Systems in production.
Payments, agritech, marketplaces, video games, advertising, property: the domains change, the architecture questions rarely do. Clients who agreed to be named are named; for the others, only the context is given.
Payment aggregation platform
One integration to accept payments through more than 150 providers, with a fraud detection engine. In production.
native-request
A Node.js HTTP request module with no external dependency, maintained for several years. Around 2.6 million downloads a month.
Search API for a marketplace
Several million listings served from memory, without touching the database. Back office and performance.
Virtual item trading platform
Four payment providers, inventory, real time, and a fairness system every user can verify themselves.
Data model rebuild of an agricultural SaaS
Rebuilding the core domain of a product already in production, and migrating it without downtime.
GPS position processing engine
Taking over and rewriting a processing engine, with regression tests against the existing behaviour.
Ad network for game servers
An ad network that pays game server owners for displaying ads, with a plugin built to order for each server.
Property management platform
A platform connecting managers, tenants and contractors around building maintenance work. Back end rebuilt from scratch, single-handedly at first.
ZeQuestion
A real-time multiplayer quiz, designed, built and run end to end.
A project along the same lines (or not)?
Describe the context in a few lines. Reply within two working days.