Senior Software Engineer, Golang

Senior Software Engineer, Golang Full-time | Hybrid | Sydney About Checkbox Checkbox is an Australian scale-up building AI-first SaaS for enterprise legal teams. We have an established product in market, two new greenfield technology products, and a growing global customer base across Australia, the US, and Asia. We are now embarking on a major new project to transform our SaaS ecosystem into agentic-first products, using AI agents and intelligent workflow automation to change how legal work is raised, routed, managed and resolved. We are backed by Touring Capital, Peak XV, previously Sequoia APAC, and Tidal VC. We are building a culture where people feel trusted, supported, and empowered to do their best work on complex engineering problems with real customer impact. About the Role At Checkbox, you will help build modern AI-first SaaS software as part of a tight-knit engineering team. You will contribute to a codebase built primarily in Golang , developing high-performance backend services and event-driven systems that support the next generation of agentic AI products across our platform. Engineering Environment Languages and Frameworks: Golang, Go Standard Library Infrastructure and Architecture: AWS, Amazon SQS, Docker, Kubernetes, PostgreSQL, event-driven services, Pub/Sub patterns What You’ll Do Design, architect and build complex backend features Build and maintain high-performance, scalable services in Golang Contribute to a future-ready, high-quality and performant codebase Help build event-processing systems that support AI-first and agentic product experiences Share technical ideas through design reviews and code reviews Champion best-practice engineering standards and processes About You 5+ years of commercial experience building complex, enterprise software systems Experience working with HTTP requests in Go, Gin or the Go Standard Library Working knowledge of event-driven systems, including encryption/decryption of events or Pub/Sub patterns Understanding of performance principles in modern web development Production experience with PostgreSQL or other SQL databases Interest in AI-first products, agentic AI systems or intelligent workflow automation Growth mindset and commitment to ongoing professional development Ability to produce effective, reliable and clean code Positive and collaborative attitude to work Bonus Points Experience building BPM, workflow or low-code/no-code software platforms Experience with Docker, Kubernetes, AWS and/or CI/CD tools Experience working in a fast-paced start-up environment Experience working on AI products, agentic workflows, event-driven orchestration or automation-heavy systems Ability to deliver quickly, on time and at high quality What We Offer Competitive salary Hybrid working with team days in our Sydney CBD office Personal learning and development budget Flexible leave policy Expense policy and salary sacrifice options CBD start-up hub with snacks, drinks, premium coffee and team socials Company-wide social events and annual off-sites to locations like Australia, Bali and Korea Transparent, flat culture where questions and feedback are welcomed ‍ ‍