MCS are excited to be supporting a forward-thinking technology company as they scale their engineering capabilities for the next phase of growth. We're searching for a PrincipalSoftwareEngineer with deep .NET expertise and strong experience cloud technologies (either AWS or Azure), to take a leading role in developing and evolving critical internal systems. This … leadership position suited to someone who thrives on technical ownership while coaching others to reach their potential. You'll play a key role in architecting and delivering enterprise-grade software, shaping everything from backend systems and CI/CD pipelines to infrastructure automation. What we're looking for: Strong background in .NET backend engineering, ideally within a regulated or … others that are. Please visit MCS Group to view a wide selection of our current and exclusive roles All conversations will be treated in the strictest of confidence. Skills: Software Developer SoftwareEngineerPrincipal developer C# .Net Benefits: Work From Home More ❯
Role: PrincipalSoftwareEngineer Salary: £70,000 £80,000 DOE Location: Cambridge We re looking for a PrincipalSoftwareEngineer to lead the design and optimisation of mission-critical communication systems. You ll shape technical direction, ensure performance and scalability, and mentor a talented development team within a growing technology business. Key …/CD pipelines and best practices Resolve complex technical issues to maintain system reliability Guide and mentor engineers to support continuous improvement Skills & Experience Required Degree in Computer Science, Software Engineering or similar 10+ years experience with C# and .NET (Core/5+) Strong background in scalable, distributed systems (microservices) Experience with messaging and data technologies (Kafka, RabbitMQ, gRPC … for critical systems Confident technical leadership and problem-solving skills Familiar with UI frameworks such as WPF and patterns like MVVM, MVP or MVC Desirable Experience planning and managing software projects Agile Scrum background Familiarity with Docker, Kotlin/Java and CI/CD tools Keywords C#, .NET, Microservices, Distributed Systems, Kafka, RabbitMQ, CI/CD, WPF, Agile, Docker More ❯
VANRATH are partnering with a global FinTech company to recruit for a PrincipalSoftwareEngineer to join a high-performing technology team. This is a fantastic opportunity to work on business-critical platforms used by major players in the global market. As the PrincipalSoftwareEngineer you will have the opportunity to work on … a forward-thinking team. What You'll Be Doing Provide technical mentorship to engineers and help align development efforts with project timelines and goals Design, develop, and support scalable software solutions Work closely with Business Analysts and Project Managers to refine and translate technical requirements Implement Infrastructure as Code (IaC) using AWS CDK with Python Manage and improve CI … participate in agile ceremonies and foster a collaborative agile environment Create and maintain clear technical documentation for architecture, design, and processes What You'll Bring Proven experience in a Principal .NET Engineering role Strong hands-on expertise in cloud technologies, particularly within AWS Solid understanding of unit testing, CI/CD pipelines, and Agile practices Experience with Entity Framework More ❯
City of London, London, United Kingdom Hybrid / WFH Options
Austin Werner
PrincipalSoftwareEngineer | High-growth, Purpose-Led and A* funded Fintech | Hybrid – London **Python, TypeScript, React** A leading fintech scale-up is hiring a Senior SoftwareEngineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to a platform designed to improve finance globally — with real impact at scale. … first platform. Backed by leading venture capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core. The Opportunity As a Senior Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data and transactions. You'll collaborate with product, data … and platform teams to deliver high-impact features that directly improve user financial wellbeing. This is a hands-on role for an engineer who values clean architecture, measurable outcomes, and meaningful user impact. What You’ll Do: Design and implement distributed systems that are resilient, scalable, and secure. Own technical decision-making across architecture and implementation — selecting the right More ❯
london, south east england, united kingdom Hybrid / WFH Options
Austin Werner
PrincipalSoftwareEngineer | High-growth, Purpose-Led and A* funded Fintech | Hybrid – London **Python, TypeScript, React** A leading fintech scale-up is hiring a Senior SoftwareEngineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to a platform designed to improve finance globally — with real impact at scale. … first platform. Backed by leading venture capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core. The Opportunity As a Senior Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data and transactions. You'll collaborate with product, data … and platform teams to deliver high-impact features that directly improve user financial wellbeing. This is a hands-on role for an engineer who values clean architecture, measurable outcomes, and meaningful user impact. What You’ll Do: Design and implement distributed systems that are resilient, scalable, and secure. Own technical decision-making across architecture and implementation — selecting the right More ❯
