Hello, I’m Sebastian Molenda Software Engineer Backend Developer

I’m a Backend Developer and Software Engineer Based in Poznań/Poland.

I am a seasoned software engineer with over 15 years of experience, mainly in e-commerce solutions built with PHP. In recent years, I have transitioned to developing SDKs in both Python and PHP, leveraging my deep expertise to create versatile tools for developers and businesses. I'm no stranger to legacy and monolithic codebases. I understand how to work with them, improve them, and gradually modernize them. I focus on improving the developer experience through clear documentation, meaningful tests, and thoughtful API design. My diverse background highlights my adaptability and commitment to staying at the forefront of technology.

My Skills
My Career

Where I've worked?

PubNub
08.2021 - 07.2025
PubNub

I develop and maintain open-source SDKs in Python and PHP, focusing on modernization, feature development, and developer experience improvements.

DietLabs
04.2020 - 05.2021
DietLabs

Maintained and extended backend systems for diet and training platforms, with a focus on GraphQL APIs and performance optimization.

CurrencyOne
03.2018 - 04.2020
CurrencyOne

Contributed to microservice-based backend powering online currency exchange platforms, including integrations and operations support.

Komputronik
06.2013 - 03.2018
Komputronik

Worked as part of the architecture team for one of Poland's largest e-commerce platforms, owning backend features and performance.

Symetria
06.2010 - 05.2013
Symetria

Backend and frontend development for fitness and diet portals including Vitalia and Trener.pl.

Infoserwis
07.2006 - 06.2010
Infoserwis

Built and maintained e-commerce solutions for small businesses, with focus on integrations and automation.

Education

Education

2005 - 2010
Bachelor of Engineering @ Collegium Da Vinci

I majored in designing IT systems.

2003 - 2005
IT Specialist @ CKZiU

Designing and managing IT systems.

In touch!

Let's get in touch!

Contact Directly

Contact me directly!

Phone

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[email protected]

Address

Cbmanń, Cbynaq