Software engineering
Senior engineer. Distributed systems, backend, desktop — pragmatic, product-minded.
David Molnar — software · hardware · Bitcoin · open source
Software, hardware, and Bitcoin privacy tools.
Senior software engineer with 15+ years shipping distributed systems, embedded hardware, and Bitcoin privacy software. Former CTO at Wasabi Wallet, now working as an independent contractor on Ginger Wallet, Fetaphon, TESCO, AGIS, and more. Budapest, Hungary.
What I do
Embedded systems
Custom handheld devices from schematic through firmware — display, MP3/SD audio, Bluetooth, battery. Audio guides, wellness and bioresonance hardware, and other purpose-built electronics.
Bitcoin & privacy
Bitcoin privacy infrastructure. Former CTO at Wasabi Wallet, now lead dev on Ginger Wallet. Open-source protocols that respect the user.
3D printing & industrial parts
Functional parts — gears, enclosures, and custom branded pieces like fridge magnets, keychains, and promo items.
Smart home
Home Assistant, Homey, KNX — design, deployment, and advisory for smart-home systems.
Selected work
Former CTO ↗
W
Wasabi Wallet
Former CTO
Wasabi Wallet
Open-source Bitcoin privacy wallet. Six years as core contributor and CTO, 4,600+ commits, deep CoinJoin protocol work.
Lead developer ↗
G
Ginger Wallet
Lead developer
Ginger Wallet
Privacy-first Bitcoin wallet. Open source. Currently the architecture and core engineering.
Firmware & hardware ↗
F
Fetaphon
Firmware & hardware
Fetaphon
Medical device for expecting mothers — a battery-powered, handheld fetal heartbeat monitor. Full schematic and firmware.
Independent contractor
T
TESCO
Independent contractor
TESCO
Software development and engineering consulting for a European retail giant.
Independent contractor
A
AGIS
Independent contractor
AGIS
Security-systems integration work for enterprise clients.
Wasabi Wallet — Open-source Bitcoin privacy wallet. Six years as core contributor and CTO, 4,600+ commits, deep CoinJoin protocol work.
Ginger Wallet — Privacy-first Bitcoin wallet. Open source. Currently the architecture and core engineering.
Fetaphon — Medical device for expecting mothers — a battery-powered, handheld fetal heartbeat monitor. Full schematic and firmware.
TESCO — Software development and engineering consulting for a European retail giant.
AGIS — Security-systems integration work for enterprise clients.
Worked with
- Wasabi Wallet
- Ginger Wallet
- Fetaphon
- TESCO
- AGIS
- ADT
- Smartopert
About
I’m David Molnar, a senior software engineer based in Budapest. 15+ years shipping distributed systems, embedded hardware, and Bitcoin privacy software. I spent six years at Wasabi Wallet, eventually as CTO, building one of the most widely used Bitcoin privacy wallets — 4,600+ commits across the protocol and client. Today I work as an independent contractor on several parallel projects, including Ginger Wallet, Fetaphon, TESCO, and AGIS. I take on hard problems: protocol-level Bitcoin privacy, battery-powered embedded devices that have to run for years, and industrial parts with real tolerances.