Senior Backend / Integration Engineer (Node.js)

Join Akvelon — build products used by millions! Akvelon is an IT company with 20+ years of experience and 1,200+ engineers across 15+ locations worldwide. We work with both well-known global tech companies, including Microsoft, Facebook, Airbnb, Dropbox, and Pinterest, and with growing startups. Our teams are involved in different types of engineering projects, from cloud solutions and AI/ML systems to big data, web, and mobile applications. Since we are remote-first, our engineers work in distributed teams with flexible hours. We value ownership, clear communication, and the ability to take responsibility for your part of the work. About the project Our client, a US-based digital health company, is building a closed-loop wellness platform. The central engineering challenge is integration: consolidating around a dozen existing production systems (EMR, wearables, labs, billing, messaging) into a single unified experience, automating data transfers that are manual today, and picking canonical sources of truth per data type — all while handling Protected Health Information (PHI) end to end. We're looking for a Senior Backend / Integration Engineer to build the API and integration layer that powers the platform, working closely with the architect, mobile, and web teams in a distributed setup. Requirements 5+ years of backend development experience, with strong hands-on TypeScript/Node.js Proven experience designing and building API integrations with third-party systems (REST/webhooks, auth flows, rate limits, retries, data reconciliation) Strong experience with PostgreSQL — data modeling, queries, and performance Experience with cloud and serverless environments (Cloudflare Workers/Hono, or Node on AWS/GCP) Solid understanding of building reliable, testable services with automated tests Experience with background jobs, queues, and scheduling Excellent spoken and written English communication skills Ability to work independently and collaborate effectively within a remot