Senior Full Stack Software Developer

Job Description

Are you interested in joining one of Europe's fastest growing companies?
Do you want to impact the wellbeing of millions of users?

If yes, join us to make an impact in a fast-paced and dynamic environment where you’ll play a key role in shaping, scaling, and delivering world-class technology solutions that help people feel valued, connected, and supported at work.

Epassi’s purpose is to boost everyday well-being. We are a leading provider of employee benefit solutions across Europe,

We are currently hiring a Senior Full Stack Software Developer (Microsoft Technologies) to be based in our office in Leatherhead, Surrey

About our technology:

Epassi is transforming the way employers engage with their people.

Our market-leading SaaS platform empowers businesses to deliver a world-class employee proposition — allowing employees to tailor their benefits package, understand their total reward, access personalised content and communications, and celebrate their colleagues’ achievements.

Our platform supports hundreds of employers, including household names like Yahoo, Hargreaves Lansdown, and Travis Perkins, to create workplaces where employees feel valued, informed, and deeply connected to their company’s success.

We’re proud to boast an impressive NPS of over 70%, a testament to our commitment to outstanding client and end-user experiences.

At Epassi, we foster a work environment that’s as friendly as it is professional, as high-performing as it is supportive. We thrive on empowerment, autonomy, and mutual success — celebrating achievements, learning openly from failures, and continuously improving together.

About the role:

As a Senior Developer at Epassi, you will play a pivotal role in shaping the architecture, design, and delivery of our flagship SaaS platform.

You’ll lead by example in coding standards, mentor junior developers, and collaborate closely with Product and Engineering leadership to drive innovation and technical excellence.

You’ll take ownership of complex features, influence technical direction, and ensure scalability, performance, and security are embedded in everything we build.

Technology Stack: Microsoft .NET 9 and up, Microsoft Azure, C#, ASP.NET Core MVC and Blazor, NUnit, Docker containers, GitHub CoPilot

What you’ll be doing:

• Lead the design and implementation of scalable, secure, and high-performance solutions
• Mentor and support junior developers through code reviews, pair programming, and knowledge sharing
• Collaborate with Product Owners to translate business requirements into technical solutions
• Contribute to architectural decisions and long-term technical strategy
• Champion best practices in DevOps and CI/CD
• Drive continuous improvement in development processes and tools
• Ensure high quality and accuracy is maintained through to software release
• Investigate, analyse, and resolve reported defects
• Help Epassi stay at the forefront of technological innovation

What we are looking for:

• Technical leadership: ability to guide and influence technical decisions across teams
• Mentorship: experience mentoring developers and fostering a culture of learning
• Strategic thinking: understands the broader business context and aligns technical decisions with strategic goals
• Problem solving: strong analytical and troubleshooting skills
• Communication: excellent verbal and written communication skills

Experience / Skills Required:

• Full stack development: 5+ years of hands-on experience with Microsoft C# and .NET technologies
• Front-end & back-end integration: demonstrated ability to seamlessly integrate front-end and back-end components
• UI/UX: knowledge of HTML, CSS, JavaScript, and responsive design; experience with front-end frameworks like Bootstrap
• Blazor/Razor/MVC: proficiency in Blazor, Razor, and MVC frameworks for building dynamic web applications
• Object-oriented development & SOLID principles: strong understanding and practical application of OOP and SOLID design principles
• Entity Framework: experience with Entity Framework for data access and management
• Containerisation: practical experience with technologies such as Docker or Kubernetes
• Experience leading development teams or technical projects
• Proven track record of delivering enterprise-grade applications
• Strong understanding of software architecture and design patterns
• Experience with performance tuning and application scaling in Azure or other cloud environments

What you bring to Epassi:

• A collaborative and proactive mindset
• Commitment to quality, scalability, and maintainability
• Passion for innovation and continuous improvement
• Ability to mentor, guide, and inspire others
• Strong sense of accountability and ownership in delivery

Why You Should Join Us:

• Be part of an ambitious growth journey and join a global community of driven, bold, entrepreneurial, yet humble Epassians in a company that is constantly evolving
• Work with a clear purpose — boosting everyday wellbeing — and create a meaningful, positive impact on both individuals and society
• Thrive in an open and inclusive culture with low hierarchy, where relationships are built on respect, camaraderie, and shared successes and challenges
• Come as you are — we’ll bring out the best in you and support your personal and professional growth
• Join a fast-growing tech company with a strong financial foundation, offering opportunities to grow and make an impact together with us
• Benefit from an inspiring and supportive work environment where employee wellbeing is a true priority
• Contribute to solidifying our position as the number one player in Europe’s employee benefit market and help shape the next wave of success

This position will be filled as soon as we identify a suitable candidate, so please do not hesitate to apply ASAP.

For more information contact [email protected]