New offer - be the first one to apply!

June 18, 2026

Senior Fullstack Engineer

Senior • On-site

Stockholm, Sweden

Role Overview

We are looking for a skilled Fullstack Developer with strong backend expertise in ASP.NET and C#, combined with modern frontend development using React. The role involves building scalable web applications, designing robust APIs, and contributing to cloud-native and event-driven architectures. The ideal candidate is comfortable working across the full stack, collaborates well in agile teams, and has an interest in modern tooling, orchestration, and frontend ecosystems.

Core Responsibilities

  • Design, develop, and maintain scalable fullstack applications
  • Build and maintain backend services using ASP.NET and C#
  • Develop responsive and modern frontend applications using React
  • Design and integrate APIs and asynchronous communication flows
  • Collaborate with developers, designers, QA, and DevOps teams
  • Contribute to architecture discussions and technical decisions
  • Ensure code quality through testing, reviews, and CI/CD practices
  • Participate in deployment, monitoring, and troubleshooting activities

Must-Have Skills

Backend

  • Strong experience with ASP.NET
  • Strong experience with C#
  • Experience building scalable backend services and APIs

Frontend

  • Strong experience with React
  • Good understanding of modern frontend architecture and component-based development

Should-Have Skills

  • Experience with GitLab Pipelines / CI-CD
  • Experience with API design and best practices

Frontend Libraries & Tooling

  • TanStack
  • Tailwind CSS
  • Playwright
  • AI agent development (Kiro, Claude, Cursor)

Messaging & Async Communication

  • RabbitMQ
  • Event-driven and asynchronous communication patterns
  • Understanding of async workflows across frontend and backend systems

Infrastructure & Orchestration

  • Docker
  • Kubernetes
  • Familiarity with containerized deployments and orchestration

Nice-to-Have Skills

  • Interest or experience in Unity / game development
  • Strong Linux competence

Preferred Qualifications

  • Experience working in agile development environments
  • Strong problem-solving and debugging skills
  • Understanding of scalable and maintainable software architecture
  • Good communication and collaboration skills
  • Passion for learning modern technologies and frameworks

Tech Stack Summary

  • Backend: ASP.NET, C#
  • Frontend: React
  • Frontend Libraries: TanStack, Tailwind, Playwright
  • Messaging: RabbitMQ
  • Infrastructure: Docker, Kubernetes
  • CI/CD: GitLab Pipelines
  • Additional: Linux, API Design, Unity