Marek Stefanowski

Full-Stack Software Contractor, based in the UK, open to package based contract work. 



Keebo

Keebo was a Credit-Card Startup, aimed at gamifying good usage of a credit card

  • Building services for points provisions using Python and AWS
  • High volume transaction flow
  • Verification of Account balances and statements correctness
  • CI/CD pipelines for high-reliability software release
  • Mobile App development in Typescript with React Native

Goldman Sachs

  Working with a global team in the Alternatives markets.

  • Requirements capture and liaising with key stakeholders  
  • System Architecture Design
  • Java Spring Boot applications for high-volume document processing
  • Apache Kafka queues for asynchronous processing

Starling Bank

 Payments Processing Team, high-volume card transaction processing

  • System Design of high-reliability card transaction data
  • Fraud detection on all transactions
  • Java Threaded application
  • Google Protobuf for message sending between threads

Lilium

Electric Vertical Take-off and Landing Aircraft Software 

  • Component Design of High reliability software
  • Test implementation and collection of timing and coverage data
  • Matlab, C and bespoke Integration software

Rolls-Royce Controls Systems

Design and Integration of aircraft engine control systems

  • Component Design of High reliability software
  • Test implementation and collection of timing and coverage data
  • Matlab, C and bespoke Integration software