Sean Neilan
Team Lead at GrantPuma
Los Angeles, California, United States
Summary
👤
Senior🎓
Top SchoolSean Neilan is a technical leader and full‑stack engineer with 14 years of experience building high‑performance, production‑critical systems across fintech, betting, legal data, and food safety. Currently a Team Lead in Los Angeles, he has architected Kafka-based streaming pipelines, KYC-compliant digital banking microservices, and resilient mass-storage solutions for live money betting. Sean blends hands-on coding with mentorship—regularly reviewing PRs, teaching developers to navigate legacy systems, and improving team cadence through cleaner code and accurate estimates. He has a track record of squeezing orders-of-magnitude performance gains (500x query speedups, search latency cuts to 500ms) and designing systems that must work correctly on first run, such as market‑making and settlement pipelines. As a founder-CTO he scaled a profitable services business while still shipping software, and earlier research work produced distributed scrapers and published tooling for NLP annotation. Practical, security-aware, and data-driven, he thrives on turning ambiguous requirements into auditable, production-ready systems.
14 years of coding experience
13 years of employment as a software developer
BS Computer Science, BS Computer Science at DePaul UniversityHighland Park High School
Stackoverflow
1,395reputation
70kreached
3answers
8questions
mysql
top-5%
authentication
top-1%
passwords
top-5%
database
top-5%
Github Skills (110)
authentication10
database9
parser9
passwords9
mysql9
svg-path9
graph9
ofx8
node-canvas8
javascript8
svg8
bank8
canvas8
trading7
charts7
Programming languages (8)
Github contributions (5)
sneilan/alpaca-historical-data-downloader
Oct 2022 - Mar 2023
Command line tool to download / sync all alpaca historical data
Contributions:70 commits, 2 PRs, 64 pushes in 4 months
sneilan/stock-exchange
Apr 2023 - May 2024
Personal stock exchange on your laptop!
Contributions:11 PRs, 188 pushes, 12 branches in 1 year
backtestinglow-level-programmingstock-exchangestock-markettrading
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