Senior Software Engineer - AI Agent

The Role

What are the main responsibilities for this role?

• Build the core product and system architecture for a next-gen education agent
• Design and ship agentic workflows across planning, tool use, memory, evals, feedback loops, and production operations
• Own difficult engineering problems end to end, from prototype to production
• Build robust backend and infra foundations for AI-native products
• Work across the stack when needed, but go deep on backend systems and infrastructure
• Partner closely with product and design to turn ambiguous ideas into working products fast
• Push the team toward higher engineering leverage, better abstractions, and faster iteration loops

What skills and experience are required?

• Hardcore technical ability
• Strong full-stack skills, with especially deep experience in backend and infrastructure engineering
• The kind of engineer people describe as a 10x builder
• Strong product instinct, not just implementation ability
• Comfortable operating in ambiguity and moving with very high ownership
• Able to design clean systems, make sharp tradeoffs, and execute fast without lowering the bar
• Deep curiosity about AI agents, developer tooling, evals, orchestration, and how modern engineering is changing
• Real excitement for exploring and applying Harness Engineering, not just reading about it

Strong Plus If You Have

• Experience building AI agents, copilot-style products, workflows, or internal automation systems
• Experience with LLM application infrastructure, eval systems, retrieval, tool execution, or observability
• Experience building developer platforms, infra products, or backend-heavy systems at scale
• Startup experience, especially 0-to-1 product building
• Interest in education, learning systems, or personalized AI products

Why work for Crimson?

• Rapidly growing start up, with a flexible working environment where you will be empowered to structure how you work
• Limitless development and exposure - our internal promotions/role changes made up 33% of all recruitment last year
• $1000 individual training budget per year, we love to ‘Level Up’ (it’s one of our core values)!
• Psychologist on staff
• Insightful fireside chats and workshops to help support our high-performing and ambitious team
• Radical Candor is a feedback approach we live by
• We’re a global player with 28 markets (and growing) across the globe. Most roles have the option to work from one of our many offices or remotely!

If you're passionate about growing in a fast-paced, collaborative environment and want to work with cutting-edge technology, then we'd love to hear from you!