At a Glance
- Tasks: Develop and enhance secure web applications using cutting-edge .NET technologies.
- Company: Join Advanced Secure Technologies, a fast-growing company on a mission to combat document fraud.
- Benefits: Enjoy a competitive salary, performance bonuses, and a fun, supportive culture.
- Other info: Great career growth opportunities and a dynamic team environment.
- Why this job: Shape the future of enterprise applications and work with innovative tech.
- Qualifications: 7+ years in C# .NET development and strong problem-solving skills required.
The predicted salary is between 57250 - 66275 £ per year.
Location: Cardiff (Office-based, 5 days a week)
Salary: £57,250 - £66,275 base (DOE) + up to £3,000 annual bonus
Start Date: Early 2026
Job Overview: Are you an accomplished Senior Software Developer with a proven track record in .NET? Join us at an exciting time in our journey, where you'll help shape the future of our products as we modernise our enterprise applications with cutting-edge .NET technologies and event-driven SaaS microservice architecture to deliver enterprise-scale solutions. 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.
What You'll Do:
- Develop and enhance our secure web applications using .NET
- Apply best practices to write clean, maintainable, testable code
- Collaborate with other talented developers, taking on complex challenges
- Share ideas, solve problems, and help shape the future of our products
Requirements:
- 7+ years' commercial experience in modern C# .NET development, including time at senior level.
- Proven ability in maintaining high testing standards (unit and integration tests)
- Some experience of Clean Architecture, or similar (hexagon/onion etc) beyond traditional N-tier designs
- Strong problem-solving skills, attention to detail, and excellent communication
- Ability to mentor, guide and lead other developers, influencing technical direction and best practices
Bonus Points:
- Working with enterprise-scale software, microservices, event-driven architecture or SaaS product development
- Experience with some of the tech we use: .NET Blazor, EF Core, SQL, Redis, Elasticsearch, RabbitMQ, Docker, Kubernetes or Blockchain
- Experience with TDD, DDD, secure coding/OWASP practices, Azure DevOps, CI/CD pipelines and cloud platforms like Azure
Benefits:
- Competitive salary £57,250 - £66,275 (DOE) + monthly performance bonus
- A clear career pathway through our Senior Developer grades and beyond, with mentoring and skill development support
- 25 days holiday + Bank Holidays
- Training and development time, plus training budgets for courses/exams
- Free gym, secure parking, free eyecare, and a fully stocked kitchen
- Access to PerkBox significant retailer discounts
- Free private online GP
- Employee Assistance Programme including specialist clinical support
- Company car and cycle-to-work schemes
- A fun, supportive culture with birthday treats and epic office events
Selection Process:
- Introductory call (45m): A chance for us to get to know you, and for you to get to know us. We’ll cover your experience, a few competency-based questions, and some light technical discussion
- Technical assessment (90m): Technical questions and discussion around your approach and problem-solving, includes a 30-minute practical coding exercise
- Final conversation (20m): Meet our Managing Director for an informal chat about the role, the team, and your potential impact
Location and 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 - ad hoc home working is always an option.
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.
Senior Software Developer in Cardiff employer: Advanced Secure Technologies
Advanced Secure Technologies is an exceptional employer, offering a dynamic work culture in Cardiff that prioritises employee development and growth. With a comprehensive 90-day training programme and ongoing coaching, you will gain invaluable skills while contributing to innovative tech solutions for the education sector, paving the way for a rewarding career path within a rapidly expanding company.
Contact Details:
Advanced Secure Technologies Recruitment Team
StudySmarter Expert Advice🤫
We think this is how you could land Senior Software Developer in Cardiff
✨Join Local Tech Meetups
Get out there and mingle with fellow developers by joining local tech meetups. It’s a fantastic way to meet people who might be working at Advanced Secure Technologies or know someone who does. Plus, you can pick up some trendy tech skills and trends while you're at it!
✨Contribute to Open Source Projects
Show off your coding chops by jumping into open-source projects. Not only does this give you practical experience, but it also gets you noticed in the dev community. You'll create a killer portfolio that speaks volumes about your skills to Advanced Secure Technologies.
✨Tap into Online Developer Communities
Don’t underestimate the power of online developer communities like GitHub, Stack Overflow, and even Reddit. Participate in discussions, share your projects, and build your visibility. We can often find opportunities through these channels that can lead to a full-time gig at companies like Advanced Secure Technologies.
✨Explore Job Boards Specifically for Tech Roles
Keep your eyes peeled on job boards that focus on tech roles. Sites like TechCareers or Stack Overflow Jobs can often have listings for companies like Advanced Secure Technologies that might not show up on broader job sites. Make it a habit to check these regularly, and don’t hesitate to apply directly through our website!
We think you need these skills to ace Senior Software Developer in Cardiff
Some tips for your application 🫡
Show off your coding skills:When applying for a software engineering role, it's super important to showcase your coding skills. Make sure your CV includes your tech stack, any relevant programming languages you’re comfortable with, and examples of projects you've worked on. If you have a GitHub profile, link it up! We love to see code in action.
Tailor your portfolio:For a full-time role, we’d expect to see some solid examples of your work in your portfolio. Make sure to include at least two or three projects that highlight your problem-solving skills and your ability to work with different technologies. Focus on the projects that are most relevant to the position at Advanced Secure Technologies.
Craft a killer cover letter:Your cover letter is your chance to stand out—make it personal! Explain why you want to work at Advanced Secure Technologies and how your skills align with the role. Show us your passion for software development. We dig enthusiastic candidates who understand the value of collaboration and continuous learning!
Be clear and concise:When it comes to writing your CV and cover letter, clarity is key. Avoid jargon that could confuse us and stick to simple, direct language. Highlight your achievements with quantifiable results where possible, and keep everything easy to read. A well-organised application goes a long way!
How to prepare for a job interview at Advanced Secure Technologies
✨Brush Up on Your Coding Skills
For a full-time software engineering role, it's crucial that we stay sharp with our coding abilities. Expect technical questions that might involve solving problems on the spot or discussing algorithms. Practise on platforms like LeetCode or HackerRank to get comfortable with the types of questions that often come up.
✨Know Your Tools and Frameworks
Make sure we’re well-acquainted with the tools and technologies listed in the job description. Familiarise ourselves with any specific frameworks or programming languages mentioned. If Advanced Secure Technologies uses React or Node.js, for instance, be ready to discuss how we’ve used them in previous projects or coursework.
✨Showcase Your Projects
Bring along a portfolio that highlights our best work. This could be code samples, GitHub repositories, or any side projects we’ve built. Make sure we can talk through our thought process for each project, especially the challenges we faced and how we solved them—this shows our problem-solving skills in action.
✨Prepare for Behavioural Questions
While technical skills are key, full-time positions also require cultural fit. Be ready to discuss our previous experiences and how we handle teamwork, conflict, and deadlines. Brush up on the STAR method—Situation, Task, Action, Result—to clearly articulate our past experiences when discussing how we've contributed to a team.
