Remote Backend Engineer, AI Platform (Python & REST)

System1 Group Plc; United Kingdom; Remote; GBP 75,000 - 110,000; Full time

Benefits offered by this job

Health insurance

Pension

Remote work within UK

Wellbeing resources

Job summary

System1 Group Plc is seeking a software engineer to join an empowered product team building backend services for our AI platform. You will design, implement and own Python backends, expose clean REST APIs, and push code into production at scale within a security-conscious environment.

You’ll work API-first, contribute to MCP servers, and collaborate with data scientists and other engineers. Remote UK-friendly with occasional travel and a strong emphasis on product outcomes and customer impact.

Qualifications

• To be successful in this role, you will have approximately 3–5 years of real-world software engineering experience and be ready to operate as a first-class member of an empowered product team, where you’ll have outsized influence on the outcomes we deliver.
• Strong commercial experience building backend services in Python.
• Experience designing and building REST APIs, ideally spec-driven, with a clear understanding of what frontends need from a headless architecture.
• Experience building SaaS software and taking code into production at scale, whether as part of a team or with personal responsibility for it.
• Hands-on experience with at least one major cloud platform (e.g. AWS, Azure, GCP).
• A working understanding of infrastructure as code and the ability to contribute to it.
• Solid experience working with databases and data modelling.
• Daily use of Claude Code as an engineering tool, including building your own skills and subagents, with an engineering-led approach rather than vibe coding.
• Experience building MCP servers, or a strong understanding of MCP and a drive to build with it.
• Experience working in a product operating model, as part of an empowered, cross-functional product team.
• Familiarity with the security and compliance requirements of enterprise customers.
• Familiarity with machine learning systems, or a genuine desire to learn, is a plus.

Responsibilities

• Partner as a member of an empowered product team (Product Manager, Product Designer, Team Lead and engineers), sharing accountability for the outcomes your team commits to.
• Contribute to continuous product discovery, helping the team assess feasibility early and building quick technical prototypes to test ideas before we commit to building.
• Design, build and own Python backend services for our AI platform, from media upload through asynchronous ML processing to insight delivery.
• Work API-first and spec-driven, defining clean REST contracts that serve headless frontends, internal teams and customer integrations.
• Build MCP servers that make System1’s data and capabilities available to AI agents and tools, for customers and colleagues alike.
• Engineer through Claude Code day to day, building and sharing skills, subagents and workflows that raise the speed and quality of the whole team.
• Take code into production at scale with confidence, bringing the testing, observability and reliability our enterprise customers expect.
• Contribute to our infrastructure as code and cloud environment, understanding how your services are deployed, run and scaled.
• Work alongside our data scientists to bring models into production, learning the machine learning side of the platform as you go.
• Build with enterprise security and compliance in mind, so the world’s largest advertisers can trust the platform with their data.

Skills

Python backend

REST APIs

SaaS experience

Cloud platforms

Infrastructure as code

Databases & data modelling

Claude Code

MCP servers

Product team collaboration

Security & compliance

ML systems familiarity

Tools

Claude Code

Job description

System1 Group Plc is seeking a software engineer to join an empowered product team building backend services for our AI platform. You will design, implement and own Python backends, expose clean REST APIs, and push code into production at scale within a security-conscious environment.

You’ll work API-first, contribute to MCP servers, and collaborate with data scientists and other engineers. Remote UK-friendly with occasional travel and a strong emphasis on product outcomes and customer impact.