Igor Stolyarov

Numbers don’t lie. Here’s what I delivered in my last review period alone:
DB size 460 GB → 150 GB · favorite response 3000 ms → <700 ms · 5x faster saved searches cron · 40% → 60% test coverage · dozens of A/B tests on millions of users.

I don’t just write code — I move metrics that matter. Read on for the full breakdown.

Key results & achievements:
Performance & cost optimisation – reduced saved searches database usage from 460 GB to 150 GB; cut favorites response time from 3000 ms to <700 ms; sped up a cron job by 5×.
Testing & reliability – increased test coverage of favorites-composition service from 40% to 60%; fixed multiple prod bugs, significantly reducing on‑call interruptions.
A/B testing at scale – launched and rolled out dozens of experiments on millions of users, delivering measurable business impact:
- XL snippet redesign: DTB +0.22%, CPC revenue +1.2% (+19.5M RUB/month)
- Grid layout for mobile snippets (Goods & Baby products): DTB +3%, CPC revenue +1.6%
- SPA rollout: DTB +0.06%, extra CPC revenue +1.7M RUB/month
- Contact hiding for logged‑in users (Goods): DTB +23.4% (exposure), TNU +16.6%
Platform & architecture – built MVP library for server‑side Beduin rendering with real‑time alerts and Grafana dashboards; contributed to refactoring of legacy search service; led migration to unified snippet platform (item‑snippet) on SERP and main feed (Android, iOS, MAV, Desktop).
Technical leadership – acted as feature lead for multiple initiatives (snippet platform, filtered listings, favourites improvements); owned service favorites-composition; conducted decomposition of large product tasks into shippable increments.
Go & AI tooling – develop in Go using modern AI assistants (Codex, Claude, GPT, GLM, Qwen) to optimise pipelines and reduce costs.
Additional roles – Security Champion (III level), interview engineer for programming section, scrum‑master activities (dailies, PBR, retros), organised team offsites and merch.

Technologies used:

• GO (golang)
• Microservices
• Backend Driven UI
• Backend
• e-commerce
• AI

Сasual hit Woodoku — millions of players. Here’s how I made it faster, stickier, and more profitable.

Key achievements & responsibilities:

• Performance optimisation – optimised highly loaded game map rendering, significantly reducing frame drops and improving battery efficiency on low‑end devices.
• User engagement & retention – implemented local notifications, flexible popups, bubble tiles, and rocket power-up (board cleaning), contributing to higher DAU and session length.
• Knowledge sharing – spoke at internal company meetups, sharing best practices on optimisation, tooling, and release automation.
• Deep linking & support – built a deeplinking system to route players to specific in‑game content; integrated Zendesk for seamless customer support, reducing ticket resolution time.
• Monetisation & store releases – managed release processes for Amazon Appstore integrated with MAX SDK (mediation); created playable ads to boost user acquisition campaigns.
• Editor tooling & build automation – developed a Unity editor tool to batch-update fonts across the project; wrote custom build steps on the build machine, streamlining release pipelines.
• Prototyping & BA involvement – implemented numerous prototypes to validate game mechanics; participated in BA processes to align technical execution with product KPIs.
• Release management – owned end-to-end release coordination across platforms, ensuring timely and stable updates.

Technologies used:

• C#
• Unity 3D
• Zenject
• Dotween
• Engineering

- Client & Server side of realtime multiplayer mobile game - Overball
- Implement leagues system
- Implement characters upgrade system
- Implement matchmaking system
- Implement like in MOBA games ability system
- Implement A/B test system
- Implement analytics system
- Implement telegram bot to watch & control our game server
- Implement telegram blackjack game-bot on blockchain
- Implement DB infrastructure for Overball
- Mobile UI interactions & optimization on low-end devices
- Ported physics engine Box2D C++ lib to C#
- Develop some hyper casual games in internal company hackathon's

Technologies used:

• C#
• Multiplayer
• Java
• Unity 3D
• Rider
• Telegram
• BOX 2D
• SQL

I worked on manufactory software for aviation industry on CJSC "Aviastar-SP"

Achievements

- Implement client-server solution to generate tool setup's for airplanes
- Implement documents printing from DB
- Received 3 certificates of State registration of computer programs
- Implement different tools for internal purposes
- Implement libs to extend existed software

Technologies used:

• C# 2.0
• Windows
• WPF
• SQL

- Full cycle of game developing for mobile devices
- Implement AD mediation component
- Implement auto-generated levels for platformer game
- Implement inApp component
- Integrate a lot of external tools
- Publish games to Google Play Store
- Publish apps and games to Microsoft Store

Technologies used:

• Unity 3D
• C#
• Visual Studio
• Mono
• Java
• Android Studio