Senior Developer

Stealth AI Company; Greater London; On-site; GBP 70,000 - 110,000; Full time

Job summary

Stealth AI Company in Greater London is seeking a Senior Developer to join SAL and shape the future of our products. You’ll work with our Head of Development to design and build the next generation of our platform while continuing to enhance and support our existing software, including our Windows desktop application and web-based financial modelling platform.

We are modernising our software solutions, so your ideas, experience, and technical expertise will have a real impact.

Qualifications

• Proficiency in C# and the .NET stack for desktop and web platforms.
• Experience delivering maintainable software with modern architectures.
• Strong knowledge of SQL Server and ORM frameworks.

Responsibilities

• Maintain and enhance existing software platforms.
• Collaborate with Head of Development on next-gen product design.
• Contribute to architectural discussions and technical decisions.
• Research and adopt new technologies where appropriate.
• Produce and maintain technical documentation.
• Share knowledge and support team members.
• Continuously improve products, processes, and engineering practices.

Skills

C#

ASP.NET Core

WPF

MVVM

RESTful APIs

SQL Server

Entity Framework Core

Azure DevOps

Azure

Security / Cybersecurity

Unit Testing

System Design

Job description

About The Role

• We're looking for a Senior Developer to join SAL and help shape the future of our products.
• You’ll work closely with our Head of Development to design and build the next generation of our platform while continuing to enhance and support our existing software, including our Windows desktop application and web-based financial modelling platform.
• We’re currently modernising our software solutions, so your ideas, experience, and technical expertise will have a real impact. You’ll play an important role not only in development, but also in influencing architecture, technical direction, and engineering standards.
• We’re a small team, which means everyone has a voice. Communication is just as important as technical ability. Writing great code is only part of the role, you’ll also need to collaborate effectively, explain technical decisions clearly, and work closely with colleagues across the business.
• We work in an agile environment, but we’re pragmatic rather than process-driven. We care about delivering value, solving real problems, and continuously improving how we work.

Responsibilities

• Maintain and enhance our existing software platforms.
• Work closely with the Head of Development to design and build our next-generation products.
• Contribute to architectural discussions and technical decision‑making.
• Research, evaluate, and introduce new technologies where appropriate.
• Produce and maintain technical documentation.
• Share knowledge and support other members of the team.
• Continuously look for ways to improve our products, processes, and engineering practices.

Who You Are

We're looking for someone who is not only technically strong but also enjoys working with people.

You Are

• A clear and open communicator who enjoys collaborating and keeping others informed.
• Empathetic and customer-focused, always considering how your work improves the experience for the people using our products.
• Thoughtful and considerate of your teammates, leaving code and systems in a better state than you found them.
• Someone who naturally supports others and is happy to share knowledge.
• Comfortable making mistakes and viewing them as opportunities to learn and improve.
• Curious and willing to challenge existing approaches respectfully when you believe there's a better solution.
• Detail‑oriented, understanding that the small things often make the biggest difference.
• Passionate about learning and continuously developing your skills.
• You recognise that AI has fundamentally changed the software development landscape, and you embrace the opportunity to use AI responsibly to help us build better software, faster, without compromising quality or maintainability.

Essential

Technical Requirements

• C#
• ASP.NET Core (.NET 8/9/10)
• WPF and MVVM
• RESTful APIs
• SQL Server and Entity Framework Core
• OpenID Connect, OAuth 2.0 and Role-Based Access Control (RBAC)
• Multithreading and concurrent programming
• Unit and integration testing
• System design and software architecture
• Azure DevOps CI/CD Pipelines
• Experience with Azure or similar cloud platforms
• Experience building secure applications
• A good understanding of cybersecurity principles

Nice to Have

• JavaScript
• Experience with modern JavaScript frameworks such as React, Vue or Angular
• An appreciation for user experience (UX) and usability
• Experience using AI‑assisted development tools such as Codex and Claude
• Experience designing AI‑powered development workflows and effective prompt engineering

By submitting this application, I agree that my personal data will be collected, processed, and retained by the company solely for the purposes of managing and assessing my candidacy.