slough, south east england, united kingdom Hybrid / WFH Options
Austin Werner
PrincipalSoftwareEngineer | High-growth, Purpose-Led and A* funded Fintech | Hybrid – London **Python, TypeScript, React** A leading fintech scale-up is hiring a Senior SoftwareEngineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to a platform designed to improve finance globally — with real impact at scale. … first platform. Backed by leading venture capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core. The Opportunity As a Senior Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data and transactions. You'll collaborate with product, data … and platform teams to deliver high-impact features that directly improve user financial wellbeing. This is a hands-on role for an engineer who values clean architecture, measurable outcomes, and meaningful user impact. What You’ll Do: Design and implement distributed systems that are resilient, scalable, and secure. Own technical decision-making across architecture and implementation — selecting the right More ❯
london (city of london), south east england, united kingdom Hybrid / WFH Options
Austin Werner
PrincipalSoftwareEngineer | High-growth, Purpose-Led and A* funded Fintech | Hybrid – London **Python, TypeScript, React** A leading fintech scale-up is hiring a Senior SoftwareEngineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to a platform designed to improve finance globally — with real impact at scale. … first platform. Backed by leading venture capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core. The Opportunity As a Senior Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data and transactions. You'll collaborate with product, data … and platform teams to deliver high-impact features that directly improve user financial wellbeing. This is a hands-on role for an engineer who values clean architecture, measurable outcomes, and meaningful user impact. What You’ll Do: Design and implement distributed systems that are resilient, scalable, and secure. Own technical decision-making across architecture and implementation — selecting the right More ❯
PrincipalSoftwareEngineer & Tech Lead Leeds HQ (Flexible, Hybrid working) AI-Driven Solutions & Digital Transformation Are you a Principal-level engineer who wants to shape the future of AI-enabled digital products? WRK digital is partnering with Parallax a digital transformation consultancy pushing the boundaries of what AI can do for enterprise clients to find … should apply if: You have demonstrable experience building or delivering AI-enabled products You are an expert in Next.js (or similar), React, and AWS with a deep understanding of software architecture You balance technical leadership with hands-on codingyou are comfortable in both the boardroom and the codebase You have high emotional intelligence and enjoy consultancy-style client engagement … flexible working, gym/streaming subsidies The opportunity to work on AI projects that matter Ready to lead the future of AI-Driven digital products? If you are a Principal or senior engineer looking for a role where you can blend strategic thinking, client consultancy, and hands-on engineering this is it. Please apply now or contact James More ❯
PrincipalSoftwareEngineer & Tech Lead Leeds HQ (Flexible, Hybrid working) AI-Driven Solutions & Digital Transformation Are you a Principal-level engineer who wants to shape the future of AI-enabled digital products? WRK digital is partnering with Parallax a digital transformation consultancy pushing the boundaries of what AI can do for enterprise clients to find … should apply if: You have demonstrable experience building or delivering AI-enabled products You are an expert in Next.js (or similar), React, and AWS with a deep understanding of software architecture You balance technical leadership with hands-on codingyou are comfortable in both the boardroom and the codebase You have high emotional intelligence and enjoy consultancy-style client engagement … flexible working, gym/streaming subsidies The opportunity to work on AI projects that matter Ready to lead the future of AI-Driven digital products? If you are a Principal or senior engineer looking for a role where you can blend strategic thinking, client consultancy, and hands-on engineering this is it. Please apply now or contact James More ❯
Leeds, England, United Kingdom Hybrid / WFH Options
WRK digital
PrincipalSoftwareEngineer & Tech Lead 📍 Leeds HQ (Flexible, Hybrid working) 💡AI-Driven Solutions & Digital Transformation Are you a Principal-level engineer who wants to shape the future of AI-enabled digital products? WRK digital is partnering with Parallax — a digital transformation consultancy pushing the boundaries of what AI can do for enterprise clients — to find … should apply if: • You have demonstrable experience building or delivering AI-enabled products • You are an expert in Next.js (or similar), React, and AWS with a deep understanding of software architecture • You balance technical leadership with hands-on coding—you are comfortable in both the boardroom and the codebase • You have high emotional intelligence and enjoy consultancy-style client … flexible working, gym/streaming subsidies • The opportunity to work on AI projects that matter Ready to lead the future of AI-Driven digital products? If you are a Principal or senior engineer looking for a role where you can blend strategic thinking, client consultancy, and hands-on engineering — this is it. Please apply now or contact James More ❯
