Senior Data Migration Engineer (Java)

O projekcie: IN SHORT: 🌍 Remote work or on-site (Wrocław, Bielsko-Biała) – your choice! 💰135 - 170 PLN/h + VAT ☑️ B2B contract Wymagania: Data Migration & Legacy Systems experience  - Proven experience with large-scale data migration projects: ETL or systems integration on enterprise-scale projects, transformation pipelines, cutover planning. - Experience working with XML-based data transformation (mapping files, XSLT, or equivalent config-driven ETL). - Proven ability to diagnose complex migration errors under time pressure: root-cause analysis, staging data fixes, re-run coordination. - Experience coordinating with business stakeholders during UAT and cutover; clear written and verbal communication in English. - Experience with legacy database analysis: reverse-engineering un(der)documented schemas, understanding data semantics and relationships without complete documentation and dealing with corrupted or ambiguous data or metadata. Technical Skills  - Comfortable working with SQL at an advanced level: complex queries, schema analysis, data profiling, and diagnosing data quality issues. - Strong proficiency in SQL across at least two of: PostgreSQL, Oracle, SQL Server, DB2. - Solid Java skills (Java 21 ecosystem preferred); comfortable building and extending internal tooling - data pipelines, automation scripts, validation frameworks - with clean, testable code. - Familiarity with Git workflows, CI/CD pipelines, and infrastructure-as-code practices. - Good exposure to cloud environments, ideally AWS infrastructure and services. - Docker: confident setup, troubleshooting, and local environment management. Domain & Governance  - Rapid domain understanding: ability to quickly absorb unfamiliar, regulated business domains. - Governance mindset: documenting decisions, maintaining audit trails, getting formal client sign-off. - Experience working with subject matter experts to define and validate data transformations and mappings. Mindset & Working Style  - Ability to manage multiple concurrent workstreams. - Clear communicator: able to explain architectural and domain modelling decisions to both technical and non-technical stakeholders. - Resilient and persistent under pressure: comfortable working with tight deadlines and high client expectations. - Actively uses AI-assisted tools (e.g. ChatGPT, Claude, GitHub Copilot or similar) as part of daily development and problem-solving workflow - we expect AI tools to be a natural part of how you work. Nice to Have   - Exposure to Smalltalk or ObjectStudio. - Familiarity with S3-compatible object storage, artifact lifecycle management, or observability tooling (dashboards, trend analysis). - Experience with cloud-native deployments on AWS; understanding of multi-tenant SaaS architectures. - Debt management, financial services, or accounts receivable domain experience is a significant advantage. - German language skills (B2+). Codzienne zadania: - End-to-end ownership of complex, high-stakes technical deliveries. - Direct contribution to tooling that will outlive the programme and be reused across 50+ customer migrations. - A growing role: as the programme industrializes, senior engineers are expected to mentor and technically lead parallel migration teams. - Exposure to a full modern stack (Java 21 / React / PostgreSQL / AWS) alongside legacy Smalltalk systems. - Long-term engagement with clear phase gates and the possibility to grow into a Lead Engineer role.