Senior Fullstack Engineer (m/f/d) - AI Health tech

voize

Warsaw, Poland
Hybrid
Senior Level
Posted 20 Oct 2026

Skills

Required

Kotlin
HIPAA
JVM
backend
GDPR
BAA

Preferred

data exploration
ML App
ML training orchestration
model evaluation
EKS
data labelling
ML-issue triage

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.

About voize

🎤 Why voize? Because we’re more than just a job!

Today, that time is lost to busywork and complex systems that pull them away from what matters most:

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.

$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!

We foster an open, collaborative culture with regular team events, whether you work from our Berlin office or remotely

We look forward to your application and can’t wait to meet you – no matter who you are or what background you have!

Requirements

Excellent Kotlin (or JVM) backend experience
Demonstrated ownership of a complex, production-critical system Comfortable engineering with regulated / sensitive data (HIPAA, GDPR, BAA, PHI, or similar)

Preferred

Design and ship features for data labelling, data exploration, ML training orchestration, model evaluation, model playgrounds, and ML-issue triage

Drive the next iteration of in-house annotation tooling

UX, throughput, task-type extensibility - to the bar where vendor revisits are unnecessary
Maintain CI/CD, EKS deploys, and LGTM-stack observability for ML App; triage and fix defects
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
services, ETL/data pipelines, schema design
Strong product / UX instincts (annotation, labeling, data exploration, ops UI)

Benefits

At voize, we believe the greatest gift to frontline workers is time - time to care, connect, and be present.
Co-own the ML App codebase (React/TS SPA + Kotlin services + Kotlin ETL on EKS)

5+ years building production fullstack web apps with

🌱 Growing together - what you can expect at voize
We are a fast-growing startup, that means you will tackle challenges, grow quickly, and make a real impact, giving frontline workers more time for people
Become a co-creator of our success with stock options
You decide when you work best, that means flexible working hours and a good hybrid set-up.