Software Developer - Python - Data Migration

SR2 REC LTD; Remote; GBP 45,000 - 65,000; Full time

Job summary

A leading AI development company in the UK is seeking a Software Developer with strong Python skills to support a 3-month data migration programme. You will tackle legacy systems, build migration tooling, and collaborate closely with product teams to ensure successful transitions. The ideal candidate has solid experience in PostgreSQL, API work, and communicates effectively with stakeholders. This role offers an opportunity to drive impactful change in a fast-paced, evolving environment.

Qualifications

• Strong experience in production environments using Python.
• Solid knowledge of complex PostgreSQL schemas.
• Ability to reverse-engineer undocumented systems.

Responsibilities

• Reverse-engineer undocumented PostgreSQL schemas.
• Build Python migration scripts for data transformation.
• Collaborate with teams to define migration acceptance criteria.

Skills

Strong Python development experience

Solid PostgreSQL knowledge

Proven ability to reverse-engineer systems

Experience working with APIs

Familiarity with S3 or similar storage

Confident communicator

Comfortable working with ambiguity

Job description

Software Developer | Python | Data Migration

We're supporting a fast-growing AI scale-up on an intensive 3-month migration programme, moving existing client environments onto a next-generation platform. This is a hands-on role for a pragmatic Python developer who enjoys untangling legacy systems, working at pace, and delivering outcomes rather than perfection.

The Role

You'll join a rapidly scaling engineering team to design and build migration tooling that transitions complex, poorly documented client environments into a modern platform. The work is investigative, collaborative, and delivery-focused, requiring close alignment with Product and Customer Success to define and validate what "good" looks like.

Key Responsibilities

• Rapidly reverse-engineer undocumented PostgreSQL schemas and legacy data structures
• Understand how existing database records and S3-stored objects drive product behaviour
• Build Python-based migration scripts to transform legacy notebooks and data into new platform formats
• Handle pickle file deserialisation and complex data transformation logic
• Collaborate with Product and Customer Success to define migration acceptance criteria
• Balance speed and quality to meet an aggressive delivery timeline
• Validate migration outputs against agreed business requirements
• Document migration logic, decisions, and create runbooks for handover

Essential

• Strong Python development experience in production environments
• Solid PostgreSQL knowledge, including complex schemas and relationships
• Proven ability to reverse-engineer undocumented or legacy systems
• Experience working with APIs (Flask and/or FastAPI)
• Familiarity with S3 or similar object storage
• Confident communicator able to explain technical concepts to non-technical stakeholders
• Comfortable working at pace with ambiguity and evolving requirements

Desirable

• Experience delivering data migration or platform modernisation projects
• Exposure to Jupyter notebooks or computational notebook environments
• Background in consulting, contracting, or startup environments
• Experience working with legacy systems and technical debt
• Knowledge of data serialisation formats and trade-offs

The Details

• Contract: 3 months
• Location: Remote
• IR35: Outside

If you're a Python developer who thrives on complexity, enjoys uncovering how systems really work, and can deliver pragmatic solutions under tight timelines, get in touch to discuss further.