Senior .NET Developer
About Us
At Flat Rock Technology, we build the future!
Whether it’s helping clients grow their teams through staff augmentation, developing software that scales businesses, protecting companies from cyber threats, or managing large operational teams as an extension of each of our wonderful customers, we’re there to empower growth and drive impact.
With offices across the Globe: UK, Europe, South America, Sri Lanka, and the US, we’re a fast-growing global tech and staff augmentation organization delivering cutting-edge software development, data services, and business process outsourcing to clients worldwide.
We believe in innovation, ownership, and growing & developing our people. Your ideas matter here and your work truly makes a difference. Whether we're engineering powerful software, optimizing operations, or helping customers scale, we move fast, stay curious, and build with purpose.
Join a team that’s collaborative, ambitious, and always pushing for better.
At Flat Rock, we don’t just follow the future - we create it.
Main responsibilities:
- Design, develop, and maintain high-performance .NET applications (C#, .NET Core / .NET 6+)
- Architect and implement AI-enhanced features, including automation, recommendations, and AI/ML service integrations (Azure AI, OpenAI, Cognitive Services)
- Build and consume RESTful APIs and event-driven services interacting with AI models
- Contribute to system architecture, scalability, and AI-readiness
- Write clean, maintainable, well-tested code following modern engineering and AI-safe practices
- Lead code reviews, testing, documentation, and AI governance
- Collaborate with cross-functional teams to translate business needs into technical and AI solutions
- Optimize application performance, reliability, security, and AI workloads
- Troubleshoot full-stack and cloud/AI integration issues
- Mentor developers and upskill teams in AI-aware development
- Stay current on .NET, cloud, and AI technologies, recommending improvements and innovations
Requirements:
- Backend & Architecture
- 5+ years of experience in .NET development using C#, ASP.NET Core, and RESTful APIs.
- Strong knowledge of software design principles, including architecture patterns, SOLID principles, and clean code practices.
- Experience with SQL Server and relational databases.
- Experience designing and developing scalable, modular applications and services.
- Strong analytical, problem-solving, and communication skills.
- Frontend Development
- 3+ years of professional experience with React and TypeScript for building modern, scalable web applications.
- Deep knowledge of JavaScript (ES6+), HTML5, and CSS3, including responsive design and modern layout techniques (Flexbox, Grid).
- Experience designing modular, reusable React components and scalable frontend architecture.
- Solid understanding of state management patterns (Redux Toolkit, Context API).
- Experience integrating RESTful APIs and implementing authentication flows (e.g., JWT).
- Familiarity with modern frontend build tools and package managers (npm/yarn, Vite/Webpack).
- Understanding of React performance optimization techniques.
- Knowledge of web security and accessibility best practices.
- Cloud, AI & Integration
- Experience with cloud platforms, preferably Microsoft Azure.
- Experience integrating AI/ML capabilities into applications (e.g., Azure OpenAI, Cognitive Services, prompt engineering, AI-assisted automation).
- Familiarity with AI/ML platforms and frameworks such as Azure ML, Semantic Kernel, LangChain, or ML.NET.
- Understanding of AI security, data privacy, and responsible AI principles.
- DevOps & Development Practices
- Experience with CI/CD pipelines, DevOps practices, and Git workflows.
- Experience working in agile development environments and cross-functional teams.
- Nice to Have
- Experience with Next.js.
- Experience with component libraries such as Material UI or Ant Design.
- Experience with end-to-end testing tools (Cypress or Playwright).
- Familiarity with design systems and collaboration tools such as Figma.
- Experience with microservices architecture.
- Experience with containerization and orchestration (Docker, Kubernetes).
- Experience building AI-driven products in product-led, innovation-focused environments.
- Experience with frontend or full-stack frameworks such as Angular or Blazor.
What we offer in return:
- Competitive salary packages plus a range of region-specific benefits
- Clear career paths and opportunities for continuous professional development
- Exciting, meaningful work within a fast-growing international organisation
- Modern office spaces across the globe
- A vibrant company culture with regular team events and social activities
- Entertainment zones, team-building programmes, and local cultural celebrations
- Hybrid working options – enjoy the flexibility of working from home and the office
- Additional holiday days added the longer you’re with Flat Rock
Privacy statement
If that sounds just like you, apply now by sending your CV in English!
By submitting your application, you agree that FRT will use your personal data for recruitment purposes only. All documents will be treated in the strictest confidentiality.
Only short-listed candidates will be invited for an interview.
We can’t wait to meet you!
Looking for your next opportunity?
What's Next
1
Application Review
Once you submit your application, our HR Team will carefully review it and determine if you're a good fit for the role.
2
First Interview
If you pass the initial screening, we'll invite you for an interview where you'll have the chance to learn more about the position and our company, and we'll get to know you better.
3
Test Task
Next, we'll ask you to complete a test task that aligns with the requirements of the role. We'll provide you with clear instructions and a deadline.
4
Final Interview
After completing the test task, you'll have a final interview with the hiring manager for us to get to know you better and answer any remaining questions you may have.
5
Job Offer
If you're the perfect candidate for the role, we'll present you with a job offer that includes exciting benefits and perks!
6
Start Of A New Journey
Congratulations, you're now part of the Flat Rock Technology team! Get ready to embark on an exciting career journey and make a meaningful impact with us.
What Awaits You At Flat Rock
Professional Growth
We'll provide you with the training you need to thrive in your role and embark on a successful career journey.
Cutting-Edge Technologies
You'll have the opportunity to work with the latest technologies and industry best practices, ensuring you stay up-to-date and relevant.
Health and Wellness
We care about your wellbeing and offer private health and dental insurance with leading clinics in our locations.
Team Bonding
We believe in fostering strong relationships within our team through fun team-building events, office celebrations, and after-work drinks.
Career Development
We understand the importance of career growth, and our managers work with you to develop a career plan tailored to your short and long-term goals.
Modern Workspace
Our modern offices are situated in the heart of the city, designed to cater to your every need and support your success.
Continual Learning
Stay ahead of the game with our on-demand educational courses that help you deepen your skills and expertise.
Hybrid Opportunities
Experience the best of both worlds with our hybrid work environment, offering a blend of in-office and work from home flexibility (up to 2 days) subject to management approval.
Professional Growth
We'll provide you with the training you need to thrive in your role and embark on a successful career journey.
Cutting-Edge Technologies
You'll have the opportunity to work with the latest technologies and industry best practices, ensuring you stay up-to-date and relevant.
Health and Wellness
We care about your wellbeing and offer private health and dental insurance with leading clinics in our locations.
Team Bonding
We believe in fostering strong relationships within our team through fun team-building events, office celebrations, and after-work drinks.
Career Development
We understand the importance of career growth, and our managers work with you to develop a career plan tailored to your short and long-term goals.
Modern Workspace
Our modern offices are situated in the heart of the city, designed to cater to your every need and support your success.
Continual Learning
Stay ahead of the game with our on-demand educational courses that help you deepen your skills and expertise.
Hybrid Opportunities
Experience the best of both worlds with our hybrid work environment, offering a blend of in-office and work from home flexibility (up to 2 days) subject to management approval.