Senior Full-Stack Engineer — TS/React, Postgres & AI Editor

Essoflo; United States; Hybrid; USD 90,000 - 130,000; Full time

Job summary

Essoflo is seeking a skilled software engineer to help evolve a multi-tenant app with a Postgres migration, row-level security and a shared React-based editor.

You will own features end-to-end, from design to live operation, ensuring correctness, performance and security in production, with a focus on TypeScript, React and PostgreSQL.

Within the first ninety days you’ll ship a feature touching the database, the API and the editor, becoming the go-to person for that part of the system.

Qualifications

• Three+ years producing production React and TypeScript apps.
• Able to read query plans and reason about DB access rules.
• Document design decisions with clear notes and comments.

Responsibilities

• Ship a feature touching database, API, and editor within the first ninety days.
• Own features end-to-end from design to live operation.
• Collaborate to ensure multi-tenant safety and correctness.

Skills

TypeScript

React

PostgreSQL

Query planning

Job description

• Features from the schema to the screen — a Postgres migration, the row-level security on top of it, the service layer, and the React that renders it.
• The editor: a ReactFlow canvas, a table view, a document view and a presenter mode that all read and write the same procedure and have to stay in sync.
• The AI features: drafting a procedure from a description or an uploaded document, answering questions about one, and being clear in the UI about what the model actually did.
• Performance and correctness in a multi-tenant app, where a leak between organizations is the worst bug we could ship.

What we look for

• Several years writing production TypeScript and React, including the messy parts: state that outlives a component, data that arrives out of order, complicated forms.
• Real Postgres experience. You can read a query plan, and you know why an access rule belongs in the database rather than in a handler.
• You write things down: a design note before you build, and comments that explain why rather than restating the code.
• Comfort owning a feature all the way out, including when it is live and something is wrong.

Nice to have

• Next.js App Router and React Server Components in production.
• Supabase, or another stack where auth, storage and the database come together.
• Having built with LLMs somewhere real: streaming, structured output, and knowing when a model is the wrong tool.

Optional. Not having these would not rule anyone out.

The first ninety days

By ninety days you would have shipped a feature touching the database, the API and the editor, and be the person the team asks about that part of the system.

How we hire

• 1 A thirty-minute conversation about the role and what you are looking for.
• 2 A longer conversation about work you have done.
• 3 A short exercise or working session, scoped and agreed in advance.