bradford, yorkshire and the humber, united kingdom Hybrid / WFH Options
WRK digital
PrincipalSoftwareEngineer & Tech Lead 📍 Leeds HQ (Flexible, Hybrid working) 💡AI-Driven Solutions & Digital Transformation Are you a Principal-level engineer who wants to shape the future of AI-enabled digital products? WRK digital is partnering with Parallax — a digital transformation consultancy pushing the boundaries of what AI can do for enterprise clients — to find … should apply if: • You have demonstrable experience building or delivering AI-enabled products • You are an expert in Next.js (or similar), React, and AWS with a deep understanding of software architecture • You balance technical leadership with hands-on coding—you are comfortable in both the boardroom and the codebase • You have high emotional intelligence and enjoy consultancy-style client … flexible working, gym/streaming subsidies • The opportunity to work on AI projects that matter Ready to lead the future of AI-Driven digital products? If you are a Principal or senior engineer looking for a role where you can blend strategic thinking, client consultancy, and hands-on engineering — this is it. Please apply now or contact James More ❯
Reading, England, United Kingdom Hybrid / WFH Options
Innovate
Role: PrincipalSoftwareEngineer Location: Berkshire Industry: Intelligence, Defence Job Type: Permanent, Onsite Salary: Competitive + Allowance + Bonus + Benefits Join a cutting edge engineering team developing high-performance embedded and application software for complex systems in the Intelligence/Cyber world. As a Lead SoftwareEngineer, you’ll provide technical leadership across … the full software lifecycle from requirements and architecture through to design, implementation, and test. Key Responsibilities: Lead and contribute to software design, development, and verification for embedded and application systems. Define architectures, review code, and ensure delivery to quality, cost, and schedule. Apply modern engineering practices (CI/CD, DevSecOps, TDD/BDD). Mentor junior engineers and … About You: Degree (or equivalent) in Engineering, Computer Science, or related field. Strong experience in C/C++ and embedded or Linux development. Skilled in object-oriented design and software lifecycle management. Familiar with real-time systems, testing frameworks, and modern development tools. What’s on offer: Competitive salary, bonus & allowance. Strong pension and flexible benefits. Hybrid working and More ❯
lisburn, antrim, united kingdom Hybrid / WFH Options
Ocho
Principal .Net Engineer – 50/50 Hands-on About the Company: My client is a global leader in market infrastructure. With a focus on data solutions, and digital transformation, they are a World leader in their market. About the Role: My Client is seeking a PrincipalSoftwareEngineer with a strong background in .NET Core … help design and build distributed systems and APIs, while mentoring others and promoting best practices in engineering delivery. Responsibilities: Design, build and maintain robust, scalable applications and services Ensure software meets business needs, aligns with technical strategy, and is delivered to a high standard Work closely with architects and product teams to refine requirements and deliver solutions Contribute to More ❯
newtownabbey, antrim, united kingdom Hybrid / WFH Options
Ocho
Principal .Net Engineer – 50/50 Hands-on About the Company: My client is a global leader in market infrastructure. With a focus on data solutions, and digital transformation, they are a World leader in their market. About the Role: My Client is seeking a PrincipalSoftwareEngineer with a strong background in .NET Core … help design and build distributed systems and APIs, while mentoring others and promoting best practices in engineering delivery. Responsibilities: Design, build and maintain robust, scalable applications and services Ensure software meets business needs, aligns with technical strategy, and is delivered to a high standard Work closely with architects and product teams to refine requirements and deliver solutions Contribute to More ❯
Belfast, Northern Ireland, United Kingdom Hybrid / WFH Options
Ocho
Principal .Net Engineer – 50/50 Hands-on About the Company: My client is a global leader in market infrastructure. With a focus on data solutions, and digital transformation, they are a World leader in their market. About the Role: My Client is seeking a PrincipalSoftwareEngineer with a strong background in .NET Core … help design and build distributed systems and APIs, while mentoring others and promoting best practices in engineering delivery. Responsibilities: Design, build and maintain robust, scalable applications and services Ensure software meets business needs, aligns with technical strategy, and is delivered to a high standard Work closely with architects and product teams to refine requirements and deliver solutions Contribute to More ❯
