Alexey Berezin
London, England, United Kingdom
Summary
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RockstarAlexey Berezin is a Senior Software Engineer based in London with 11 years of experience building high-throughput video and web applications across companies like Bloomberg, DAZN, Joyn and Yandex. He specializes in player engineering and connected-device video stacks, contributing to products serving millions of monthly active users while driving test automation and reliability improvements. A strong TypeScript practitioner, Alexey is an active open-source contributor to projects such as ts-essentials—where he crafts advanced type utilities—and has added targeted tests to widely used libraries like hls.js and nanostores. He blends deep frontend typing expertise with pragmatic QA engineering, improving developer DX and runtime robustness. Educated with an MSc in Software Engineering, he holds UK Global Talent recognition and often operates at the intersection of tooling, types, and media playback systems.
11 years of coding experience
Stackoverflow
566reputation
43kreached
22answers
5questions
Github Skills (21)
unit-testing10
javascript10
type-check10
testing10
typescript10
essentials10
type-system10
typescript-types10
hlsl10
type-checking10
typescripts10
swift6
haskell6
dictionary6
sml6
Programming languages (12)
Github contributions (5)
ts-essentials/ts-essentials
Jul 2021 - Jan 2023
All essential TypeScript types in one place 🤙
Role in this project:
Full-stack Developer
Full-stack DeveloperContributions:1 release, 205 reviews, 94 commits in 1 year 5 months
Contributions summary:Alexey primarily contributed to the project by adding and refining TypeScript types. They implemented new types for various utilities, including `MergeN`, `StrictExtract`, `DeepPartial`, and `DeepReadonly`. The user also focused on improving and expanding existing type definitions, such as `IsTuple`, and made adjustments to existing type utilities in the `lib/types.ts` file. These changes aimed to improve type safety and developer experience within the project.
typescript-typestypescripttype-level-programmingtoolbox
nanostores/nanostores
Aug 2021 - Dec 2021
A tiny (340 bytes) state manager for React/RN/Preact/Vue/Svelte with many atomic tree-shakable stores
Role in this project:QA Engineer / Test Automation Engineer
QA Engineer / Test Automation EngineerContributions:7 commits, 3 PRs, 3 comments in 3 months
Contributions summary:Alexey primarily contributed to the project by adding and modifying test cases. They focused on testing the `create-map` functionality, including its `setKey` and `notify` methods, ensuring correct typing and error handling. Their work involved adding specific test types and validating the behavior of the code with different inputs, demonstrating a focus on code quality and robustness.
preactreactsveltevue
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