HubMub
-
Sii Poland

Fullstack Developer – Java and React.js

Sii Poland
Poland · Full-time · Mid-Senior
Are you a Java Fullstack Developer with a passion for building modern web applications using React on the frontend? Are you looking to join a global project where your work will truly make an impact? This might be the perfect opportunity for you!

Sii is partnering with a U.S.-based technology company recognized for its cutting-edge observability and monitoring solutions used by some of the world’s largest enterprises. Their scalable, high-performance products help teams ensure system reliability and gain deep operational insights.

You’ll work in an international environment, contributing to the development of powerful, cloud-native solutions. Occasional business trips to the U.S. — including a 2-week onboarding in North Carolina — are a very nice to have, but not mandatory. Ready to level up your fullstack career? Apply now!

Your tasks

  • Lead the design and development of complex, scalable web solutions using OOP principles and web development technologies such as React (TypeScript), and Spring (Java)
  • Be a champion in engineering excellence, which starts from clean, testable code and spans through unit tests
  • Go beyond unit tests with the test-first approaches like test-driven development and behaviour-driven development
  • Collaborate closely with product managers, architects, UX designers, and other stakeholders to define and implement software functionality, architecture, and system designs

Requirements

  • At least 7 years of experience in software development, with at least 4 years focusing on a commercial software product
  • Knowledge of React (TypeScript), and Spring (Java), with a strong understanding of OOP principles and design patterns
  • Proficiency with relational databases (e.g., PostgreSQL, Oracle) and ORM frameworks, and familiarity with cloud platforms (e.g., AWS)
  • Experience setting up CI/CD pipelines (GitLab CI/CD) and utilizing DevOps practices
  • Familiarity with microservices architecture and containerization (e.g., Docker, Kubernetes)

Job no. 250722-MLFXZ

Benefits For You

Great Place to Work

Solid financial situation

Contracts with the biggest brands

Centre of internal trainings

Many experts you can learn from

Open and accessible management team

Profit sharing

Passion Sponsorship program

Regular integration events and trips

Comfortable and well-equipped offices

MySii app

Medical care

Key Skills

Ranked by relevance

react typescript cloud java cicd oop containerization microservices postgresql docker devops oracle gitlab ux
Login to Apply
🇵🇱

Country Guide

Poland

Fast-growing Central European IT hub

Posted
Sep 04, 2025
Type
Full-time
Level
Mid-Senior
Location
Rzeszów
Company
Sii Poland

Industries

IT Services IT Consulting

Categories

Information Technology

Related Jobs

3 roles aligned with this opportunity

View all jobs
View Job Details
Sii Poland
Related

React Developer (f/m/x)

2026-05-16

Full-time
Mid-Senior
Poland
IT Services
Engineering
View Job Details
Sii Poland
Related

Senior Fullstack Engineer – music tech industry (f/m/x)

2026-05-08

Full-time
Mid-Senior
Poland
IT Services
Information Technology
View Job Details
Sii Poland
Related

Senior Fullstack Engineer – music tech industry (f/m/x)

2026-05-08

Full-time
Mid-Senior
Poland
IT Services
Information Technology