Senior Full Stack JS Engineer

Why Join Us?

🔹 100% remote | 🌎 Global team | ⏳ Full-time

If you’re looking to work oncutting-edge AI products, solvechallenging problems, and be part of a fast-moving,high-talent team, you’ll love it here.

Join NineTwoThree AI Studio, aremote-firstproduct design, engineering, and marketing studio, founded in 2012 and based in Boston. We buildAI-powered web and mobile appsfor big brands and fast-moving startups.

You’ll work withreally smart people—the kind of teammates who challenge you, push you forward, and make you better. We movefastand focus ongetting things done.

We’ve beengrowing 20% every yearfor 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 throughfive layers of referrals. That’s how much people appreciate what we do.

We run onclear processesand strong leadership, so while we move quickly, wedon’t do chaos. We do high-quality work, and we do it right.

We focus on products with a positive impact in various domains fromsports and health, to logistics and nuclear. But if you’re into gambling, adult entertainment, or crypto, we’re not your place.

Requirements

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 dotsbetween product vision, technical feasibility, and business needs.
• Communicateoptions, trade-offs, costs, and timelines clearly to both our team and client.
• Lead projects end-to-end— from technical strategy to execution.
• Architect solutionsand apply best practices for scalable, AI-powered products.
• Guide and mentorengineers, ensuring quality while delivering fast.
• Translate business needs intotechnical decisions, explaining trade-offs and timelines.
• Solve hard problems, direct implementation, and coordinate technical challenges with clients
  

Who We’re Looking For

True seniorengineers — not just people with years of experience, but those whoownsolutions anddriveexecution.

• 5+ years of experiencein Full Stack Software Development (React, Node.js, JavaScript, TypeScript, SQL)
• Strong knowledge ofcloud platforms(AWS, Azure or GCP).
• Clear and thorough understanding ofdesign patternsand software developmentbest practices
• Great communicatorswho 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 whoensure 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 ofprinciplesof JavaScript/TypeScript languages
• Ability tofreely 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-offper year during the first 3 years, further increasing to25 daysin later years.
• Paid sick leave,10 national holidaysand2 companydays-off.
• Well-beingbudget.
• Health Insuranceallowance.
• Maternity/paternityleave.
• Accounting assistance.
• Reimbursement of expenses for professional developmentcourses/certifications(up to 100% in agreement with the Manager).
• Hardware upon business needs.
• Strong positiveengineering culture, a tightly-knit team of professionals with agood 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.

Apply nowand lead the next generation of AI-powered products.