Junior Software Developer

Location: Cardiff (Office-based, 5 days a week)

Salary: £32,000 to £37,000 DOE + bonus

Closing Date: 26th February 2026

Start Date: Spring 2026

Ready to kickstart your career in software development? If you've got the basics of .NET under your belt and are eager to learn from experienced developers, we'll help you build the skills to become a confident and capable professional. With a clear pathway to becoming a Senior Developer, this is the opportunity to grow, be mentored, and shape your future in tech.

At Advanced Secure Technologies, we’re a fast‑growing, innovative company on a mission to protect organisations from document fraud through cutting‑edge security solutions. Based on site in St Mellons, Cardiff, we’re expanding and need another skilled developer to help us scale. You’ll work alongside experienced developers, gaining the mentoring and exposure needed to reach your next career milestone.

• Develop and enhance our secure web applications using .NET 8
• Apply best practices to write clean, maintainable, testable code
• Collaborate with talented developers, learning from seniors while taking on more complex challenges
• Share ideas, solve problems, and help shape the future of our products

1+ years’ commercial experience in modern C# .NET development.

Strong problem‑solving skills, attention to detail, and great communication.

• Exposure to enterprise‑scale software, microservices or SaaS product development
• Knowledge of unit/integration testing, .NET Aspire, Blazor, REST APIs, EF Core, SQL, Redis, Elasticsearch, Rabbit
  
  MQ, Docker or Blockchain
• Familiarity with SOLID principles, Clean Architecture, general software architecture concepts, DDD, and secure coding/OWASP practices
• Experience with Azure Dev Ops and CI/CD pipelines

What We Offer:

• Competitive salary £32,000-£37,000 (DOE) +
• Monthly performance related bonus starting at £150 following induction
• A clear career pathway to Developer and then Senior Developer and further beyond, with mentoring and skill development support
• 25 days holiday + Bank Holidays
• Additional holiday gifted for exceptional dedication and performance.
• Training and development time, plus training budgets for courses/exams
• Free gym, free eyecare, and a fully stocked kitchen
• Company car and cycle-to-work schemes
• A fun, supportive culture with birthday treats and epic office events

Onsite, Eastern Business Park, St Mellons, Cardiff, Wales.

Min Hours 37.5hrs per week, 8.30am to 5pm Monday to Friday, with up to one hour for lunch.

If you're ready to accelerate your development career, gain hands‑on experience with the latest Microsoft technologies, and work towards becoming a Senior Developer,
apply now - we can’t wait to see what you’ll bring!

We’re an office‑based team because our culture thrives on collaboration and hands‑on support, especially as we grow quickly and onboard new team members. While we don’t offer fully remote or fixed hybrid work, we’re flexible when life happens.

The facility has secure onsite parking options and adjacent bus stops.

Advanced Secure Technologies is an equal opportunity employer, proud of our ongoing efforts to foster diversity and inclusion. We welcome applicants from all backgrounds and process your personal data in accordance with our Privacy Notice.