Wojciech Pasternak
@wojciechpasternak
Senior backend engineer specializing in scalable Ruby on Rails systems and distributed teams.
PolandWhat I'm looking for
I am a senior backend engineer with 18+ years of hands-on software development experience, focused on Ruby on Rails, PostgreSQL, REST, and GraphQL APIs. I design scalable systems and lead distributed teams with an emphasis on clean code and pragmatic architecture.
At zero44 I led the implementation of a core ETS trading platform and accounting ledger enabling compliance with EU CO₂ regulations, integrating data from ~500 vessels and 20+ external APIs. I collaborate on system architecture and mentor developers while supporting hiring and delivery strategy.
As a senior engineer at Toptal I built internal tools adopted by 200+ engineers, extracted billing domains into dedicated services, redesigned GraphQL APIs, and implemented Kafka-based asynchronous messaging. I drove performance tuning, infrastructure improvements, and developer productivity tools.
Previously I led distributed teams (~15 engineers) through hypergrowth, introduced Agile/Kanban and CI/CD practices, reduced manual compliance effort by 40%, cut onboarding time by 50%, and maintained 0% turnover during my tenure. I prioritize inclusive culture, measurable delivery improvements, and technical leadership.
Experience
Work history, roles, and key accomplishments
Staff Backend Developer
zero44
Mar 2023 - Present (2 years 7 months)
Designed and led implementation of the core ETS trading platform and accounting ledger enabling maritime fleet operators to comply with EU CO₂ regulations; integrated APIs ingesting 50K+ daily records from ~500 vessels and aggregated data from 20+ external sources.
TOExtracted billing domain from a monolith into dedicated services, redesigned GraphQL APIs (>100 types) and implemented Kafka-based asynchronous messaging to improve decoupling and scalability.
TOLed distributed teams of ~15 engineers, implemented scalable hiring and delivery processes, cut manual compliance checks by 40% and reduced onboarding time by 50%, achieving 0% turnover during tenure.
Senior Backend Developer
Various Employers
Jan 2006 - Dec 2011 (5 years 11 months)
Developed backend platforms across healthcare, pharma, and IaaS, focusing on performance, metrics, DevOps, API design, and product redesign initiatives.
Education
Degrees, certifications, and relevant coursework
CTCracow University of Technology
Master of Science, Computer Science
2001 - 2006
Completed a Master of Science in Computer Science at Cracow University of Technology, focusing on software engineering and systems development.
Tech stack
Software and tools used professionally
Availability
Location
PolandAuthorized to work in
Job categories
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