jozefowicz.dev

I build small iPhone apps for health, focus and better thinking.

I'm Radek, a senior software engineer from Wrocław, Poland, working on serverless and regulated software by day. On the side I build indie iPhone apps and web products, and run AWS & serverless trainings.

See my apps →See all my apps →
Radek Jozefowicz

iPhone apps

Apps I build and use

Hang app icon

Hang

A dead-hang tracker for grip strength, with history, streaks, goals and reminders.

Coming soonLearn more →

More apps at apps.jozefowicz.dev →

Web products

Websites

DebateAI

Become a Truth Seeker

Watch GPT-5, Claude, Grok, and DeepSeek clash on any topic. No single AI bias — truth surfaces from the collision.

Visit debateai.app →

Life Protocol

The healthy-aging basics, measured and trained

Free in-browser tools, plus private iPhone apps for movement, grip, nutrition, supplements and an AI advisor that sees the whole picture.

Visit lifeprotocol.club →

My story

From enterprise Java to my own apps

Enterprise foundations. I spent my first years inside large enterprises: global IT services, telecom, banking and automotive. Keeping business-critical systems running for major customers, modernizing legacy platforms and learning how big organizations actually ship software.

Since 2017: serverless and regulated domains. Most of my work since then has been cloud-native and serverless, much of it in regulated domains: eQMS (electronic quality management systems), software as a medical device (SaMD) and medical IoT, often with startups building their first regulated product, plus industrial IoT for plant reliability. That's where validation, traceability and audit-ready engineering became the default way I build.

Teaching. I've run cloud and serverless trainings and workshops for engineering teams since 2019, and I speak at meetups in Wrocław.

Today. By day I still work as a senior engineer and tech lead on regulated software. After hours I build my indie projects in public: small iPhone apps for biohacking and productivity, with on-device data and privacy first.

Consulting & trainings

Trainings & workshops for your team

I've worked with Java 8+, Spring, JavaScript, TypeScript, React, React Native, GraalVM and AWS Cloud. I believe in polyglot programming and persistence, and I'm a huge fan of serverless architecture.

  • Java 8+
  • Spring Framework (Security, Data, Cloud…)
  • Spring Cloud Function
  • React Native
  • Application development on AWS
  • Serverless architecture
  • Serverless Framework
  • GraalVM
Ask about a training

Feedback (in Polish)

Świetne szkolenie i genialny prowadzący.Spring Security
Bardzo fajny warsztat i ciekawie przeprowadzony.Spring Security
Dość mocne szkolenie, widać że przelegent fajne przygotował się: tzn. środowisko, sami zadania, zadania dla pracy samodzielnej.Spring Security
Jeszcze raz bardzo dziękuję, dobra nauka o lambdach, dużo się nauczyłam. A poza tym zawsze chciałam więcej pobawić się w konsoli AWS i co raz więcej wiem na ten temat, to teraz ladnej można robić jakieś eksperymenty.Serverless Framework
Jeszcze raz dziękuję za warsztaty. Bardzo mi się podobała aplikacja którą przygotowaliśmy oraz sposób w jaki poprowadziłeś warsztaty.Wprowadzenie do Serverless w chmurze AWS

Talks

Meetup talks

  • Serverless Wrocław meetup #6 — Low-level AWS REST API
  • Wrocław JUG — AWS Lambda, Java and cold starts
  • J/vacon — Wrocław J/va Meetup #4 — Java and serverless
  • Serverless Wrocław meetup #9 — Custom runtime: how to create one and why?

Contact

Let's talk

Questions about an app, a training, or a project? Drop me a line.

[email protected]GitHubLinkedIn