David Flemström
Member Of Technical Staff at Modal
Stockholm, Sweden
Summary
🤩
Rockstar🎓
Top SchoolDavid Flemström is a seasoned systems-oriented software engineer with 16 years of experience building scalable platform services, embedded systems, and developer tooling from Stockholm. He has held senior and product-facing roles at Spotify and now works as Member of Technical Staff at Modal, blending hands-on engineering with platform strategy. David is an active open-source contributor in the Rust ecosystem—helping optimize high-performance layout engines (stretch, taffy), enabling no_std builds for embedded use, and improving wasm-bindgen and serde—showing a rare mix of low-level performance tuning and cross-platform compatibility. His background includes embedded IoT work, Docker tooling and JVM libraries, plus test automation for orchestration systems, reflecting cross-domain fluency from hardware to cloud. Notably, he focuses on robustness and maintainability—refactoring ID management, eliminating unsafe unwraps in embedded code, and adding integration tests—so systems are both fast and reliable. He studied computer software engineering at KTH and brings a pragmatic, safety-first approach to complex platform challenges.
16 years of coding experience
17 years of employment as a software developer
Computer Software Engineering, Computer Software Engineering at KTH Royal Institute of Technology
English, German, Swedish, French, Latin
Stackoverflow
26,077reputation
733kreached
234answers
28questions
haskell
top-1%
if-statement
top-1%
monads
top-5%
opengl
top-5%
functional-programming
top-5%
lazy-evaluation
top-5%
Github Skills (91)
page-layout10
testing10
curses10
maven-plugin10
text-formatting10
if-statement10
javas10
junit10
code-generation10
maven10
embedded10
haskell10
integration-testing10
javascript10
jquery10
Programming languages (16)
Github contributions (5)
dflemstr/rq
Feb 2016 - Dec 2022
Record Query - A tool for doing record analysis and transformation
Role in this project:
Back-end Developer
Back-end DeveloperContributions:21 releases, 505 commits, 114 PRs in 6 years 11 months
Contributions summary:David primarily contributed to the core functionality of the `rq` project, focusing on the implementation of parsing and evaluation for the query language. They added support for features such as space-separated arguments, and integer arguments, and also worked on basic function evaluation. This user appears to be responsible for developing the core logic of the record query tool.
avrocommand-line-toolquerytransformationprotobuf
vislyhq/stretch
Sep 2019 - Dec 2019
High performance flexbox implementation written in rust
Role in this project:Backend Developer
Backend DeveloperContributions:17 commits, 2 PRs, 7 comments in 3 months
Contributions summary:David primarily focused on low-level optimizations and platform compatibility within the `stretch` flexbox implementation written in Rust. Their contributions involved refactoring the ID management system for improved performance and enabling `no_std` compilation, indicating a focus on resource-constrained environments. They also made several code changes related to the core flexbox algorithms, including improvements in layout calculations.
flexboxrustcross-platformandroidios
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