Senior / Principal Demo Engineer

About the role

Fin is looking for a founding Demo Engineer to build the infrastructure and tooling that powers AI agent demonstrations for our global sales team. You will design the environments, data sets, and reset mechanisms that allow our Solutions Engineers to showcase our product reliably and effectively. This role sits at the intersection of product engineering, go-to-market strategy, and enablement, serving as a force multiplier for the entire field organization.

Key facts

What you'll do

• Manage the end-to-end demo platform, including multi-tenant mock workspaces, configuration, and automated reset infrastructure.
• Develop internal features and workflows that enable Solutions Engineers to generate and customize demo accounts rapidly.
• Use AI models to synthesize realistic prospect data, org structures, and conversation scenarios for specific industry verticals.
• Create templates and scripting hooks to help the team build complex demo scenarios while maintaining safety guardrails.
• Ensure demos accurately reflect the product across all surfaces, including web messengers, mobile SDKs, voice, email, Slack, and API workflows.
• Collaborate with the enablement team to build training materials, demo libraries, and certification paths.
• Partner with product teams to ensure demo capabilities are ready for new product launches.
• Codify field patterns into reusable tools and playbooks for the broader go-to-market team.

Requirements

• 6+ years of experience in customer-facing technical roles such as Solutions Engineering, Developer Relations, or as a Founding Engineer.
• Hands-on experience building with LLMs, including knowledge of RAG, tool use, agentic workflows, and model evals.
• Full-stack technical proficiency: TypeScript for front-end work and at least one back-end language (Ruby, Go, or Python).
• Experience working across web and mobile platforms (iOS, Android, or React Native).
• Deep familiarity with SDKs, wrappers, and RESTful SaaS APIs.
• Proven ability to increase personal productivity using agentic coding tools like Claude Code.
• Strong design sensibility and the ability to craft compelling, high-impact product narratives.

Nice to have

• Experience in customer support, contact center, or CX software.
• Background building internal platforms or developer tools at scale.
• Experience designing multi-tenant sandbox environments using synthetic or anonymized data.
• Prior work bridging engineering and revenue-generating teams.

Skills & tools

• TypeScript, Ruby, Go, Python
• LLMs, RAG, Agentic workflows
• RESTful APIs, SDKs
• iOS, Android, React Native
• Multi-tenant architecture

Practical notes

• Benefits include comprehensive medical, dental, and vision coverage, 401k with match, flexible paid time off, and paid parental leave.
• Compensation is reviewed regularly and includes meaningful equity in the form of RSUs.
• Fin operates under a hybrid work policy requiring at least three days per week in the office.
• The company maintains a neutral stance on social and political topics to focus on core business objectives and internal culture.