Senior Fullstack Developer Java React Skills Needed

Senior Fullstack Developer

PLN 17 700 - 23 500 gross - Contract of Employment

PLN 140 - 180 net/h - B2B

Gdynia or 100% remote

Job Overview

We’re looking for a Senior Fullstack Developer to join our Product Department – the ~20-person crew behind SolDevelo’s apps for the Atlassian Marketplace and monday.com Marketplace. Think Worklogs, QAlity, and Checklists: tools relied on by everyone from small teams to huge, well-known corporations to run their Jira workflows. We build what our users actually ask for – closely listening to their feedback and shipping the features that matter to them, so what you build gets used, fast.

You’ll join one of our two Scrum teams – comprising 3-4 developers, a tester, a product owner, and a UI/UX specialist – each owning a distinct set of products. This is a role for someone who wants to be the senior engineer our mid-level developers learn from: you’ll set the technical direction on the backend, maintain high code quality, and inspire those around you to raise their own bar. On the frontend, you’ll collaborate confidently; you don’t need to be a frontend authority, just capable of delivering features end-to-end.

About SolDevelo

SolDevelo has been building software for 15+ years. We’re an Atlassian Gold Marketplace Partner, ISO 9001 and ISO 27001 certified, and have a team of around 60 people company-wide. In our Product Department, we keep things lean: small teams, direct customer feedback, and short paths from idea to production.

Responsibilities

Design and build features end-to-end – owning the backend architecture and contributing to the frontend alongside your team.
Own backend code quality: set the standards, enforce them in reviews, and keep the codebase healthy over the long run.
Be the mentor and technical leader for our mid-level developers – pair with them, coach them, and help them grow into seniors.
Inspire the team by example: bring ideas, share what you learn, and set the tone for how we build.
Contribute to architectural decisions with a focus on performance, security, and maintainability.
Engage with design and product early, helping shape and influence business decisions before implementation even starts.
Advocate for decisions that hold up at scale and stand the test of time, and speak up when they don’t.
Help our service desk team dig into trickier customer-reported issues.

Tech Stack & Tools

Backend: Java 17+, Spring Boot 3+
Frontend: React 16+, TypeScript, Webpack, ESLint
Testing: JUnit, Jest, React Testing Library, Playwright
CI/CD: Bitbucket Pipelines
AI tooling: Rovo Dev, Claude, Gemini
Methodology: Agile / Scrum

Must have

A minimum of five years of professional experience in software development.
Senior-level, hands-on expertise in backend development with Java and Spring Boot.
A proven track record designing and implementing backend architecture for web applications.
Solid, mid-level working knowledge of React and TypeScript – enough to deliver production frontend features on your own.
Commercial experience with unit testing on both backend and frontend.
Proven ability to write performant, maintainable, and testable code.
Demonstrated experience mentoring and leading mid-level developers – and genuine motivation to keep doing it.
Solid tech debt management skills – identifying and prioritizing it; designing refactor plans.
Strong knowledge of application security practices (e.g. OWASP Top 10) and the ability to define, implement, and monitor a security strategy in collaboration with DevOps and QA.
Ability to estimate complex projects end-to-end, coordinate the estimation process for the team, and account for uncertainty and risk in requirements.
Comfortable working async with a distributed team.
Excellent command of Polish (C1 or higher).
Excellent command of English (C1 or higher).

Nice to have

Familiarity with the Atlassian ecosystem or background in building on Atlassian Forge, Connect, or another third-party app platform (Shopify, Salesforce, etc.).
Experience running knowledge-sharing formats – internal talks, tech guilds, onboarding programs.
Good UI taste with attention to detail – comfortable pushing back on proposed designs and offering alternatives.
Exposure to AI and agentic workflows.

Benefits

Fully remote work – we don’t do “remote but come to the office on Tuesdays”.
Flexible working hours, with core hours 10 AM – 3 PM (CEST).
12,000 PLN yearly budget for certificates and training.
Dedicated time set aside each month for learning, on top of the training budget.
Company and team integration events.
MultiSport card.
Amazon Kindle and 150 PLN quarterly for e-books.
150 PLN quarterly for cultural & sports activities.
Private medical care.

Recruitment Process

Initial Application: Submit your application through our online form.
Screening: Our recruitment team will review your application to ensure you meet the basic requirements.
Telephone Interview: A preliminary conversation to discuss your experience and suitability for the position.
Preliminary Acceptance: If successful, you will move forward to the technical verification stage.
Technical Verification (1-2h): An in-depth assessment of your technical skills and knowledge.
Meet the Team: A 30-minute call with the team.
Offer: If successful, you will receive a formal job offer.