Senior Full-Stack Engineer

About this role

About Avaron AB

Avaron helps you find assignments that match your skills and ambitions. As a permanently employed consultant with us, you get competitive terms – combined with the variety and growth that a consulting career offers. About the Assignment You will help build and evolve modern web applications end to end in an environment where scalability, reliability, and performance are central. The assignment combines frontend and backend development, with a strong focus on TypeScript, robust APIs, and solutions tailored for both web and mobile clients. You will work close to engineering, product, and business stakeholders, contributing to software that needs to perform well in production at scale. Clean architecture, observability, automated quality assurance, and secure delivery are important parts of how the work is done. This is a strong opportunity for you if you enjoy hands-on development while influencing technical decisions in a high-traffic environment. Job DescriptionYou will build and maintain modern full-stack applications using Node.js, React, and TypeScript. You will design and develop APIs and orchestration layers that support web and mobile clients. You will contribute to system design decisions around caching, scalability, reliability, performance optimization, and observability. You will help ensure high software quality through unit testing, automated quality assurance, and maintainable test coverage. You will drive engineering best practices around clean code, code reviews, CI/CD, security, and maintainability. You will collaborate closely with engineering, product, and business teams to move work forward effectively. You will work in an Agile setup with sprint planning, estimation, iterative delivery, and continuous improvement. RequirementsStrong full-stack engineering experience with deep expertise in Node.js and React. Proficiency in TypeScript and hands-on experience building scalable, maintainable, and strongly typed codebases. Strong und