Senior Fullstack Developer (Product Builder)

We're TomFit, an AI-native physical health provider, building our own training machine and studios, scaling out of Zürich.

Our strength training machine, the TomBot, works with a software platform and AI to give people a training regime that actually adapts to them; integrated diagnostics tailor every exercise to the user. Hardware, software, and intelligence in one product - built by a team of 25 across engineering, product, and operations, running three hubs with more than a dozen machines deployed.

We work AI-first. No tickets, no handovers: one developer leads an initiative from problem to release, and AI multiplies what one person can do. In charge, not alone - you have a product owner as your first stop, specialists who set standards and review, and colleagues who contribute.

That is where you come in. We are looking for a senior fullstack developer who builds products, not features. You hear a business problem, come back with "here are three ways to solve this, I recommend B because...", then build it, ship it, and present the outcome - across the apps our members train with, the backend that runs our hubs, and the machine they train on.

What you will do

• Own initiatives end to end - from problem to shipped product, including scope, technical design, implementation, quality, and release readiness.

• Build across the stack - backend services, web and mobile apps, and the integration with the TomBot and its sensor data.

• Work AI-first - use AI daily across design, coding, testing, and analysis, and keep raising your own leverage as the tools evolve.

• Lead, don't solo - pull in design, QA, machine development, and your product owner when the feature needs them. You stay accountable; asking for help is leading, waiting is not.

• Know the product - train on the machine, watch real sessions, and understand our members and market well enough to challenge requirements.

A few things we'll need from you

• You are an experienced fullstack engineer who can show us real products you have worked on. Ideally, you have built products with a hardware component.

• Our current stack is Java, React, Flutter, and Kotlin Multiplatform - no need to be an expert, but you should be comfortable diving into them all.

• You work AI-first already: real hands-on experience building with AI as a daily practice, beyond prompting into workflows and automation. Experience building AI-based features is a plus.

• You take ownership: you propose solutions instead of asking what to build, and you drive topics to closure.

• You can work on-site with us in Zürich Stettbach or Kraków. This is an on-site role because the product is physical. You will test directly with the TomBot, observe training sessions, work with sensor data, and iterate with the team in the studio.

• Excellent English. German is a big plus.

What we offer

• An inspiring mission - we want to bring physical health to everyone.

• Real ownership with real backup - you run your initiatives end to end, with an owner who unblocks you and a team that has your back.

• Short paths - no layers of process between an idea and something real people train with.

• An AI-first environment where learning every day is part of the job.

• Entrepreneurial spirit and a culture of trust.

• Competitive compensation.