Full Stack Engineer/ AI Product Integration

About Lumin
Every business runs on agreements - with customers, suppliers,employees, partners.
Most of them live as files in folders and inboxes: drafted inWord, emailed around, signed somewhere else, filed away, and forgotten until something goes wrong - an auto-renewal nobody caught, a deadline nobody tracked, a clause nobody remembers. Lumin is the platform where agreements are created, signed, and managed in one place. Hundreds of millions of documents live on it, and our users trust us with the paperwork their businesses run on.
Here is what excites us: a platform that merely stores documents is a filing cabinet. A platform that understands them changes how people work. When the platform knows what an agreement says - who signed it, what it's worth, when it expires, who can cancel it - it can start doing the work itself: find the right document from a question in plain words, warn you before a deadline passes, draft the next version of an agreement, even edit documents on your behalf while you focus on something else.
That understanding is an AI problem, and it is why we are hiring.
You'd join a small AI team inside a product company - your work ships to real production users within months, not years. The team is young, so the conventions you set are the ones everyone after you builds on.
About the role A working AI demo is built in a lab. A working AI feature reaches millions of users, and getting from one to the other - scale, interaction design, stability in production - is what this role does. You'll join the AI team and own the product side of our AI: the experiences users see (TypeScript, React, Node) and the plumbing behind them.
Where other teams are involved - messaging platforms, processing infrastructure - you'll work with them: you're the link between what the AI can do and what the product needs. This is a mid-level generalist role: much of what you ship, you drive without owning every part.
What your first six months look like
Build the user-facing side of document data: show users what our AI extracted from their documents and let them check it - earning user trust through good interaction
Build the first agent experiences users see: mention the agent and it edits the document; the UI that shows what an agent is doing, what it changed, and lets users undo it
Build what runs behind these features - processing capacity, streaming updates - together with the platform teams who own those systems
What you'll do
Front end: build AI experiences in React/[protected info] with our design system -streaming responses, progress states, diff views, mobile-friendly by default
Back end: add GraphQL endpoints to our NestJS backend that wire AI services into product workflows - for example, an agreement about to expire triggers its own renewal reminder
Work across teams: connections to Slack and email, document-processing infrastructure - you coordinate, unblock, and ship
Own adoption metrics and end-to-end tests for everything you ship
Translate between AI engineers and product teams - you'll be the person who knows both sides
What you'll need
3+ years of full-stack TypeScript: React/[protected info] and [protected info] backends (NestJS or similar); GraphQL; consuming REST/gRPC services
Features you shipped end-to-end to real users - including the unglamorous parts: instrumentation, tests, rollout
Async/streaming UX patterns and state management for long-running tasks
Comfortable working in English, spoken and written
Self-directed; comfortable being the only full-stack engineer in an AI-heavy team
Nice to have
AI product UX (chat, streaming, agent interfaces)
Observability and instrumentation experience
Mobile experience (responsive web or React Native)
Why You'll Love Working Here?
Being a member at
Designveloper
, you will experience a youthful, flexible and creative work environment.
Working time 35 hours/week (Monday - Friday)
Have 2 remote days / week.
Social insurance follows law and company policies.
PVI premium health care (at least VND 100,000,000).
Professional training process. (support udemy training course).
Annual OKRs review.
Almost all customers from the US, UK ....
Support IMac/Macbook
PVI Health Care.
Refund leave days.
13th month salary and Bonus based on performance.
12-day annual leave per year.
Food & drink in the office ....
Company trips, team building, pingpong club, office party, ....