Oleg Goncharov
I build digital tools with a point of view.
Browser extensions, mobile apps and desktop utilities for everyday friction — designed, shipped and kept useful.
Focus
From a sharp idea to a useful product
Small interfaces, clear feedback loops and products that respect people’s attention.
Stack
Web · Flutter · C++
The right technology for the job, with craft in the details.
Rhythm
Build → test → ship
Public releases, closed betas and thoughtful iteration.
Systems engineering
Twenty years of C++ in production
A decade of it on a cryptographic SDK for browsers: one abstraction over seven cryptographic providers and three hardware-token families through PKCS#11, deployed at a national-scale digital government-services platform and a major bank, serving 50,000+ active users.
Performance
8s → 1.2s
Thread pools, async operations and SQLite-backed caching cut cold start by 85% and took throughput from 50 to 200 operations per second.
Cross-platform
92% shared code
One codebase across Windows, Linux and macOS including Apple Silicon, down to the cryptographic layer and custom OpenSSL patches.
Open source
C++ portfolio
Nine public repositories, each building and testing on Linux, Windows and macOS in GitHub Actions.
Open source
pkcs11-cpp
Hardware tokens and smart cards through PKCS#11.
View on GitHub ↗Open source
cryptographic-techniques-cpp
Cryptographic primitives implemented from their specifications, with zero third-party dependencies.
View on GitHub ↗Open source
parallel-cpp
Concurrency building blocks: thread pool, lock-free queues, CUDA examples.
View on GitHub ↗Open source
protocols-cpp
WebSocket, TCP/IP, MQTT, gRPC, CoAP and native messaging.
View on GitHub ↗Open source
code-snippets-cpp
Lock-free data structures, coroutines and concurrency patterns.
View on GitHub ↗Open source
idioms-cpp
Modern C++ idioms, each with a runnable example.
View on GitHub ↗Browser extensions
Selected work
A growing shelf of practical digital products.
Published
Web Privacy
One-click browser cleanup and privacy tools, processed locally.
Open in Chrome Web Store ↗Published
QuickLink Copier
Copy the current page, keep history, move faster.
Open in Chrome Web Store ↗Published
QR Code Generator
Create QR codes for URL, Wi‑Fi and vCard data.
Open in Chrome Web Store ↗Mobile applications
Ole Buddy line
Ole English Buddy is live on Google Play. Ole Voice Buddy and Ole Proger Buddy are in closed testing.
Google Play
Ole English Buddy
Offline English trainer with cards, exams and accent practice.
Open in Google Play ↗Closed beta
Ole Voice Buddy
Voice training app — currently in closed testing.
Store link to be updatedClosed beta
Ole Proger Buddy
Programming companion — currently in closed testing.
Store link to be updatedFind me online
Have a useful idea?
Let’s make it clear, calm and real.