Senior Data Migration Engineer

The Role

As a Senior Data Migration Engineer, you will be a core execution member of the dedicated migration squad. You will work hands-on across the full migration lifecycle - from extraction and mapping through conversion, validation, and cutover - while also actively building the tooling and accelerators that make future migrations faster and safer (e.g.: artifact observability, version-controlled mapping pipelines, automated validation checks, and reusable migration templates). This is not a maintenance role: you will shape the process, own the tooling, and directly influence delivery velocity. 

IN SHORT:

🌍 Remote work or on-site (Wrocław, Bielsko-Biała) – your choice!

💰135 - 170 PLN/h + VAT

☑️ B2B contract

What You'll Get:

• 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. 

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 haves:

• 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+). 

Reasons Why You Would Enjoy Working With Us

• We work in the latest technologies and with international clients, and our projects are polished from < to /> - learn about some of the projects we have completed.

• We organize TechTalks, meet-ups and create guilds where we exchange knowledge - you can learn a lot from your teammates.

• We have a close-knit team and we make sure to have regular integrations - we often go out to celebrate together.

• You can work remotely or choose to work from our offices in Wroclaw or Bielsko-Biala. However, we count on your openness to occasionally visit the office for team meetings or client visits, or possible occasional trips to the client's headquarters.

• You can adjust your working hours to suit your needs, starting your day between 7:00 and 10:00 am.

• You can work with great specialists in their fields who also have a sense of humor and other after-hours hobbies. It is the people who create the unique atmosphere and relaxed atmosphere at CSHARK.

• We have a flat structure - we are not a corporation and don't want to be one 🙃.

• We offer bonuses for employee referrals (from 3000 PLN to 7000 PLN).

• We organize remote English classes and provide access to the company library. You can also become an author/author of articles published on our technical blog - https://cshark.com/blog/.