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Wissen Technology

Posted 27 Oct 2026

Sr. Fullstack Developer - React Heavy + Java

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Employment
Full time
Team
Software Engineering
Posted
27 Oct 2026

About the role

We're looking for a Senior Full-stack Developer with 5+ years of experience. The role centers on front-end engineering with React, backed by solid Java and Spring Boot experience. You'll design and build scalable, accessible, high-performance user interfaces and the services behind them. You'll work closely with product managers, designers, architects, and QA to deliver features end-to-end. You'll also own technical decisions within your area, review code, and mentor other engineers.


Responsibilities:

  • Design, build, and maintain scalable web applications using React, TypeScript/JavaScript, HTML5, and CSS3.
  • Architect reusable component libraries and front-end patterns that the wider team can adopt.
  • Own front-end design decisions, including state management, application structure, and API integration strategy.
  • Turn design mockups into responsive, accessible, high-quality interfaces.
  • Design, develop, and maintain backend REST services using Java and Spring Boot.
  • Work with relational databases, including writing and optimizing queries and designing data models.
  • Drive front-end performance, security, accessibility, and reliability improvements.
  • Write and promote strong automated testing practices across front-end and backend code.
  • Lead code reviews, contribute to technical design discussions, and raise engineering standards.
  • Mentor junior and mid-level developers and support their growth.
  • Take ownership of features and modules from design through release and production support.
  • Diagnose and resolve complex issues across the front end and backend.
  • Collaborate with cross-functional teams in an Agile environment and help with estimation and planning.


Requirements:

  • 5+ years of professional software development experience.
  • Deep, hands-on experience building production applications with React, including:
  • Modern React patterns (hooks, component composition, and state management).
  • Performance optimization and debugging in large applications.
  • Consuming and integrating REST APIs reliably.
  • Strong proficiency in JavaScript (ES6+) and TypeScript.
  • Strong HTML5 and CSS3, with experience building responsive, accessible interfaces and using a UI library or design system.
  • Solid experience developing backend applications with Java and Spring Boot, including designing REST APIs.
  • Good understanding of authentication and authorization concepts and web security fundamentals.
  • Experience with relational databases and SQL.
  • Experience with Git, automated testing, and CI/CD practices.
  • Ability to make sound design decisions and explain trade-offs.
  • Strong problem-solving, communication, and collaboration skills, with experience mentoring other developers.

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