Oskar Pietka
Senior Full-Stack Developer with 5 years of professional experience building, scaling, and maintaining high-performance web applications, APIs, and customer-facing platforms. Strong expertise in Python, Type Script, Java Script, React, Next. js, Node. js, Express, Postgre SQL, and Mongo DB, with hands-on experience across frontend and backend development, API performance, testing, cloud-based applications, and production systems.
Proven ability to deliver software at scale, including APIs processing 5M+ requests per day with p95 response times below 1 second, contributions to an internal backend framework supporting a 10-developer engineering team, and web and cloud solutions supporting clients generating $40M in combined revenue.
Experience
Senior Full-Stack Developer
Deel
San Francisco, California
- Developed and maintained Node. js and Express APIs processing 5M+ requests per day, consistently achieving p95 response times below 1 second.
- Made significant contributions to the company's internal backend framework, collaborating with a 10-developer engineering team to improve shared backend capabilities and development workflows.
- Designed and delivered customer-facing web applications across the frontend and backend, contributing to a 40% improvement in customer satisfaction.
- Built scalable frontend functionality using React, Type Script, and Next. js, with a focus on performance, usability, and maintainability.
- Developed and integrated HTML/CSS solutions within CMS platforms, supporting multiple client-facing websites and digital properties.
- Implemented Node. js-based tracking solutions to improve visibility into website usage and customer activity.
- Built and maintained web and cloud-based applications supporting client businesses generating $40M in combined revenue.
- Led and supported cross-platform testing across four major web browsers and three standalone applications, improving consistency and reliability across environments.
- Diagnosed and resolved production issues across the full stack, improving application reliability, performance, and operational stability.
- Collaborated with developers and stakeholders throughout the software development lifecycle to translate requirements into production-ready solutions.
- Contributed to technical discussions and decisions involving application architecture, backend design, performance, maintainability, and engineering practices.
Full-Stack Developer
Aura
Boston, Massachusetts
- Designed and implemented backend services and APIs supporting core application functionality.
- Built responsive frontend interfaces with a focus on performance, usability, maintainability, and cross-browser compatibility.
- Designed and worked with both relational and NoSQL databases, including Postgre SQL and Mongo DB.
- Investigated and resolved frontend and backend issues, implementing fixes that improved application stability and reliability.
- Participated in testing, deployment, maintenance, and continuous improvement across the software development lifecycle.
- Collaborated with engineering teams to design and implement scalable, maintainable software solutions aligned with business requirements.
- Contributed to code quality through debugging, testing, peer review, and technical collaboration.
Education
Wroclaw University of Science and Technology
B.S
Skills
PythonTypeScriptJavaScriptSQLHTMLCSSReactNext.jsResponsive Web DevelopmentCross-Browser CompatibilityNode.jsExpressREST APIsPostgreMongoDBAPI DevelopmentCMS IntegrationCloud ApplicationsCross-Browser TestingDebuggingBackend Framework Development
Selected Technical Achievements
5M+ API Requests Per Day
Developed and maintained Node. js/Express APIs processing 5M+ daily requests while maintaining p95 response times below 1 second.
40% Customer Satisfaction Improvement
Delivered customer-facing application improvements that contributed to a 40% increase in customer satisfaction through improvements to usability, performance, and functionality.
$40M Client Revenue Supported
Built and maintained web and cloud-based solutions supporting client businesses generating $40M in combined revenue.
10-Developer Engineering Team
Contributed extensively to a shared internal backend framework alongside a 10-developer engineering team, improving reusable backend capabilities and maintainability.
Cross-Platform Quality
Led and supported testing across four major web browsers and three standalone applications, helping ensure consistent functionality and reliability across environments.