Node.js services, REST APIs, Firebase backends, data integrations, and maintainable contracts for client applications.
I build and integrate backend services around clear contracts. That includes authentication, validation, normalized response models, third-party adapters, errors, retries, and the operational concerns a mobile or web client needs in production.
Document consumers, resources, and failure modes
Define stable request and response contracts
Implement validation, adapters, and observability
Test integrations independently from the client UI
High-throughput order books, live candles, and signed API auth.
Clinical workflows, prescriptions, labs, and unified patient records.
Operational social-care workflows on Flutter, Firebase, and offline storage.
Share your product stage, platform constraints, and integration targets. Let's engineer a resilient solution.