Stack Engineer (React Native)

london, south east england, united kingdom
Twelve
Rigor: Balancing fast iteration with the high standards required in a regulated fintech environment, championing best practices in testing and observability. 🤝 Collaboration: Working closely with the CTO, product, and design teams to translate user needs into technical solutions. What They're Looking For ✅ Full Stack Proficiency: Strong fundamentals with comfort building both user interfaces and backend services using TypeScript … React, and Node.js/NestJS. 🚀 Mobile Focus: Proficiency with React Native to lead the build-out of the mobile product. 💾 Database & Cloud: Experience with relational databases (Postgres preferred), clean API design, and cloud infrastructure (AWS, Docker, CI/CD). 🔒 Security Mindset: Familiarity with secure coding and data privacy principles, ideally within fintech or other regulated domains. 💡 Mission More ❯
Posted:

Full Stack Engineer (React Native)

slough, south east england, united kingdom
Twelve
Rigor: Balancing fast iteration with the high standards required in a regulated fintech environment, championing best practices in testing and observability. 🤝 Collaboration: Working closely with the CTO, product, and design teams to translate user needs into technical solutions. What They're Looking For ✅ Full Stack Proficiency: Strong fundamentals with comfort building both user interfaces and backend services using TypeScript … React, and Node.js/NestJS. 🚀 Mobile Focus: Proficiency with React Native to lead the build-out of the mobile product. 💾 Database & Cloud: Experience with relational databases (Postgres preferred), clean API design, and cloud infrastructure (AWS, Docker, CI/CD). 🔒 Security Mindset: Familiarity with secure coding and data privacy principles, ideally within fintech or other regulated domains. 💡 Mission More ❯
Posted:

Full Stack Engineer (React Native)

london (city of london), south east england, united kingdom
Twelve
Rigor: Balancing fast iteration with the high standards required in a regulated fintech environment, championing best practices in testing and observability. 🤝 Collaboration: Working closely with the CTO, product, and design teams to translate user needs into technical solutions. What They're Looking For ✅ Full Stack Proficiency: Strong fundamentals with comfort building both user interfaces and backend services using TypeScript … React, and Node.js/NestJS. 🚀 Mobile Focus: Proficiency with React Native to lead the build-out of the mobile product. 💾 Database & Cloud: Experience with relational databases (Postgres preferred), clean API design, and cloud infrastructure (AWS, Docker, CI/CD). 🔒 Security Mindset: Familiarity with secure coding and data privacy principles, ideally within fintech or other regulated domains. 💡 Mission More ❯
Posted:

.Net Developer

City of London, London, United Kingdom
Caspian One
join them at inception of the project. This is a rare opportunity to influence best practices from the ground up, working directly with the FX Options trading desk to design and build a system that handles large volumes of market data in near real-time. Key Responsibilities: Design and develop scalable, high-performance systems using modern C# .Net … with a strong grasp of recent language features and .NET ecosystem Proven experience working with FX Options trading systems or directly with Options traders Solid understanding of systems integration, API design, and microservices architecture Experience handling large-scale market data in low-latency or real-time environments Hands-on experience converting monolithic applications into microservices Desirable: Exposure to More ❯
Posted:

.Net Developer

London Area, United Kingdom
Caspian One
join them at inception of the project. This is a rare opportunity to influence best practices from the ground up, working directly with the FX Options trading desk to design and build a system that handles large volumes of market data in near real-time. Key Responsibilities: Design and develop scalable, high-performance systems using modern C# .Net … with a strong grasp of recent language features and .NET ecosystem Proven experience working with FX Options trading systems or directly with Options traders Solid understanding of systems integration, API design, and microservices architecture Experience handling large-scale market data in low-latency or real-time environments Hands-on experience converting monolithic applications into microservices Desirable: Exposure to More ❯
Posted:

.Net Developer

london, south east england, united kingdom
Caspian One
join them at inception of the project. This is a rare opportunity to influence best practices from the ground up, working directly with the FX Options trading desk to design and build a system that handles large volumes of market data in near real-time. Key Responsibilities: Design and develop scalable, high-performance systems using modern C# .Net … with a strong grasp of recent language features and .NET ecosystem Proven experience working with FX Options trading systems or directly with Options traders Solid understanding of systems integration, API design, and microservices architecture Experience handling large-scale market data in low-latency or real-time environments Hands-on experience converting monolithic applications into microservices Desirable: Exposure to More ❯
Posted:

.Net Developer

london (city of london), south east england, united kingdom
Caspian One
join them at inception of the project. This is a rare opportunity to influence best practices from the ground up, working directly with the FX Options trading desk to design and build a system that handles large volumes of market data in near real-time. Key Responsibilities: Design and develop scalable, high-performance systems using modern C# .Net … with a strong grasp of recent language features and .NET ecosystem Proven experience working with FX Options trading systems or directly with Options traders Solid understanding of systems integration, API design, and microservices architecture Experience handling large-scale market data in low-latency or real-time environments Hands-on experience converting monolithic applications into microservices Desirable: Exposure to More ❯
Posted:

