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
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 updatedDesktop application
Ole Disk Buddy
Offline disk-space analysis with a safety-first cleanup workflow.
In progress
Multithreaded scanning, radial and treemap visualizations, duplicate detection, storage history, privacy scan, reports and an Undo Vault for recoverable cleanup.
View project on GitHub ↗Find me online
Have a useful idea?
Let’s make it clear, calm and real.