Senior Full Stack JS Engineer

Why Join Us?

100% remote | Global team | Full-time

If you're looking to work on

cutting-edge AI products , solve

challenging problems , and be part of a fast-moving,

high-talent team , you'll love it here.

Join NineTwoThree AI Studio, a

remote-first

product design, engineering, and marketing studio, founded in 2012 and based in Boston. We build

AI-powered web and mobile apps

for big brands and fast-moving startups.

You’ll work with

really smart people —the kind of teammates who challenge you, push you forward, and make you better. We move

fast

and focus on

getting things done .

We’ve been

growing 20% every year

for the last 5 years, which means there’s plenty of room for career growth and promotions. Our work speaks for itself—some of our customers found us through

five layers of referrals . That’s how much people appreciate what we do.

We run on

clear processes

and strong leadership, so while we move quickly, we

don’t do chaos . We do high-quality work, and we do it right.

We focus on products with a positive impact in various domains from

sports and health, to logistics and nuclear . But if you’re into gambling, adult entertainment, or crypto, we’re not your place.

What You'll Do

Lead, not just code

— Seniors at NineTwoThree don’t just write great code—they lead projects, guide teams, and ensure execution quality:

Connect the dots between product vision, technical feasibility, and business needs

Communicate options, trade-offs, costs, and timelines clearly to both our team and client

Lead projects end-to-end — from technical strategy to execution

Architect solutions and apply best practices for scalable, AI-powered products

Guide and mentor engineers, ensuring quality while delivering fast

Translate business needs into technical decisions, explaining trade-offs and timelines

Solve hard problems, direct implementation, and coordinate technical challenges with clients

Who We're Looking For

5+ years of experience in Full Stack Software Development (React, Node.js, JavaScript, TypeScript, SQL)

Strong knowledge of cloud platforms (AWS, Azure or GCP)

Clear and thorough understanding of design patterns and software development best practices

Great communicators who can explain options, trade-offs, and technical details to clients and teams

Ability to break down complex problems into manageable tasks;

Passion maintaining code style and standards and holding people accountable;

Hands-on experience with microservices architecture;

Experience with React.js, Node.js, JavaScript and Typescript (at least 5 years);

RESTful API design and implementation;

OAuth and single sign-on (SAML);

Leaders who ensure execution quality, push teams forward, and keep projects on track

Strong communication and analytical skills

Relational and no-SQL databases — MySQL, PostgreSQL, Redis etc;

Solid understanding of principles of JavaScript/TypeScript languages

Ability to freely express/present/discuss ideas in English (B2-C1 level)

Flexibility with working hours to participate in meetings with Eastern USA

Not for you

If you're looking for a pure coding role where someone else makes the decisions, this isn't it.

Benefits

What We Offer

Annual paid vacation: 20 days-off per year during the first 3 years, further increasing to 25 days in later years

Paid sick leave, 10 national holidays and 2 company days-off

Well-being budget

Health Insurance allowance

Maternity/paternity leave

Accounting assistance

Reimbursement of expenses for professional development courses/certifications (up to 100% in agreement with the Manager)

Hardware upon business needs

Strong positive engineering culture, a tightly-knit team of professionals with a good sense of humor

What's The Process

We make the process fast and responsive. Short HR interview, Technical Q&A, Hands-on Practical Session (no bubble sorts), CTO interview (sometimes), Offer.

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