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BugFyx

About me

One developer you can reach

I am Patrick Willemsen, a full-stack software engineer from ’s-Hertogenbosch and the owner of BugFyx.

Patrick Willemsen, owner of BugFyx
Patrick WillemsenOwner and full-stack software engineerView my LinkedIn profile
  • 8+ years of experience
  • BSc ICT & Software Engineering, Fontys University of Applied Sciences, Eindhoven (2021)
  • Based in ’s-Hertogenbosch
  • Insured for professional liability

I have been building software that a lot depends on for 8+ years. At ING I worked on InsideBusiness, the platform multinationals and governments bank with, and helped recover the application after incidents. At ABN AMRO and de Volksbank I built applications and integrations that simply have to work, and at VodafoneZiggo I kept a system with more than 80 web shops running.

At TCS, as lead AI integration engineer, I built an app with large language models from start to finish. There I saw how fast you can build something with AI, and how much more it takes afterwards to make it secure and reliable.

That is what I do with BugFyx. Founders and companies build with AI faster than ever, and I make sure their app stays secure, stable and online. I also build custom software, such as my own SaaS Traecy.

Where I have worked

  1. ABN AMRO 2026 – now

    Java software engineer

    New applications through the whole development cycle: designing and building APIs, writing tests, deploying through CI/CD and monitoring in production.

  2. TCS 2025 – 2026

    Lead AI integration engineer and Java software engineer

    Built an app with large language models end to end, and turned an outdated system that processes more than 100,000 invoices a year into tested Java services.

  3. ING 2022 · 2024 – 2025

    Java software engineer

    Features and bug fixes for InsideBusiness, ING’s wholesale banking platform, helped recover the application after incidents, and built ESG reports for regulators.

  4. Benerail 2023 – 2024

    Lead Java software engineer and scrum master

    An API following the OSDM standard that lets travel agents worldwide book European rail travel, in a team of two.

  5. VodafoneZiggo 2021 – 2022

    Full-stack software engineer, through FrontWave

    Maintenance and new features for a CMS running more than 80 web shops, where downtime during peak traffic is not an option.

  6. de Volksbank 2020 – 2021

    Java integration specialist

    Spring Boot integrations between the bank’s COBOL systems and the software of mortgage advisers, including CI/CD and coaching a junior developer.

How I work

  • Reachable

    You email me, and depending on your plan you message or call me. No ticket system and no rotating developers.

  • Honest

    I say what I do and don’t do. Fixed prices, response times in writing and no promises I can’t keep.

  • Precise

    I look for the cause of a bug instead of the symptom, and test that the rest keeps working.

  • No jargon

    You don’t need to be a developer to understand what is going on with your app.

Company details

Company name
BugFyx B.V.
Address
Siloweg 3, 5222 BN ’s-Hertogenbosch
Chamber of Commerce (KvK) number
85781517
VAT number
NL863739842B01

Know where your app stands within 5 working days

With the App Check you get a clear report on security, database, hosting and backups for €600. If you take a maintenance plan afterwards, I credit the €600 in full.

  • Fixed price
  • Plain-language report
  • Within 5 working days