About Us: OpenSolar was founded in 2017 by global pioneers in solar software - Andrew Birch and Adam Pryor. OpenSolar exists to accelerate the adoption of solar and renewable energy globally. We provide the world's clean energy professionals with an end-to-end digital design, sales and management software to grow their businesses, free of charge. OpenSolar is … be part of the clean energy movement, creating a lasting impact on the world. All while being part of a passionate, fun, and highly collaborative team. The Role: The PrincipalSoftwareEngineer (Full Stack) role is a full-time permanent position located in the United Kingdom and is a remote working role. You will have the opportunity … to be part of a global high-performing dynamic software team, doing what you do best. The role is focused on designing and building the best solutions for our users in over 185 countries, whilst maintaining best practices in software development. Your key responsibilities: Design and implement robust, scalable, and secure full-stack solutions using React/Python More ❯
Bristol, Avon, South West, United Kingdom Hybrid / WFH Options
Platform Recruitment Limited
Bristol Principal Embedded SoftwareEngineer - £80k + great benefits! My client is a leading engineering firm, developing software and hardware for a range of regulated industries. They are looking for a Principal Embedded SoftwareEngineer to join their highly motivated team. This is a very interesting opportunity providing the right candidate the opportunity … Tech Stack/Skills required : -Embedded C -RTOS or MCU experience - Regulated industry experience - Team leadership experience you will be able to mentor and lead a team of embedded software engineers. The competitive salary is between £70-80k + great benefits! If youre interested please apply below More ❯
PrincipalSoftwareEngineer Join a once in a career opportunity to help build a premium private bank from the ground up. Which is currently in stealth mode , backed by significant capital and led by a visionary team. With mobilisation underway, we’re assembling a lean, elite engineering team to architect and deliver a secure, scalable, multi-cloud … banking platform using modern technologies. This is a career-defining role for a polyglot engineer with deep expertise in Rust and Python , and a passion for building robust systems in highly regulated environments. What You’ll Do Design and build core banking services and infrastructure using Rust , Python , and other modern languages. Develop secure, scalable systems across AWS and More ❯
City of London, London, United Kingdom Hybrid / WFH Options
Opus Recruitment Solutions
PrincipalSoftwareEngineer Join a once in a career opportunity to help build a premium private bank from the ground up. Which is currently in stealth mode , backed by significant capital and led by a visionary team. With mobilisation underway, we’re assembling a lean, elite engineering team to architect and deliver a secure, scalable, multi-cloud … banking platform using modern technologies. This is a career-defining role for a polyglot engineer with deep expertise in Rust and Python , and a passion for building robust systems in highly regulated environments. What You’ll Do Design and build core banking services and infrastructure using Rust , Python , and other modern languages. Develop secure, scalable systems across AWS and More ❯
Birmingham, West Midlands, United Kingdom Hybrid / WFH Options
TAE Power Solutions Engineering Ltd
Principal Control SoftwareEngineer Hybrid/Onsite to Birmingham About Us At TAE Power Solutions, we design power management systems that use less but do more. From, electric vehicle, drivetrains, ultrafast charging, stationary energy storage and grid efficiencies. We develop a clean energy ecosystem of proprietary technology designed to go faster, perform stronger, travel farther, and last … clean energy to the grid. Job Overview As a member of the Control Systems team, you will be working on the development of BMS, DCDC, OBC and Inverter application software for a range of demonstrator and production projects. You will be involved in all stages of the software development process, guide, and mentor other more junior engineers within … projects, and liaise directly with customers, suppliers, and other engineering teams within TAE Power Solutions (TPS). Key Aspects of the role Provide technical delivery and leadership of application software activities Support and mentor other more junior engineers within the team Creation and management of software requirements Take active part in the architectural design of the softwareMore ❯
Bicester, Oxfordshire, South East, United Kingdom Hybrid / WFH Options
Gerrell & Hard
