601 Principal Developer jobs in the United Kingdom

Principal Developer (C# and Azure Development)

Division: IT

Job type: Principal Developer

Location: Manchester, UK

About Our Client

Founded in 1988, our client set out with an ambitious visionto become the worlds leading specialist in travel management. Built on the belief that travel is one of lifes most powerful and emotive experiences, our client is driven by a single mission: to make every journey exc.

WHJS1_UKTJ

Principal Backend Developer (C# / .NET / Playwright)

The Opportunity

This is a career-defining role for a Principal Backend Developer who wants to be at the forefront of a growing SaaS organisation. You'll be joining a company that's scaling rapidly, building innovative products that make a real difference to its customers. This role offers the chance to take ownership of backend systems, shape best practice, and mentor the next generation of engineers.

The Role

You'll provide technical leadership across backend development, ensuring systems are robust, scalable, and future-proof. Working closely with product owners, testers, and front-end teams, you'll bring engineering excellence into every decision. With a stack centred on C#, .NET, cloud services, and automation frameworks, you'll be both hands-on in coding and guiding others to deliver their best work.

Day-to-day responsibilities

• Architect and build scalable backend services in C# / .NET
• Drive adoption of clean coding practices, design patterns, and SOLID principles
• Mentor engineers, fostering a culture of growth, learning, and high performance
• Collaborate with product owners to refine requirements and translate them into technical solutions
• Integrate automation testing (Playwright) and CI/CD pipelines to ensure code quality
• Lead technical discussions, setting direction on tools, frameworks, and approaches
• Troubleshoot and resolve complex technical challenges across backend services
• Optimise system performance and ensure resilience across platforms
• Review code and guide engineering standards across the team
• Contribute to product strategy by aligning technical roadmaps with business goals

What you bring to the team

• Strong experience developing backend systems with C# and .NET
• Deep knowledge of cloud environments (Azure preferred)
• Experience in designing APIs and microservices at scale
• Solid understanding of automation testing tools (Playwright desirable)
• Leadership experience - mentoring, coaching, and guiding engineering teams
• Strong problem-solving skills with an eye for performance optimisation
• Enthusiasm for delivering quality solutions in a SaaS environment

Send your CV now to (url removed)

50249MS

INDMANS

Principal Backend Developer (C# / .NET / Playwright)

The Opportunity

This is a career-defining role for a Principal Backend Developer who wants to be at the forefront of a growing SaaS organisation. You'll be joining a company that's scaling rapidly, building innovative products that make a real difference to its customers. This role offers the chance to take ownership of backend systems, shape best practice, and mentor the next generation of engineers.

The Role

You'll provide technical leadership across backend development, ensuring systems are robust, scalable, and future-proof. Working closely with product owners, testers, and front-end teams, you'll bring engineering excellence into every decision. With a stack centred on C#, .NET, cloud services, and automation frameworks, you'll be both hands-on in coding and guiding others to deliver their best work.

Day-to-day responsibilities

• Architect and build scalable backend services in C# / .NET
• Drive adoption of clean coding practices, design patterns, and SOLID principles
• Mentor engineers, fostering a culture of growth, learning, and high performance
• Collaborate with product owners to refine requirements and translate them into technical solutions
• Integrate automation testing (Playwright) and CI/CD pipelines to ensure code quality
• Lead technical discussions, setting direction on tools, frameworks, and approaches
• Troubleshoot and resolve complex technical challenges across backend services
• Optimise system performance and ensure resilience across platforms
• Review code and guide engineering standards across the team
• Contribute to product strategy by aligning technical roadmaps with business goals

What you bring to the team

• Strong experience developing backend systems with C# and .NET
• Deep knowledge of cloud environments (Azure preferred)
• Experience in designing APIs and microservices at scale
• Solid understanding of automation testing tools (Playwright desirable)
• Leadership experience - mentoring, coaching, and guiding engineering teams
• Strong problem-solving skills with an eye for performance optimisation
• Enthusiasm for delivering quality solutions in a SaaS environment

Send your CV now to (url removed)

50249MS

INDMANS

A leading UK defence organisation are seeking an experienced Principal Appian Developer to join their team to be based at either their Bristol or Leicester site (hybrid working). This is a new permanent role with a salary banding up to £80,000 along with an excellent benefits package.

This role is full time, 35 hours per week and provides hybrid working arrangements with 2 days in either office and 3 days working from home.

Security Clearance

The successful candidate must be a sole UK citizen who is able to achieve and maintain Security Check (SC) security clearance for this role.

The Role

As a highly skilled and experienced Principal Appian Developer, you’ll have a role that’s out of the ordinary. You'll lead team of dedicated developers to ensure that you and the team deliver technical solutions for customers on time and to the expected quality standard provided by the Systems Development Manager.

Day-to-day, you’ll be required to work with multiple workflow applications (new and current software) as you undertake requirements reviews, technical design, modelling, software development, unit testing and deployment of new applications as well as continual improvement to existing applications:

• Leadership: Guide and mentor a team of developers, ensuring the delivery of high-quality technical solutions.
• Development: Work with multiple workflow applications (new and existing) to undertake requirements reviews, technical design, modeling, software development, unit testing, and deployment of new applications.
• Continuous Improvement: Enhance existing applications through continual improvement processes.
• Quality Assurance: Ensure software development adheres to IT quality plans and procedures.
• Collaboration: Attend workshops, reviews, and stand-ups to discuss development projects, demonstrate progress, and communicate with stakeholders.
• Documentation: Prepare comprehensive documentation to support completed applications.

