Senior JavaScript Engineer for Enterprise AI Platform

Back-End Web, Full Stack Web.

Senior

Upper-Intermediate English

Required Skills

JavaScript

5.0 yr.

React

5.0 yr.

Node.js

5.0 yr.

PostgreSQL

3.0 yr.

TypeScript

5.0 yr.

Nice to Have

Vue.js

Summary

Senior Backend Engineer, Node.js, Postgres. Remote role building core platform systems for an enterprise AI product. 5+ years experience required.

Are you a talented developer looking for a remote job that lets you show your skills and get decent compensation? Join Upstaff.com, a platform that connects you with hand-picked startups and scale-ups in the US and Europe.

About the company

Our client builds an AI platform that enables enterprises to customize and deploy AI capabilities for their specific needs. The platform team is central to this work, responsible for infrastructure, shared components, and internal tooling that the rest of engineering depends on. The team works closely with product and applied AI engineers, with short feedback loops and genuine technical ownership.

The role

This is a backend-focused engineering position working on core platform systems. You'll design and build the foundational services that AI-native products run on — dealing with architecture decisions, performance problems, data modeling, and system reliability.

The work is technically demanding. When something difficult or critical needs to be solved properly, this role is expected to lead that effort.

What you'll work on

Designing and implementing backend services and system components end-to-end
Building infrastructure that supports fast iteration without sacrificing reliability
Investigating and resolving complex issues across performance, data, and APIs
Collaborating with platform, AI, and product teams to deliver systems that are observable and maintainable
Improving developer experience through better tooling, clearer standards, and thoughtful architecture

What we're looking for

5+ years of software engineering experience with JavaScript tech stack, with clear ownership of complex backend systems
Strong Node.js proficiency- clean, well-structured backend code matters here
Solid understanding of relational databases (PostgreSQL) and data modeling
Good debugging instincts and sound engineering judgement
Ability to learn new domains quickly and work independently

Useful additions

Experience with distributed systems, caching layers, message queues, or multi-tenant architectures
Background in AI/LLM integration on the backend
Familiarity with AI development platforms or coding assistants
Previous work on enterprise platforms or AI infrastructure
Platform/infrastructure experience: observability, CI/CD, API design

Not your tech stack?

Join the Upstaff community and we are looking for the best project for you. Be ready for the next steps:

Create your profile on our website (import from LinkedIn)
20-30-minute screening call
Technical interview
Feedback
Project Selection (we are looking for the best project for you).

We work with developers from 50+ countries in different regions: Europe, LATAM, the U.S. (W-9 form owners), Canada, Asia (Philippines, Indonesia), Oceania (Australia, New Zealand, Papua New Guinea), and the the UK.

We don’t have a legal and ethical basis to accept applicants from the following countries: Russia, Belarus, Iran, North Korea
We do not provide visa assistance, and our cooperation model does not include the benefits typically offered with direct hire.