.Net Developer

slough, south east england, united kingdom
Caspian One
join them at inception of the project. This is a rare opportunity to influence best practices from the ground up, working directly with the FX Options trading desk to design and build a system that handles large volumes of market data in near real-time. Key Responsibilities: Design and develop scalable, high-performance systems using modern C# .Net … with a strong grasp of recent language features and .NET ecosystem Proven experience working with FX Options trading systems or directly with Options traders Solid understanding of systems integration, API design, and microservices architecture Experience handling large-scale market data in low-latency or real-time environments Hands-on experience converting monolithic applications into microservices Desirable: Exposure to More ❯
Posted:

Technology Risk & Assurance Analyst

Greater London, England, United Kingdom
Astrum Search
the business. Responsibilities: Provide project and delivery assurance across key technology and business initiatives Evaluate strategic alignment and ensure execution aligns with business intent Assess third-party risks, including API design, governance, and integration points Review and challenge SLAs and performance measures to ensure commercial relevance Lead assurance reviews over technology platforms, applications, and infrastructure Apply data analytics … outcomes Technically curious and confident engaging with engineers, data scientists, and delivery leads Familiar with Agile, DevOps, project governance, and third-party management Knowledgeable about performance measurement frameworks and API-related risks Experienced in (or curious about) agentic AI, data visualisation, and analytics If you are ready to combine technical depth with strategic impact and provide insights that drive More ❯
Posted:

Technology Risk & Assurance Analyst

london, south east england, united kingdom
Astrum Search
the business. Responsibilities: Provide project and delivery assurance across key technology and business initiatives Evaluate strategic alignment and ensure execution aligns with business intent Assess third-party risks, including API design, governance, and integration points Review and challenge SLAs and performance measures to ensure commercial relevance Lead assurance reviews over technology platforms, applications, and infrastructure Apply data analytics … outcomes Technically curious and confident engaging with engineers, data scientists, and delivery leads Familiar with Agile, DevOps, project governance, and third-party management Knowledgeable about performance measurement frameworks and API-related risks Experienced in (or curious about) agentic AI, data visualisation, and analytics If you are ready to combine technical depth with strategic impact and provide insights that drive More ❯
Posted:

Technology Risk & Assurance Analyst

slough, south east england, united kingdom
Astrum Search
the business. Responsibilities: Provide project and delivery assurance across key technology and business initiatives Evaluate strategic alignment and ensure execution aligns with business intent Assess third-party risks, including API design, governance, and integration points Review and challenge SLAs and performance measures to ensure commercial relevance Lead assurance reviews over technology platforms, applications, and infrastructure Apply data analytics … outcomes Technically curious and confident engaging with engineers, data scientists, and delivery leads Familiar with Agile, DevOps, project governance, and third-party management Knowledgeable about performance measurement frameworks and API-related risks Experienced in (or curious about) agentic AI, data visualisation, and analytics If you are ready to combine technical depth with strategic impact and provide insights that drive More ❯
Posted:

Senior Software Engineer

South East London, London, United Kingdom
Bright Purple Resourcing
fast to take things to the next level. Youll join as a Senior Backend Engineer , taking ownership of complex Python/Django services that power enterprise decarbonisation. Expect to design elegant APIs, tackle data-heavy challenges, and collaborate closely with sustainability experts and product teams. What makes this special? High-performance engineering team smart, passionate, and collaborative Big mission …/CD, and plenty of greenfield challenges Youll be a great fit if you bring: 7+ years backend experience (Python expertise essential) Strong knowledge of Django (or similar) and API design Experience scaling apps, with an eye for performance and reliability A proactive, problem-solving mindset and love for collaboration Enjoy a collaborative, chic, and modern office environment More ❯
Employment Type: Permanent
Salary: £95,000
Posted:

Senior Software Engineer

City of London, London, United Kingdom
Nando's UK & IRE
with Meraki APIs and other infrastructure systems to surface network and sensor insights Run proofs of concept for new in-restaurant technology such as kiosks or next-generation POS Design scalable configuration frameworks to support new hardware and future rollouts Contribute to incident response and ensure system reliability Partner with Operations and suppliers to enable smooth rollouts and minimise … and PowerShell for Windows-based automation and device integration Expert-level skills in TypeScript and Node.js Infrastructure as Code ( Terraform ) and CI/CD pipeline experience Solid understanding of API design and distributed system architecture Experience building modern UIs with Next.js or React Knowledge of networked devices , hardware APIs , and device provisioning Familiarity with Windows device management and More ❯
Posted:
API Design
10th Percentile
£52,500
25th Percentile
£61,250
Median
£75,000
75th Percentile
£100,000
90th Percentile
£132,500