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Senior Software Engineer
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Senior Software Engineer | Hybrid - London | Up to £110,000+ 10% Bonus + Benefits
We’re partnering with a major global payments and technology business that is investing heavily in the future of AI and autonomous commerce.
As AI agents increasingly discover products, compare options and initiate purchases on behalf of consumers, new infrastructure is needed around trust, identity, user intent, authentication, tokenisation, fraud and real-time transaction visibility.
They are now looking for a Senior Software Engineer to join a team building the technology that will enable AI agents, merchants and payment platforms to interact securely and reliably.
The Role
As a Senior Software Engineer, you’ll play a key role in building secure, scalable backend services supporting the future of agentic commerce.
This is a highly hands-on role, working across AI agent integrations, APIs and payment infrastructure. You’ll take ownership of features from design through to deployment and production.
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What You’ll Be Doing
AI & Agentic
- Design and build secure APIs and services that AI agents can invoke reliably
- Develop systems around user intent, delegated authority, payment credentials and transaction validation
- Build integrations across AI agents, payment platforms, checkout, authentication, tokenisation and fraud systems
Backend & API Engineering
- Build high-performance Java-based backend services supporting real-time transaction workflows
- Develop merchant-facing APIs, SDKs and developer tooling
- Own features from design and implementation through to deployment and monitoring
- Help drive high standards around security, observability, resilience and maintainability
What We’re Looking For
- 5+ years’ experience in software engineering
- Strong experience building production backend services and APIs
- Strong Java experience
- Experience with distributed systems or transaction-processing platforms
- Experience with AWS or GCP
- Strong understanding of API design, testing, CI/CD and observability
- An interest in AI agents and agentic workflows
- Ability to work across engineering, product, security and platform teams
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Desirable Experience
- Payments, fintech, commerce or other high-trust technology environments
- AI agents, LLM applications or tool-calling
- MCP-style integrations or structured automation workflows
- Payment gateways, checkout, tokenisation, authentication, fraud or risk systems
- Node.js, TypeScript, SDKs or developer tooling
Why Apply?
- Work at the intersection of AI, distributed systems and global commerce
- Join a team building new technology in an emerging product area
- Work on complex, real-world AI and transaction infrastructure
- Collaborate with experienced engineers across a major global technology platform
If you’re a strong engineer with an interest in AI and autonomous systems, and want to work on technology shaping the future of digital commerce, we’d love to share more.
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