Lead SoftwareEngineer IoT & Full-Stack Location: Hybrid/Bicester Type: Permanent Salary: Competitive, market-based TUAL Technology is an innovative, VC-backed start-up based in Bicester, developing PowerUp a high-power EV charging solution designed for grid-constrained sites. By integrating battery storage, smart energy management, and ultra-fast DC charging, TUAL delivers seamless electrification where … traditional grid capacity falls short. Working with enterprise customers across Europe, TUAL is transforming the productivity and profitability of electric commercial vehicle fleets through a portfolio of intelligent, software-defined, cloud and IoT-enabled charging solutions. The Role Were looking for a hands-on Lead SoftwareEngineer to own the design and delivery of our IoT and … cloud software platform. Youll connect our ultra-fast chargers, manage data and remote control functions, and ensure security and scalability across our systems. Youll work directly with the VP Product and VP Power Electronics, shaping architecture, integrations and performance turning ideas into real, working solutions. ________________________________________ What Youll Do Build IoT and cloud software for charger connectivity and monitoring More ❯
endicott, new york, united states Hybrid / WFH Options
BAE Systems
and Avionics Solutions (CAS) team. This is a unique chance to speak directly with team members, and to learn more about our work in Aircraft Engine Controls and the Software Engineering opportunities that we have available. To reserve your spot, simply apply now. We can't wait to hear from you! These positions will be located at one of … hybrid work environment and 9/80 work schedule. Our company is part of the community and driven to improve our future and protect our freedom. We are hiring software engineers at the individual contributor, team lead, and chief engineer levels to participate in Electronic Systems development programs at any of the locations listed above. As a SoftwareEngineer, you will be a member of a cross-functional, multi-disciplinary team to model, design, develop, integrate, debug, test, field, and support our innovative Electronic Systems. Required Education, Experience, & Skills Bachelor’s degree in software engineering or a related engineering discipline with 6+ years of relevant Software Engineering experience in avionics or electronic controls embedded More ❯
Reading, England, United Kingdom Hybrid / WFH Options
eflow Global
strategic shift to a fully SaaS model, we’re entering an exciting phase of rapid expansion and innovation. About the Role We’re looking for a motivated and experienced SoftwareEngineer to join our growing team. You’ll be involved in designing, developing, and maintaining cutting-edge software solutions in a collaborative and forward-thinking environment. This … role offers the opportunity to work across both front-end and back-end development using modern technologies to build high-quality applications. Key Responsibilities Develop and maintain scalable software solutions using languages such as Java, C++, or Python. Build responsive user interfaces with HTML, CSS, JavaScript, and frameworks like React or Angular. Design and implement RESTful APIs and integrate … designers, and fellow developers to deliver innovative solutions. Participate in code reviews and mentor junior team members. Troubleshoot and resolve complex technical issues. Stay current with emerging trends in software engineering and apply them to projects. Propose technical improvements and champion best practices. Qualifications Bachelor’s degree in Computer Science, Software Engineering, or a related field—or equivalent More ❯
slough, south east england, united kingdom Hybrid / WFH Options
eflow Global
strategic shift to a fully SaaS model, we’re entering an exciting phase of rapid expansion and innovation. About the Role We’re looking for a motivated and experienced SoftwareEngineer to join our growing team. You’ll be involved in designing, developing, and maintaining cutting-edge software solutions in a collaborative and forward-thinking environment. This … role offers the opportunity to work across both front-end and back-end development using modern technologies to build high-quality applications. Key Responsibilities Develop and maintain scalable software solutions using languages such as Java, C++, or Python. Build responsive user interfaces with HTML, CSS, JavaScript, and frameworks like React or Angular. Design and implement RESTful APIs and integrate … designers, and fellow developers to deliver innovative solutions. Participate in code reviews and mentor junior team members. Troubleshoot and resolve complex technical issues. Stay current with emerging trends in software engineering and apply them to projects. Propose technical improvements and champion best practices. Qualifications Bachelor’s degree in Computer Science, Software Engineering, or a related field—or equivalent More ❯
Bicester, Oxfordshire, United Kingdom Hybrid / WFH Options
Gerrell & Hard
Lead SoftwareEngineer IoT & Full-Stack Location: Hybrid/Bicester Type: Permanent Salary: Competitive, market-based TUAL Technology is an innovative, VC-backed start-up based in Bicester, developing PowerUp a high-power EV charging solution designed for grid-constrained sites. By integrating battery storage, smart energy management, and ultra-fast DC charging, TUAL delivers seamless electrificatio click More ❯
