Aaron Elligsen
Senior Full Stack Engineer at Seen
Berlin, Germany
Summary
👤
Senior🎓
Top SchoolAaron Elligsen is a Senior Full Stack Engineer with 11 years of experience building distributed, production-grade web systems, currently based in Berlin. He has led architecture and implementation for real-time SaaS products using Node.js and TypeScript—most notably a websockets-based Cobrowse system—and has a strong backend pedigree in Python, PHP and infrastructure-as-code on AWS. Aaron contributes to open-source tooling around TypeScript property-based testing (fast-check), adding combinators like flatMap/chain and improving maintainability. With a BS in Mathematics and Computer Science, he combines formal-methods interests (TLA+, Dafny) with pragmatic engineering, routinely improving performance and testability across ETL, payments, and streaming systems. An Italian-American with dual citizenship, he blends cross-cultural adaptability with hands-on leadership of small teams and long-lived codebases.
11 years of coding experience
19 years of employment as a software developer
BS Mathematics, BS Mathematics at University of OregonMarist High School
Github Skills (9)
property-based-testing10
typescript10
typescripts10
typescript-types10
testing10
quickcheck9
unit-test9
unit-testing9
javascript8
Programming languages (15)
Github contributions (5)
dubzzz/fast-check
May 2018 - Oct 2018
Property based testing framework for JavaScript (like QuickCheck) written in TypeScript
Role in this project:
Back-end Developer
Back-end DeveloperContributions:14 commits, 2 PRs, 14 comments in 4 months
Contributions summary:Aaron primarily focused on refactoring and enhancing the `fast-check` library's codebase. They renamed functions and removed unnecessary type annotations to improve code clarity and maintainability. They introduced new functionality like the `flatMap` and `chain` methods for arbitrary transformation, and updated tests to reflect the changes. The user's commits demonstrate expertise in TypeScript and property-based testing techniques.
javascriptproperty-based-testingquickchecktypescripttesting
hath995/vimfiles
Aug 2015 - Sep 2017
Contributions:48 commits, 1 PR, 38 pushes in 2 years 1 month
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