Senior Full-Stack Engineer

ClosedLab Computer Science & Engineering LLC; United States; Remote; USD 120,000 - 160,000; Full time

Job summary

ClosedLab Computer Science & Engineering LLC is seeking a remote senior engineer to design and build features across PostgreSQL, TypeScript services, and React/Next.js interfaces. You will write technical plans, review code, and integrate third-party APIs while owning quality with tests and monitoring.

You will collaborate with clients to understand workflows, mentor engineers, and improve team practices, bringing 5+ years of production web app experience.

Qualifications

• 5+ years building production web applications
• Strong TypeScript, React, and SQL
• Experience designing APIs and data models
• Comfort owning work from requirements to production

Responsibilities

• Own features end to end across database, services, and interface for client platforms and ClosedLab products
• Write clear technical plans and review teammates' code
• Integrate third-party APIs such as payments, telephony, and CRMs
• Own quality with automated tests, monitoring, and careful releases
• Work directly with clients to understand workflows and constraints
• Mentor engineers and improve team practices

Skills

TypeScript

React

SQL

APIs design

Data modeling

Production web apps

Tools

PostgreSQL

Next.js

Supabase

Vercel

Node.js

Playwright

GitHub Actions

Job description

Own features end to end across database, services, and interface for client platforms and ClosedLab products.

Engineering Remote (US) Full-time [Salary or rate range]

Design and build features across PostgreSQL, TypeScript services, and React/Next.js interfaces

Write clear technical plans and review teammates' code

Integrate third-party APIs such as payments, telephony, and CRMs

Own quality with automated tests, monitoring, and careful releases

Work directly with clients to understand workflows and constraints

Mentor engineers and improve team practices

What you bring

5+ years building production web applications

Strong TypeScript, React, and SQL

Experience designing APIs and data models

Comfort owning work from requirements to production

Nice to have

Next.js, Supabase, or Vercel experience

AI or automation projects

What you will work with.

OUR STACK

TypeScript React Next.js Node.js PostgreSQL Supabase Vercel GitHub Actions Playwright

ClosedLab is an equal opportunity employer.