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I am a seasoned software and data engineer with 18+ years of experience coding for a living and for fun. I have extensive analytical skills and a strong foundation in computer science and software development, including object-oriented design, functional programming, data structures, operating system internals, and algorithm design and complexity analysis. I am a team player with a strong leadership and business-value oriented mindset, focusing on technical excellence and managing technical debt. I make data- or experience-based decisions between short- and long-term trade-offs, and I actively listen to diverse perspectives to advocate for product ownership and user outcomes.…I am a seasoned software and data engineer with 18+ years of experience coding for a living and for fun. I have extensive analytical skills and a strong foundation in computer science and software development, including object-oriented design, functional programming, data structures, operating system internals, and algorithm design and complexity analysis. I am a team player with a strong leadership and business-value oriented mindset, focusing on technical excellence and managing technical debt. I make data- or experience-based decisions between short- and long-term trade-offs, and I actively listen to diverse perspectives to advocate for product ownership and user outcomes.

Beniamin Hławiczka

Full Stack Developer, Back-End Developer, Web Developer, +2

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I am a seasoned software and data engineer with 18+ years of experience coding for a living and for fun. I have extensive analytical skills and a strong foundation in computer science and software development, including object-oriented design, functional programming, data structures, operating system internals, and algorithm design and complexity analysis. I am a team player with a strong leadership and business-value oriented mindset, focusing on technical excellence and managing technical debt. I make data- or experience-based decisions between short- and long-term trade-offs, and I actively listen to diverse perspectives to advocate for product ownership and user outcomes.…I am a seasoned software and data engineer with 18+ years of experience coding for a living and for fun. I have extensive analytical skills and a strong foundation in computer science and software development, including object-oriented design, functional programming, data structures, operating system internals, and algorithm design and complexity analysis. I am a team player with a strong leadership and business-value oriented mindset, focusing on technical excellence and managing technical debt. I make data- or experience-based decisions between short- and long-term trade-offs, and I actively listen to diverse perspectives to advocate for product ownership and user outcomes.

Available to hire

I am a seasoned software and data engineer with 18+ years of experience coding for a living and for fun. I have extensive analytical skills and a strong foundation in computer science and software development, including object-oriented design, functional programming, data structures, operating system internals, and algorithm design and complexity analysis.

I am a team player with a strong leadership and business-value oriented mindset, focusing on technical excellence and managing technical debt. I make data- or experience-based decisions between short- and long-term trade-offs, and I actively listen to diverse perspectives to advocate for product ownership and user outcomes.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Intermediate

Language

Polish

Fluent

English

Advanced

Work Experience

Senior Software Engineer / Team Lead at Tellent

July 1, 2025 - September 24, 2025

Led a team of 4 developers delivering backend features for Core HR to scale for medium/large customers; designed API and data queries with advanced grouping and filtering; implemented tests; migrated data structures; led integration with a major German payroll system; provided daily data insights to multiple teams; worked with AWS, PostgreSQL, Docker, TypeScript, GraphQL.

Senior Data Engineer at Smartpatient

June 1, 2022 - September 24, 2025

Designed and built a company-wide secure Data Lake in AWS; created TB-scale ingestion/transformation pipelines (Step Functions, ECS, ECR, Glue); modeled medicine data in Elasticsearch; implemented data quality monitoring and a metadata engine (Amundsen); improved Data Science delivery and reduced infra costs; AWS Data Lab credential approved.

Senior Software Engineer at RTB House

April 1, 2020 - September 24, 2025

Implemented new features and maintained backend/frontend of internal applications; designed and maintained ETLs processing PB-scale data for reporting, accounting, monitoring and sales; introduced static code analysis and feature modularization.

Senior Software Engineer at ContractRoom

May 1, 2018 - September 24, 2025

Developed a digital contract negotiation platform with real-time collaboration; led migration from jQuery to Vue.js; international remote team collaboration; worked with PostgreSQL, MongoDB, Redis, Celery, Elasticsearch, Python, Django, Vue.js, JavaScript.

Senior Software Engineer / Team Lead at Ringier Axel Springer Media

May 1, 2016 - September 24, 2025

Set up technical development path for offline processing in the Ringpublishing content management platform; planned and maintained cloud-based architecture; collaborated across teams; documented features; hired and mentored developers; introduced FP and DDD approaches; promoted Agile/Scrum practices; drove KPI improvements in code quality and test coverage.

Senior Software Engineer at Grandparade.co.uk

October 1, 2013 - September 24, 2025

Created mass data processing and visualization systems in event-driven architecture; delivered 10+ complex systems for UK betting industry leaders; implemented real-time data matching heuristics and large-scale data processing.

Senior Software Engineer at Zubi.pl

May 1, 2011 - September 24, 2025

Built a sales platform with core frontend and backend elements (basket, checkout, listings, user profiles); integrated with third-party invoicing and stock control software; documented the application.

Software Engineer (Freelance) at Freelancing

April 1, 2010 - September 24, 2025

Designed and built web applications for various clients; handled graphic design, testing, and maintenance; worked with PostgreSQL, MySQL, Python, PHP, and JavaScript.

Software Engineer at Onet.pl

December 1, 2008 - September 24, 2025

Developed frontend and backend services of the popular Polish web portal in Mobile & New Tech Dept.; worked with MySQL, PHP and JavaScript.

Software Engineer (Freelance) at Freelancing

February 1, 2008 - September 24, 2025

Launched 30+ classified portals based on own solution for various clients; handled end-to-end development, design, deployment, testing and maintenance; client acquisition and advertising.