Senior Full-Stack Engineer (.NET + React)

Salary: £40,000 Location: Remote UK Only Candidates in the UK will be considered.

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. 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 scalable and secure web applications using .NET, React, and related technologies Take ownership of the entire development lifecycle, including architecture design, coding, testing, deployment, and support Collaborate closely with cross-functional teams, including Product Managers, Designers, and QA Engineers, to deliver high-quality software solutions Lead code reviews, ensuring best practices in coding standards, security, and performance Provide mentorship and technical guidance to junior and mid-level developers Stay updated with emerging technologies and recommend improvements to enhance the technology stack Troubleshoot and resolve complex technical issues to ensure smooth operation of applications Proficient in leveraging AI tools and platforms to support and enhance daily tasks and operational workflows 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 optimisation 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!

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Only short-listed candidates will be invited for an interview.

We can’t wait to meet you!