Senior Developer

Foundant + smartsimple

About The Position

This role is for a Senior Developer who will be responsible for designing and building working prototypes that real users can interact with. The developer will run fast experiments, put them in front of users quickly, and make clear decisions about what to do next. The role requires working across the full stack (frontend, backend, APIs) without being blocked by layer boundaries and specific technologies. The developer will contribute ideas and shape what the team builds, not just how it's built. They will share work early, learn out loud, and move on when evidence suggests it. This role is not suitable for individuals who prefer clearly defined requirements, specialize in a single layer, or prioritize production-grade code above all else.

Requirements

Senior-level engineering experience with broad technical range
Comfortable working from a hypothesis rather than a detailed spec
A bias toward speed - you know when good enough is good enough
Genuine curiosity about users and why they behave the way they do
The ability to stay unattached to your own work when the evidence points elsewhere
Fluent with AI-assisted development. You've built real workflows around tools like Copilot, Cursor, or Claude and use them to move meaningfully faster, not just as an autocomplete

Responsibilities

Design and build working prototypes (not mockups) that real users can interact with
Run fast experiments, put them in front of users quickly, and make clear decisions about what to do next
Work across the full stack - frontend, backend, APIs - without being blocked by layer boundaries and specific technologies
Contribute ideas, not just implementations. You'll shape what we build, not just how we build it
Share work early, learn out loud, and move on when the evidence says to