Senior Backend Engineer – Go / Golang6 month contract – hybrid (Dublin, London, Barcelona, Warsaw or Berlin)I'm working with a product-led SaaS company looking for multiple senior backend engineers to join their platform teams.These roles sit across core backend services and a newer AI-focused area building agentic capabilities.This is a hands-on role in a brownfield environment, focused on improving and extending existing Go services at scale.Key requirements• Strong hands-on Go experience, maintaining and improving existing services rather than only greenfield builds• Solid PostgreSQL experience, including schema design, query optimisation, performance tuning and safe migrations• Experience with distributed systems, microservices and event-driven architectures, ideally with Kafka or similar• Comfortable working independently from product requirements where technical direction is not fully defined• Confident using AI coding agents as part of day-to-day developmentAdditional experience (depending on team)• Experience building agents, agentic tooling or MCP servers• Exposure to Temporal for workflow orchestration• Experience integrating messaging platforms such as Twilio• Exposure to Node.js, TypeScript or PythonEnvironment• Product-led, engineering-driven culture• Distributed systems operating at scale• Strong focus on pragmatic delivery and iteration• Increasing investment in AI-assisted development and agentic systemsContract details• 6 month initial contract with strong likelihood of extension• Hybrid working in Dublin, London, Barcelona, Warsaw or Berlin• Competitive day rateIf this sounds relevant, send me a message and I'll share more detail.