Senior Full Stack JS Engineer

NineTwoThree AI Studio; España; A distancia; EUR 70.000 - 110.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Health Insurance

Well-being budget

Hardware provided

Paid vacation 20 days

Maternity/paternity leave

Professional development support

Descripción de la vacante

NineTwoThree AI Studio is a remote-first product design, engineering, and marketing studio delivering AI-powered web and mobile apps to global brands. We seek senior engineers who lead projects, architect scalable AI solutions, and mentor teams to deliver high-quality results.

Join a fast-moving, high-talent team with strong leadership, clear processes, and opportunities for career growth across a remote, international client base.

Formación

• 5+ years in Full Stack Software Development (React, Node.js, JavaScript, TypeScript, SQL)
• Cloud platforms knowledge (AWS, Azure or GCP)
• Strong understanding of design patterns and best practices in software development
• Excellent communication with clients and teams to explain options and trade-offs
• Experience with microservices architecture and RESTful APIs
• English proficiency (B2-C1) and flexibility for meetings with Eastern USA

Responsabilidades

• Lead projects end-to-end, from technical strategy to execution
• Architect scalable, AI-powered solutions and guide engineers
• Mentor engineers and ensure quality while moving fast
• Translate business needs into technical decisions with clear trade-offs

Conocimientos

React

Node.js

JavaScript

TypeScript

SQL

NoSQL

Cloud platforms

Microservices

Design patterns

Leadership

English communication

Herramientas

RESTful APIs

OAuth

SAML

MySQL

PostgreSQL

Redis

Descripción del empleo

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.