Senior Full-Stack Engineer — AI & Data Platform (Hybrid)

Harnham - Data and Analytics Recruitment; Greater London; Hybrid; GBP 80,000 - 120,000; Full time

Benefits offered by this job

Competitive base salary

Flexible working options across London

Autonomy from day one

Exposure to complex data systems

Small high-impact team

Clear progression as team scales

Job summary

Harnham - Data and Analytics Recruitment is seeking a Senior Full Stack Engineer to join a hybrid London-based team. You will build AI agents, develop prototypes, and modernise legacy systems, delivering measurable results across the data platforms.

You’ll work with Python, TypeScript, and SQL in a fast-paced environment, collaborating with senior engineering leadership to ship features weekly and maintain high-quality code, APIs, and documentation.

Qualifications

• Strong commercial experience delivering software in fast-paced environments.
• Hands-on development across Python, TypeScript, and SQL.
• Comfortable working with modern AI tooling and agent-based development workflows.
• Experience working with data systems, including schema design, data quality, or lineage.
• Ability to understand and work across unfamiliar codebases effectively.
• Clear communication skills, including writing high-quality pull requests and presenting work.
• A proactive, self-directed approach with a focus on delivering outcomes quickly.

Responsibilities

• Build internal AI agents and tools that improve productivity and unlock value from group data
• Develop prototypes that validate ideas quickly and can be demonstrated on a weekly basis
• Modernise legacy systems using AI-assisted analysis and development approaches
• Wrap existing systems with clean, scalable APIs to enable wider consumption
• Generate documentation, tests, and migration tooling to support platform evolution
• Contribute to shared data and entity platform development across the organisation
• Continuously improve code quality, leaving systems clearer and more maintainable

Skills

Python

TypeScript

SQL

AI tooling

Agent-based development

Data systems

Codebase comprehension

Communication

Tools

API design

AI tooling platforms

Job description

Harnham - Data and Analytics Recruitment is seeking a Senior Full Stack Engineer to join a hybrid London-based team. You will build AI agents, develop prototypes, and modernise legacy systems, delivering measurable results across the data platforms.

You’ll work with Python, TypeScript, and SQL in a fast-paced environment, collaborating with senior engineering leadership to ship features weekly and maintain high-quality code, APIs, and documentation.