Witold Oszkiel

Software Engineer (Full Stack)

Summary

Full-stack developer with 7+ years of experience building Python backends and React/Vue frontends — from GIS and spatial data to microservices on GCP and large-scale data systems at NatWest. Comfortable owning features end-to-end, mentoring teammates, and modernizing legacy stacks.

Experience

Confidential (NDA)

03/2026 - Present

Software Engineer

Contract engagement for an international client. Client and project details are not disclosed.

  • Python/Django upgrade and modernization for enterprise platform

NatWest Group

04/2022 - 10/2025

Software Engineer

Software engineer at NatWest Group, one of the biggest UK banks.

  • Developing system to compute large volumes of data (Python engine, FastAPI, React)
  • Migrating legacy frameworks to React and FastAPI
  • Optimizing engine calculation time and memory usage
  • Onboarding and mentoring new team members

Virtualo (Empik Group)

04/2021 - 04/2022

Python Developer

Working for Poland's largest digital content (audiobooks and ebooks) distributor.

  • Developing microservices in Python (Flask) on GCP (Storage, Datastore, App Engine, Run, Tasks)
  • Maintaining backend for high-traffic apps (e.g. Empik Go, one of Poland's largest streaming services)
  • Migrating legacy Python 2 apps to Python 3
  • Optimizing cloud costs

Grupa ZPR

01/2020 - 03/2021

Full Stack Developer

Working for one of Poland's largest media houses.

  • Developing microservices in Python (Flask, Django)
  • Developing SPA apps in Vue.js

Python Developer

Working in web development projects with Python/Django/Flask, React stack.

GIAP

01/2019 - 04/2019

Software Tester

Working in web projects (Python/Django, React), prototyping solutions — functional and visual, software verification — manual and automated testing, scripting (Python), creating websites for external and internal needs.

GIAP

02/2018 - 01/2019

Assistant IT Project Manager / GIS Expert

Implementations and training on IT projects, managing databases — data import/export.

Education

Warsaw University of Life Sciences

01/2014 - 01/2017

BSc Urban Planning (GIS)

Reaktor PWN

01/2018 - 01/2019

Bootcamp Python Backend Developer

  • Technologies: HTML, CSS, JS, Python, Django, Selenium, REST API, MySQL