Simon Tretter
Co-Founder & Geschäftsführer at One100
Vienna, Austria
Summary
🤩
Rockstar🎓
Top SchoolSimon Tretter is a Vienna-based technology founder and CTO with over a decade of hands-on software engineering and leadership experience across startups and established firms. He co-founded multiple ventures including hokify and currently leads One100 while also serving as CTO at Szene1, blending product vision with day-to-day technical execution. A pragmatic backend and API specialist, Simon has contributed to notable open-source projects—improving job scheduling in Agenda, type safety in DefinitelyTyped and tsoa, and performance-related fixes in Penthouse—demonstrating attention to correctness, scaling, and TypeScript robustness. His background ranges from low-latency systems work to automation at T-Systems and internships at FX Palo Alto Labs, showing comfort in both research environments and production ops. Colleagues describe him as a systems-minded builder who surfaces non-obvious fixes (for example, preventing greedy locking by including job names) that materially improve reliability. He holds an MSc from the University of Amsterdam and a BSc from WU Vienna, combining formal training with entrepreneurial grit.
11 years of coding experience
11 years of employment as a software developer
Master of Science (MSc), Master of Science (MSc) at University of AmsterdamBachelor of Science (B.Sc.), Bachelor of Science (B.Sc.) at WU (Vienna University of Economics and Business)
German, English, Spanish, Dutch
Stackoverflow
21reputation
984reached
3answers
1question
Github Skills (43)
mongoose10
puppeteer10
javascript10
typesc10
performance-monitor10
api-design10
typescript10
type-definition10
mongodb-database10
type-system10
performance-analysis10
typescript-types10
rest-api10
nodejs10
error-handling10
Programming languages (18)
Github contributions (5)
agenda/agenda
Sep 2020 - Aug 2022
Lightweight job scheduling for Node.js
Role in this project:
Back-end Developer
Back-end DeveloperContributions:37 reviews, 219 commits, 23 PRs in 1 year 11 months
Contributions summary:Simon primarily contributed to bug fixes and improvements within the Agenda job scheduling library. Their commits focused on enhancing the library's performance, particularly concerning sharding capabilities by modifying the save-job functionality to include job names. The user also addressed locking issues by adding job names to lock calls, preventing greedy locking, and made other small adjustments to improve test cases. Additionally, there were changes related to TypeScript refactoring.
schedulerjobcronschedulerunner
lukeautry/tsoa
Nov 2019 - Aug 2022
Build OpenAPI-compliant REST APIs using TypeScript and Node
Role in this project:Back-end Developer & API Developer
Back-end Developer & API DeveloperContributions:15 reviews, 38 commits, 16 PRs in 2 years 10 months
Contributions summary:Simon primarily focused on improving the type definitions for OpenAPI-compliant REST APIs within the tsoa project. Their work involved fixing security type definitions, improving model validation, and updating the project to use newer TypeScript versions. They also contributed to path collision detection and improved the handling of dynamic routes within the API generation process. This suggests a strong focus on the API's internal structure, validation, and overall correctness.
apicompliantnodejsrestrest-api
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