Fullstack React/Java Developer Greenfield project

Infotree Global Solutions Inc.; Warszawa; On-site; PLN 180,000 - 280,000; Full time

Job summary

Infotree Global Solutions Inc. is seeking a Full-stack Developer (React/Java) to join our fintech team in Warsaw. You will build and enhance business-critical applications used in a front-office trading environment.

You will work with experienced engineers to implement robust React frontend and Java/Python backend, integrate REST APIs, and participate in CI/CD processes and testing in a fast-paced financial services setting.

Qualifications

• 4+ years of frontend development experience.
• 1–2 years of backend development experience (Java or Python).
• Strong React (Hooks, Context API) and JavaScript skills.
• Experience with modern CSS (CSS-in-JS, SCSS).
• Knowledge of design patterns, Jest, npm, CI/CD, and GitLab.
• Experience building and consuming REST APIs.

Responsibilities

• Develop and maintain frontend features for business-critical trading applications.
• Collaborate with experienced engineers to deliver robust APIs and services.
• Participate in code reviews, testing, and CI/CD workflows.
• Contribute to architecture decisions and design patterns.

Skills

Frontend experience

Backend experience

React

JavaScript

CSS-in-JS

SCSS

Design patterns

Jest

npm

CI/CD

GitLab

REST APIs

Tools

AG Grid

Cypress

Job description

We're Hiring: Full-stack Developer (React/Java) | Financial Services

You'll work alongside experienced engineers, building and enhancing business-critical applications used within a front-office trading environment. The platform processes significant trading volumes daily and plays a key role in the firm's success.

Requirements

• 4+ years of commercial frontend development experience
• 1–2 years of commercial backend development experience (Java or Python)
• Strong React (Hooks, Context API) and JavaScript skills
• Experience with modern CSS (CSS-in-JS, SCSS)
• Knowledge of design patterns, Jest, npm, CI/CD, and GitLab
• Experience building and consuming REST APIs

Nice to have

• AG Grid
• Cypress
• Understanding of UX principles
• Experience working in financial services or trading environments