Sergey Efremov
Lead Software Engineer at Amenitiz
Barcelona, Catalonia, Spain
Summary
👤
Senior🎓
Top SchoolSergey Efremov is a Lead Software Engineer based in Barcelona with 14+ years of hands-on experience designing and scaling full-stack web applications across startups and product companies. He has led engineering teams at Amenitiz and Student Loan Hero, driving frontend and backend optimizations and shipping data-driven features that improved conversion and performance. His background spans Ruby on Rails, Node.js, React and DevOps on AWS, with early adoption of technologies like Neo4j and custom SVG tooling at ResumUP. Sergey combines team leadership with deep implementation skills—moving between code, architecture and deployment—and has a track record of lifting legacy stacks and introducing modern tooling. Trained in mathematics and programming at Saint Petersburg State University, he brings a quantitative mindset to product-focused engineering. An understated strength is his consistent pattern of transitioning from senior engineer to lead roles, reflecting both technical depth and people leadership.
13 years of coding experience
14 years of employment as a software developer
masters, mathematics, programming, masters, mathematics, programming at Saint Petersburg State University
English, Russian, Dutch, Spanish
Stackoverflow
1reputation
0reached
0answers
0questions
Github Skills (39)
plugin10
user-feedback9
multithreading9
foursquare9
capistrano9
wordpress9
wordpress-plugin9
sinatra9
netsuite9
rack9
react8
traffic8
php8
ruby8
archived8
Programming languages (3)
Github contributions (5)
EvilFaeton/tire_async_index
Mar 2013 - Feb 2014
Contributions:38 commits in 10 months
resqueindextiresidekiqupdate
EvilFaeton/linkedin
Aug 2015 - Jul 2018
Contributions:3 pushes in 2 years 11 months
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