Sr. Full Stack Engineer

Peek is the operating system powering the experiences industry - from museums and attractions to tours and activities. With over $7B in bookings, Peek’s AI-powered platform has helped thousands of merchants to increase revenues, save time, and deliver seamless guest experiences. Customers include MoMA, Whitney Museum, Seattle Aquarium, Bryant Park & Looping Group. The company has raised over $150 million from institutional investors Westcap, Goldman Sachs, and SpringCoast Partners. Learn more at www.peek.com http://www.peek.com. As a remote-first company recognized by Forbes as one of America's Best Startup Employers and by Built In as a 2025 and 2026 Best Place to Work, we are a global team of "Peeksters" who "Obsess Over Our Customers," "Accomplish Big Things," "Collaborate With Purpose," and "Get Better Every Day. THE ROLE Do you love crafting beautiful and functional customer experiences? Want to work on interesting technical problems around booking flows and payments? Do you have a passion for Elixir and functional programming but also love building complete experiences end to end? Peek is looking for a Senior Full Stack engineer. The ideal candidate has 5+ years of development experience with Elixir, experience working with GraphQL APIs, and enjoys building frontend user experiences with TypeScript (familiarity with Ember.js is a bonus). In this role you will have the opportunity to take ownership of critical product areas and use AI tools as a force multiplier on top of your strong fundamentals. Our engineering group works on several different products and systems: our Peek Pro operations management suite, embeddable scheduling & booking flows, and custom development services for our enterprise customers. This role will primarily focus on the Customer Experience (B2B2C) side of the business, including building an elevated user experience in a new and improved greenfield booking flow, but with ample opportunity to expand in breadth to other areas of the product. We’re hiring a Senior Full Stack Engineer who works AI-first. That means you treat AI as a core part of how you build, break down ambiguous problems, delegate to agents, review their work critically, and course-correct when things go sideways. You'll design and operate complex agent orchestration systems, develop patterns for human-agent collaboration, and ship real product features primarily through agent-assisted development in collaboration with human colleagues. We work collaboratively, move fast, and value technical quality. If you are excited about the challenge of building an incredible product while working alongside a great engineering team, we’d love to hear from you! What we’re looking for - Strong backend fundamentals in Elixir: API design, data modeling, SQL, service reliability, and debugging production issues. - Passion for crafting flawless user experiences: enthusiastic to closely follow design mockups, “customer experience first” mentality, well-tested code is a top priority - bugs in production keep you up at night. - A holistic view of development and complexity: ability to identify and bridge the gap between frontend and backend complexity. - Adaptability to the changing tech industry: demonstrated daily use of AI coding tools (Claude Code, Codex, Cursor or equivalent) in a production engineering workflow. - Ability to critically evaluate AI-generated code: you catch logic errors, identify security issues, assess maintainability, and own what gets merged regardless of how it was written. - Strong system design instincts: you think about tradeoffs, edge cases, and what happens when things scale or fail. - Clear and empathetic communicator: you flag when a spec has holes, you can articulate why you made a technical choice, you enjoy collaboration and seek to understand different perspectives, and you are constructive in any disagreements. - Self-motivation and ownership: you will push your work forward without prompting and look for ways to unb