Lead Data Migration Engineer with .NET Job at Cshark (Wrocław)

Job Description

You will lead the data migration workstream for a compliance-critical public-sector registry system. The core challenge: converting a fully normalised relational database into an event-sourced architecture, migrating large volumes of document files, and ensuring every data related decision is documented and approved by the client. This is not a standard backend role. You need to understand legacy data deeply, make domain-informed decisions under uncertainty, and deliver under tight timelines with high client visibility.

Job Responsibility

Lead the data migration workstream for a compliance-critical public-sector registry system
Converting a fully normalised relational database into an event-sourced architecture, migrating large volumes of document files, and ensuring every data related decision is documented and approved by the client

Requirements

Proven experience with large-scale data migration projects: ETL, transformation pipelines, cutover planning
Hands-on experience with event sourcing (relational-to-event model transformation): decomposing relational data into domain events with deterministic ordering
Experience with legacy database analysis: reverse-engineering un(der)documented schemas, understanding data semantics and relationships without complete documentation
Experience with data quality handling: nulls, duplicates, inconsistent formats, missing fields, validation rules
Familiarity with document/file migration at scale: metadata extraction, filename parsing, large-volume validation and dealing with corrupted or ambiguous data or metadata
Strong knowledge of backend design patterns (dependency injection, repository, mediator, factory)
English language skills (B2+ minimum): required for clear communication with stakeholders and documentation of architectural decisions
Hands-on experience with CQRS, Domain-Driven Design, and Event Sourcing
Ability to design and implement aggregates, entities, value objects, and bounded contexts
Skilled in building systems that enforce clear separation of concerns, scalability, and maintainability
Solid understanding of clean architecture principles
Strong experience with .NET / C# backend development
Practical knowledge of Modular Monolith
Experience with PostgreSQL and modern ORM frameworks (e.g. Entity Framework or equivalent)
Experience with Marten DB or willingness to learn quickly
Exposure to CosmosDB or similar NoSQL/document databases
Experience designing and consuming RESTful APIs
Docker: confident setup, troubleshooting, and local environment management
Good exposure to cloud environments, ideally Azure infrastructure and services
Comfortable working with SQL at an advanced level: complex queries, schema analysis, data profiling, and ad-hoc investigation of production data
Rapid domain understanding: ability to quickly absorb unfamiliar, regulated business domains (registries, compliance, legal records)
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
Public-sector, institutional or regulatory software experience is a significant advantage

What we offer

100% remote work
Flexible hours
International projects
Business english lessons
Participation in charity actions
In-house technology workshops

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Lead Data Migration Engineer with .NET

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