About
From circuit boards to Flutter apps.
RSApps is Ryszard Schossler, a senior Flutter engineer based in Rzeszów, Poland. He holds an M.Sc. in Mechatronics from the University of Rzeszów, started out on mobile and embedded software for R&D IoT projects, and has more than six years of experience.
That background still shapes the work. Hardware teaches you to plan for failure, measure before you optimise and write things down. It is also why RSApps can deliver an IoT product as one project: the firmware, the backend and the app.
RSApps has been an independent consultancy since October 2023. Some of the work comes through software houses; clients can also work directly with the engineer who does it.
Rzeszów, Poland · remote · English (C1) / Polish (native)
The path so far
- 2020 — 2023Software engineer at Signum: mobile and embedded software for R&D IoT projects
- 2022 — 2023Research and teaching assistant at the University of Rzeszów: labs on programming and internet technologies
- Oct 2023RSApps founded as an independent consultancy
- 2023 — 2024Omega Pilzno logistics driver app, via Appwise
- 2024Flutter team lead on Signalink for Speednet; security audit for Smart City Poznań
- 2024 — nowSole developer of the Bodyspace app
- 2024 — 2026Core contributor to IOHK Catalyst Voices
- 2026Three subsidised R&D IoT projects for Signum
- 2026 — nowEnterprise Flutter Web for SFP Info and Niveau Deuren, via Sienn
Way of working
One engineer, full ownership
The person on your first call is the person who writes the code. Nothing gets lost in handovers.
Written first
Proposals, architecture decisions and handover notes are all written down, so you never depend on one person’s memory.
Weekly and visible
A demo every week, a test build you can install, and a short changelog.
You own everything
Your repository, your store accounts, your cloud. RSApps works inside them.
$ ls ~/tools
mobile/
Flutter · Dart · BLoC/Cubit · Riverpod · go_router · Widgetbook
architecture/
Clean Architecture · Melos monorepos · white-label
backend/
Supabase · PostgreSQL · Serverpod · Firebase · MQTT
delivery/
Codemagic · GitHub Actions · Shorebird · PostHog · Crashlytics
hardware/
ESP32 · C++ (Arduino) · MicroPython
ai/
Claude Code · MCP