Fullstack Engineer
Posted 7 Oct 2026
Advertised as “Senior Fullstack Engineer (m/f/d) - AI Health tech”
BranchFactor Summary
The original posting with the fluff stripped out
- Management level
- Individual contributor
- Employment
- Remote
- Contract
- Contract
No salary listed for this role.
🎤 Why voize? Because we’re more than just a job!
At voize, we believe the greatest gift to frontline workers is time - time to care, connect, and be present. Today, that time is lost to busywork and complex systems that pull them away from what matters most: people.
Our vision is to change that by building AI companions that seamlessly take over digital workflows. We don’t replace humans with technology - we amplify their impact.
Our mission is backed with a $50M Series A funding led by Balderton Capital, with support from HV Capital, Y Combinator and other leading VCs. Today, 2,000+ facilities trust voize, and over 200,000 users rely on our AI companion to ease their daily workload.
As a dynamic team, we combine first-in-class technology with meaningful social impact. And now, we’re looking for you to join us on this mission!
💡 Your Mission
As a Senior Fullstack Engineer - Freelance at voize, you will be a co-owner of voize's ML App - the in-house platform for annotation, data exploration, ML training orchestration, model evaluation, and the HIPAA-bearing data flows that move PHI from customer to model. Make in-house tooling good enough that revisiting Labelbox/Encord-style vendors is permanently off the table, and unblock HIPAA-compliant training on US customer data.
🚀 Your Daily Business - No two days are alike
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Co-own the ML App codebase (React/TS SPA + Kotlin services + Kotlin ETL on EKS)
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Design and ship features for data labelling, data exploration, ML training orchestration, model evaluation, model playgrounds, and ML-issue triage
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Drive the next iteration of in-house annotation tooling - UX, throughput, task-type extensibility - to the bar where vendor revisits are unnecessary
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Maintain CI/CD, EKS deploys, and LGTM-stack observability for ML App; triage and fix defects
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Pair with the Platform team on platform-side prerequisites (FGA proxy, OIDC) that the new training flows depend on
🤝 Your Skillset - What you bring to the table
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5+ years building production fullstack web apps with React + TypeScript
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Excellent Kotlin (or JVM) backend experience - services, ETL/data pipelines, schema design
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Demonstrated ownership of a complex, production-critical system