Junior Software Developer

Advanced Secure Technologies | B Corp™; Cardiff; On-site; GBP 32,000 - 37,000; Full time

Job summary

A growing tech company in Cardiff is seeking a software developer to enhance secure web applications using .NET 8. With 1+ years of experience in C# .NET development, the ideal candidate will collaborate with senior developers, apply best coding practices, and contribute to innovative solutions. The role offers a competitive salary of £32,000-£37,000, training budgets, and a clear career pathway to senior roles. Apply now to kickstart your career and grow in a supportive environment.

Benefits

Competitive salary

Monthly performance bonus

Career pathway and mentoring

25 days holiday + Bank Holidays

Training and development budgets

Free gym and eyecare

Cycle-to-work schemes

Fun office culture

Qualifications

• 1+ years’ commercial experience in modern C# .NET development.
• Strong problem-solving skills and attention to detail.
• Excellent communication abilities.

Responsibilities

• Develop and enhance secure web applications using .NET 8.
• Apply best practices to write clean and maintainable code.
• Collaborate with experienced developers and take on complex challenges.
• Contribute ideas and help shape product futures.

Skills

C# .NET development

Problem-solving

Attention to detail

Communication

Tools

.NET 8

Azure DevOps

Docker

Job description

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.

What You’ll Do

• 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

Requirements

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

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

Bonus points for:

• 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, RabbitMQ, Docker or Blockchain
• Familiarity with SOLID principles, Clean Architecture, general software architecture concepts, DDD, and secure coding/OWASP practices
• Experience with Azure DevOps and CI/CD pipelines

Benefits

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

Location/Hours

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!

On Site Working

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.

Diversity & Inclusion

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.