Senior Software Engineer – Agentic Commerce - (London)
Total System Services, LLC (TSYS)2 days ago
London, United KingdomSenior
Responsibilities
- Design and build secure, reliable Java backend services for real-time agentic commerce and payment workflows.
- Develop checkout and payment APIs that support AI-agent invocation, agent context, user intent, delegated authority, credentials, risk signals, and transaction evidence.
- Integrate agentic commerce capabilities with payment platforms, gateways, checkout, tokenization, authentication, fraud, reporting, and merchant-facing systems.
- Build merchant-facing APIs, SDKs, documentation, sample flows, sandbox experiences, and developer tools.
- Own features through design, implementation, testing, deployment, monitoring, iteration, code review, documentation, and production readiness.
- Collaborate with product, architecture, security, fraud, checkout, tokenization, gateway, and platform teams.
Requirements
- 5+ years of software engineering experience, including building and operating production services, APIs, distributed systems, or transaction-processing applications.
- Experience building and operating cloud-based systems on AWS, Google Cloud Platform, or comparable public cloud environments.
- Strong fundamentals in deployment, monitoring, reliability, secure service design, API design, testing, observability, resilience, maintainability, and production support.
- Practical interest in AI agents and agentic workflows, including API invocation, structured data, delegated permissions, and validation before real-world actions.
- Bonus: experience in payments, fintech, commerce, gateways, card-not-present processing, checkout, tokenization, 3DS/SCA, fraud/risk, disputes, or merchant reporting.
- Bonus: experience with AI-powered applications, agent frameworks, LLM tool-calling patterns, MCP-style integrations, A2A-style workflows, safe AI execution, policy checks, audit logs, fallback paths, prompt-injection protection, or tool-misuse protection.
- Bonus: hands-on experience with Node.js, TypeScript, SDKs, developer tooling, sandbox environments, sample applications, merchant-facing APIs, GitHub projects, open-source tools, standards discussions, AI engineering communities, or technical forums.