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About the Role

BigCommerce is building a new team to deliver a suite of conversational AI agents spanning the B2B commerce lifecycle. As a Senior Backend Engineer specializing in AI agents, you will design the agents themselves, including orchestration, sub-agent architecture, tool integration, prompt engineering, and evaluation. Agent quality is paramount, and you will own the evaluation practice for the team.

Responsibilities

• Design, build, and iterate on AI agents in Go/Python using an orchestrator/sub-agent architecture, covering intent interpretation, delegation, and safe action execution
• Own eval-driven development: build and maintain golden datasets, scorers, and regression suites for critical quality metrics
• Develop and refine prompts, model configurations; treat prompts and model settings as versioned, tested artifacts
• Integrate agents with MCP servers and backend tools, defining safe tool-call contracts, approval flows for write actions, and guardrails against prompt injection and abuse
• Instrument agents with tracing, metrics, and cost tracking; use production signals to drive quality improvements
• Collaborate with product designers and frontend engineers to deliver intuitive, useful conversational experiences
• Quickly build proof-of-concept agents to validate user stories, then harden them to GA quality
• Drive architecture decisions on ambiguous problems and mentor other engineers in agent engineering practices

Requirements

• 5+ years of experience in backend or full-stack software development, with hands-on experience building agentic AI/LLM applications
• Strong and proven development skills in any major language (Go/Python/Ruby/PHP)
• Experience working with LLMs (Gemini, Anthropic, OpenAI, etc.) in production systems
• Experience with LLM evaluation: building datasets, defining scorers/metrics, and using eval results to drive iteration
• Strong understanding of prompt engineering, tool/function calling, and agent orchestration patterns
• Deep experience designing and building APIs (gRPC, GraphQL, REST) and integrating data across systems
• Hands-on experience building MCP servers or LLM tool integrations
• Excellent problem-solving skills and ability to work in a fast-paced, exploratory environment
• Strong collaboration and communication skills in cross-functional teams
• Strong preference toward execution and delivery

Skills

• AI agents
• LLM applications
• Go
• Python
• Prompt engineering
• Agent orchestration
• API design
• gRPC
• GraphQL
• REST
• Conversational AI
• Natural language processing

Location

• Austin
• Atlanta

Work Type

• Hybrid

Experience Level

• Senior

Education Level

• Bachelor's degree in CS, EE, SW, CE, MIS; or equivalent experience

Salary/Compensations

• $116,000.00 - $195,000.00

Benefits

• Variable compensation (such as bonus or commission)
• Equity
• Benefits in accordance with local policies

About the Company

• Commerce, the parent company of BigCommerce, Feedonomics, and Makeswift, empowers businesses to innovate, grow, and thrive with its open, AI-driven commerce ecosystem.
• BigCommerce helps merchants increase sales at every stage of their growth, providing the leading e-commerce platform for startups, mid-market businesses, and enterprises.
• We are a group of clever, committed, curious people, unleashing talent in all we do.
• We believe in the power of togetherness, striving at the edge of what’s possible, impacting the lives of billions of people for the better.
• We Do Extraordinary–and that’s no small feat!
• Our people are our power. It’s only through dedication, collaboration, and inspiration that we can Do Extraordinary.
• We’re natural problem-solvers, champions of empowering businesses, and hungry learners.

Equal Opportunity

• At Commerce, we believe that celebrating the unique histories, perspectives and abilities of every employee makes a difference for our company, our customers and our community.
• We are an equal opportunity employer and the inclusive atmosphere we build together will make room for every person to contribute, grow and thrive.
• We are committed to creating an inclusive and accessible hiring experience for all candidates.
• If you require accommodations or adjustments at any stage of the recruitment process, please let us know and we will work with you to meet your needs.