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Senior engineer who builds and breaks systems - full-stack delivery, offensive security, data/AI pipelines. First Class Honours in Computer Science; 8+ roles across security consultancy, VR, pharma and web.

filter:[FULL]7[SEC]2[DATA]1[HW]1
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Software Engineer · Firesand LTD

2023-12 → now

Full-stack + data engineering at a security consultancy - AWS cloud, C#/.NET, React, Glue/Spark ETL, real-time fraud-detection ML.

[FULL][SEC][DATA]london, uk[+] expand
  • Developing and managing projects across AWS cloud infrastructure, C#/.NET backends and React/Redux/Node/Vite front-ends.
  • Implemented AI/ML model integration pipelines in Python for structured and unstructured data, including real-time fraud-detection algorithms and pattern recognition.
  • Developed and optimized AWS Glue ETL jobs for large-scale data transformations, with custom validation logic and error handling for robust pipelines.
  • Advanced data partitioning and processing with Parquet to optimize big-data workflows; data sharding and large datasets in Parquet and NoSQL.
  • Designed and implemented a VPN-tunnel blackbox using WireGuard on Alpine Linux - a lightweight, portable solution for secure remote access and encrypted transmission.
  • Designed scalable architectures with cross-functional teams, focused on performance, security and scalability.
  • Containerized deployments with Docker for portability; testing and version control for code quality.
  • Troubleshot, debugged and optimized existing systems to cut technical debt.

IT Support / Web Developer / VR Developer · Vreality LTD

2017-12 → 2023-12

Web, IT and VR delivery for pharmaceutical, retail and food clients - sites built from scratch: forcoat.com, codepharm.com, solarpharma.pl.

[FULL][HW]london, uk[+] expand
  • Designed and developed web pages from scratch with modern front-end and full-stack technologies.
  • Server setup and maintenance; resolved IT and security issues for reliable web services.
  • Brand building and visual identity through software and VR development projects.

IT Specialist / Web Developer · GlaxoSmithKline

2016-10 → 2017-12

3rd-line support and development for GSK health portals on Adobe AEM across Latin America.

[FULL]poznan, poland[+] expand
  • Delivered 3rd-line support for GSK health portals on Adobe AEM, focused on the Latin America region (Mexico, Brazil, Colombia, Venezuela).
  • Upgraded existing portals to the latest Adobe AEM versions.
  • Managed all web content to company standards; implemented new projects with the development team.
  • Maintained the Remedy ticketing portal and assigned tasks for efficient support.

IT Specialist / Web Developer · Zito Sp. j.

2015-06 → 2016-10

Ran the company's Linux systems and networks - VPN and internal network config, security hardening, staff security training.

[FULL][SEC]poznan, poland[+] expand
  • Managed company computer and server systems (Linux); configured VPN and internal networks.
  • Implemented security measures and trained employees.
  • Developed a data-exchange system on a private cloud.
  • Designed webpages and online assets; daily IT support.

IT Specialist / Web Developer · KSE Marketing

2013-05 → 2015-06

Co-owned a web agency - client sites, brand identity, CRM and e-commerce systems, Google services.

[FULL]poznan, poland[+] expand
  • Managed projects and co-owned the company while freelancing as a web developer.
  • Executed web projects covering company identification, online visibility and social media presence.
  • Set up Google services; managed CRM and e-commerce systems.

Project Manager / Co-owner · Karmelkowo Candy Manufacture

2013-05 → 2015-12

Co-owned and ran a candy manufacture - planning, budgeting, people, marketing and sales.

[FULL]poznan, poland[+] expand
  • Oversaw planning, budgeting and company management.
  • Directed people, processes, marketing and sales.

PHP / Web Developer · Leo Burnett Warsaw

2012-10 → 2013-05

PHP and web development at the Leo Burnett Warsaw agency.

[FULL]poznan, poland

7 roles · 2012 → now

ksegit@kse:~/cv$ cat skills --group-by pillar

[FULL] full-stack
[SEC] security
[DATA] data / AI
[HW] hardware

ksegit@kse:~/cv$ cat education certificates languages

education
  • Middlesex University2019-2022

    Computer Science · First Class Honours

    thesis: Applications of Virtual Reality Technology in modern Mental Health Issues Treatment (VR Exposure Therapy)

  • Polish-Japanese Academy of Information Technology2010-2013

    Project Management and Information Technology

certificates
  • common software vulnerabilities
  • designing secure software
  • developing secure code
  • introduction to secure software engineering
  • testing for security
  • project management · kompetea warsaw
languages
  • polish · native
  • english · fluent · C2
  • french · basic