Middle Full Stack Engineer (.NET + React)

This is us

At Avenga, we believe that human creativity empowers technology that matters. Operating globally, our 6000+ specialists provide a full spectrum of services, including business and tech advisory, enterprise solutions, CX, UX and Ul design, managed services, product development, and software development.

This is the job

We are looking for a Full Stack Engineer to join our team and work on both an established financial platform and a new generation of modern cloud-based solutions.

You will contribute to maintaining and modernizing an existing ASP.NET platform while also helping build a greenfield platform using .NET, TypeScript, React/Next.js, and microservices. The role combines hands-on development, architectural thinking, production support, and AI-assisted engineering in a regulated financial services environment.

This is you

• 4+ years of professional software development experience.

• Strong proficiency in C# and .NET.

• Hands-on knowledge of ASP.NET Web Forms and/or MVC, including working with legacy codebases.

• Good command of TypeScript and React.

• Solid knowledge of SQL Server, including query writing, optimization, indexing, and data access patterns.

• Strong written and verbal communication skills, with the ability to explain technical concepts to non-technical stakeholders.

• Practical knowledge of AI-assisted development tools such as GitHub Copilot, Cursor, or Claude.

• Growth mindset and willingness to work on both existing systems and greenfield solutions.

• Ability to write clean, maintainable, testable, and well-documented code.

• Security-conscious approach to software development.

• Upper-Intermediate level of English.

Nice-to-have skills:

• Knowledge of the FIX protocol, particularly trading system integrations, order routing, or institutional messaging.

• Understanding of event sourcing and CQRS patterns.

• Familiarity with Kubernetes or AKS and containerized workloads.

This is your role

• Develop and maintain features across the existing ASP.NET Web Forms/MVC platform using C#, .NET, and SQL Server, including query and data access optimization.

• Support and extend FIX protocol integrations and troubleshoot production issues in a critical financial environment.

• Contribute to the development of a greenfield platform using TypeScript, React/Next.js, REST APIs, .NET microservices, and AKS.

• Participate in architectural decisions and apply modern patterns such as CQRS and event sourcing where appropriate.

• Use AI-assisted development tools while maintaining high standards for code quality, testing, security, and maintainability.

• Improve observability and documentation through logging, metrics, tracing, runbooks, and technical specifications, while collaborating effectively with technical and non-technical stakeholders.

At Avenga, everyone matters. We provide equal opportunities in recruitment, career development, and leadership, regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to fostering a work environment where our diverse community of employees, candidates, and business partners actively shapes our growth. By bringing together people from different backgrounds and experiences, we build a workplace where everyone feels free to be themselves while honoring the boundaries of others.