David Stotijn
Senior Software Engineer at Hetty Software
Amsterdam, North Holland, Netherlands
Summary
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Rockstar🎓
Top SchoolDavid Stotijn is a senior software engineer based in Amsterdam with 14 years of experience building cloud-native, full-stack systems on AWS and GCP. He specializes in pragmatic Go and TypeScript development, having designed and operated the Go backend for a no-code Flow Builder used by over 1M monthly B2C customers. Comfortable across frontend frameworks like React, Svelte and AngularJS, he pairs product-focused engineering with hands-on infrastructure work—automated hosting, certificate management, queues and browser automation. As a freelancer he’s delivered backend services, RAG pipelines and SSO improvements for scale-ups, and contributed security-focused tooling (hetty) that implements proxy-based HTTP/HTTPS interception and request/response modification. He enjoys joining startups and scale-ups to solve product and engineering challenges under tight deadlines, bringing both individual contributor depth and prior engineering management experience. His blend of production-grade systems work and low-level protocol tooling shows a rare mix of pragmatic product delivery and security-minded craftsmanship.
14 years of coding experience
9 years of employment as a software developer
Propedeutics Computer science, Propedeutics Computer science at Amsterdam University of Applied SciencesComputer Science, Computer Science at University of Amsterdam
Github Skills (6)
security-testing10
go10
reverse-proxy10
ai-security10
http-proxy10
security10
Programming languages (13)
Github contributions (5)
dstotijn/hetty
Nov 2019 - May 2022
An HTTP toolkit for security research.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:11 releases, 14 reviews, 141 commits in 2 years 6 months
Contributions summary:David implemented core functionalities for an HTTP toolkit focused on security research. They developed a reverse proxy to intercept and modify HTTP traffic, including handling HTTPS requests through a man-in-the-middle approach. The user also added support for a basic HTTP tunnel, allowing the proxy to forward CONNECT requests. Furthermore, they integrated request and response modification capabilities within the proxy to inspect and manipulate traffic.
security-toolsproxysecurity-researchbugbountysecurity
dstotijn/ct-diag-server
Apr 2020 - May 2020
Diagnosis server for Apple/Google's (COVID-19) Exposure Notification framework.
Contributions:97 commits, 16 PRs, 89 pushes in 21 days
exposure-notificationnotificationsnotificationiosexposure
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