Senior Full Stack Java/React Developer – Platform Solutions
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Salary
$61k – $74k per year
Location
Hybrid (Kraków, Poland)
Seniority
Senior
Employment
Contractor
First seen by Alion on Nov 10, 2026.
Overview
Company
Impact
Profile match
ITDS is a Polish technology consulting and staffing firm that supplies engineers, analysts and project specialists to banks, insurers and other financial institutions. Its consultants work inside client delivery teams on software development, testing, business analysis, data engineering, cloud infrastructure and cybersecurity, usually on long-running programmes rather than short advisory engagements. The firm is based in Warsaw, recruits across Poland and increasingly for remote assignments elsewhere in Europe, and posts a high volume of contract and permanent technology vacancies under its own name on behalf of client employers.
Unleash scalable solutions — build the future of collaborative platforms!
Kraków-based opportunity with hybrid work model.
As a Senior Full Stack Developer, you will be working for our client, a leader in innovative platform solutions for collaboration and data management. You will contribute to the design, development, and maintenance of the cutting-edge CollaborationHub platform, including LakeHouse and WorkSync solutions, empowering teams to connect and innovate seamlessly.
Your main responsibilities:
- Contribute to the platform’s solution design and technical strategy.
- Develop and maintain backend services and Web APIs in Java.
- Build dynamic frontend features using JavaScript frameworks (React), HTML, and CSS.
- Design and optimize PostgreSQL databases, including data models and SQL queries.
- Integrate services, APIs, and data flows across the platform.
- Write, execute, and maintain tests; participate in QA, defect investigation, and release validation.
- Collaborate with cross-functional teams to ensure high-quality delivery and continuous improvement.
You're ideal for this role if you have:
- At least 5 years of professional experience in full stack development.
- Strong proficiency in Java, SQL (PostgreSQL), and database design.
- Extensive experience with JavaScript, React, HTML, and CSS.
- Hands-on experience with ETL/ELT pipelines.
- Solid understanding of SDLC and version control tools (Git).
- Strong problem-solving skills and meticulous attention to detail.
- Good interpersonal communication skills.
- English language proficiency at B2+ level.
It is a strong plus if you have:
- Prior experience in cloud environments or related certifications.
- Familiarity with Agile methodologies and Scrum.
Language required for the role:
- English (Communicative level).
Eligibility to work on this role:
- Only candidates with an existing legal right to work in the European Union will be considered for this role.
#MAKEYourCareerBETTER
Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.
Tech stack
- Java
- React
- PostgreSQL
- JavaScript
- REST APIs
- ETL/ELT pipelines
- HTML/CSS
- Git
- Cloud environments
- Agile/Scrum
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