Essential Experience of the Principal Appian Developer:

• Substantial amount of proven development experience.
• Demonstratable knowledge of Software Development Life Cycles (SDLC).
• Knowledge of waterfall, iterative and agile approaches to software delivery.
• Extensive experience working with BPM software applications like Appian as well as other development tools such as IDEs and source code management.
• Modelling and representation system of business process design utilising UML and BPMN techniques.

Qualifications for the Principal Appian Developer:

We value difference and don’t have a fixed idea when it comes to background or education, provided you can show the required level of experience and / or willingness to learn then we would like to hear from you.

We are looking for Principal Frontend Developers (we call them Software Craftspeople) who share the same values of pragmatism, professionalism and transparency that we do. We are not your typical consultancy! We believe in having a great work/life balance so we won’t be asking you to travel all over the place! Any travel would be restricted to your main office branch (London). Any client work that is outside of these locations would be undertaken remotely.

We support our clients in many ways and you will have the opportunity to work on a wide range of different internal and client projects. Perhaps you’ll work on a client project from our offices with our team delivery approach. This may be a greenfield project for a startup, or helping to build a mission-critical system for a large enterprise client. Perhaps you’ll work as an embedded craftsperson, working within our client's existing development to help them to get better at writing their own software. Or maybe you're more interested in helping to introduce the values of Craftsmanship to an organisation through coaching & mentoring.

Location: London. Please note that we are not able to offer visa sponsorship at this time.

What about you?

You consider yourself a Software Craftsperson. For you, writing code is part of your job and also a source of joy. Test-Driven Development is how you like to or would prefer to write code - preferring to work in small increments, trying things out and iterating rapidly, tightening the feedback loop as much as possible, and letting your tests drive the design of the code.

You are a team player. You understand that software lives on long after it is first delivered and that many different people will contribute to it over its lifetime.

As a curious developer, you spend time investing in your craft, learning new technologies and practicing different techniques and approaches.

Requirements

What about you?

As someone performing this role, these are some of the things we are looking for:

• Client Engagement: You are able to actively build relationships with strategic stakeholders within the client, acting as an advisor and partner in helping them identify and solve problems. You are good at helping people come up with a vision and helping them get aligned behind it.
• Broad technical knowledge and skills: You are able to advise on multiple technology stacks at both high and low levels. You can even help a product team with value discovery through prototyping, research, and are able to quickly gain a deeper understanding of the business domain. (We mainly work with the React, Angular, or Vue.js, alongside cloud technologies).
• Project Management: You have a proven track record of executing and planning a technical or product strategy, and identifying and managing risks.
• Communication and Leadership: Versatility in leadership and communication styles is key for a role like this. Facilitation skills are a key part of this job.

It would be an added bonus if you:

• Actively participate in a technical community.

• Have experience of working in a software consultancy, or have been part of implementing some kind of organisational transformation (Agile, Lean, Digital).

• Have a deep understanding of software development best practices, working with legacy code, re-architecture, cloud technologies, software design, etc.

Benefits

• Personal learning budget - access to Learnerbly, our online learning and development tool, to support your personal development and career progression here
• Training - no fixed training budget. So long as the course is relevant for the company and you’ll do a lightning talk on the subject, we’re happy to pay for it
• Life cover and private medical - Long term sickness cover. Private medical cover including dental, hearing and optical
• Long service awards - two additional days of holiday when you enter your third year (on top of 25 days), two additional days after five years, two additional days after eight years (31 days in total) and a month fully paid sabbatical after ten years of service
• Pension (4% top-up) and income protection - Option to choose from an employer pension top-up to 5% or a holiday voucher for the value of £1000 after 5 years of service. 8% pension top-up or a holiday voucher for the value of £2000 after 8 years of service
• Employee assistance program (EAP) including access to well-being support (counselling, therapy)
• Enhanced parental leave
• Electric car and cycle to work scheme

Everyone should have the right to bring their whole self to work and be celebrated for who they are. Our people are hired purely on their commitment to these values and their ambition to deliver outstanding results for our clients. Codurance is proud to be an Equal Opportunities Employer and is committed to fostering an inclusive workplace.

• Architect, design, and implement robust, scalable, and high-performance frontend solutions using modern JavaScript frameworks (e.g., React, Vue, Angular).
• Lead code reviews, provide technical guidance, and mentor junior and mid-level frontend developers.
• Define and enforce coding standards, best practices, and architectural patterns for the frontend team.
• Collaborate closely with product managers, UX/UI designers, and backend engineers to translate requirements into high-quality user interfaces.
• Optimize applications for maximum speed, scalability, and responsiveness across various devices and browsers.
• Identify and address performance bottlenecks and technical debt.
• Stay ahead of emerging frontend technologies and trends, evaluating and recommending new tools and libraries.
• Contribute to the technical roadmap and strategy for the frontend codebase.
• Champion a culture of quality, innovation, and continuous improvement within the engineering team.
• Troubleshoot and resolve complex frontend issues.

• Bachelor's degree in Computer Science, Engineering, or a related field, or equivalent practical experience.
• A minimum of 8 years of professional experience in frontend development, with a significant focus on complex web applications and SaaS products.
• Deep expertise in JavaScript (ES6+), HTML5, CSS3, and modern frontend frameworks (React, Vue, or Angular).
• Proven experience in architecting and leading frontend development efforts.
• Strong understanding of state management, API integration, and build tools (e.g., Webpack, Babel).
• Experience with performance optimization techniques and cross-browser compatibility.
• Familiarity with backend technologies and cloud platforms (e.g., AWS, Azure) is a plus.
• Excellent problem-solving, analytical, and debugging skills.
• Strong leadership, communication, and collaboration abilities, essential for a remote role.
• A passion for building exceptional user experiences.