Sergei Radchenko
Senior Software Engineer at Dun & Bradstreet
Tallinn, Harju County, Estonia
Summary
👤
Senior🎓
Top SchoolSergei Radchenko is a seasoned senior software engineer based in Tallinn with over 16 years of professional experience and more than 20 years building web applications end-to-end. He blends full-stack development (Symfony, Node) with system design, infrastructure hardening, data extraction and analysis, and hands-on security testing—often wearing the architect, devops and UX hats on the same project. As owner of BlackCrystal Ltd. and a long-term contributor to enterprise data systems (Dun & Bradstreet, Bisnode), he delivers practical, production-grade solutions that emphasize reliability, SEO and measurable UX improvements. Comfortable with legacy and modern stacks alike, he also has a background in prepress and hardware maintenance, which gives him an uncommon appreciation for operational resilience and attention to detail. His personal motto, “Show what you can. Learn what you don’t,” reflects a pragmatic, continuous-learning approach to solving complex web and data problems.
16 years of coding experience
13 years of employment as a software developer
Show what you can. Learn what you don't., Show what you can. Learn what you don't. at School of LifeTallinna Kopli Ehituskool
Russian, English, Ukrainian, php
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (48)
doctrine10
telegram10
converter9
markdown9
telegram-bot9
commonmark9
php9
swiftmailer9
html9
cryptocurrency7
ton7
blockchain7
ubuntu6
monorepo5
symfony5
Programming languages (8)
Github contributions (5)
BlackCrystal/symfony1
Jun 2021 - Feb 2024
Fork of symfony 1.4 with DIC, form enhancements, latest Swiftmailer, better performance, composer compatible and PHP 7.0 support
Contributions:8 PRs, 9 pushes, 1 branch in 2 years 8 months
better-performancemailerphpsymfony-bundledic
BlackCrystal/doctrine1
Mar 2017 - Jan 2023
Doctrine 1 Object Relational Mapper
Contributions:2 PRs, 10 pushes, 3 branches in 5 years 11 months
relationalphpmapperobject-relational-mapperdoctrine
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