Senior Full Stack JS Engineer

NineTwoThree AI Studio; United States; Remote; USD 140,000 - 210,000; Full time

Benefits offered by this job

Paid time off

Health insurance stipend

Remote-friendly culture

Hardware on business demand

Professional development support

Job summary

NineTwoThree AI Studio, a remote-first product design, engineering, and marketing studio, is seeking a Senior Full Stack Engineer to lead projects and drive execution. You will bridge product vision with technical feasibility and business needs, guiding teams across AI-powered web and mobile apps for global brands.

You’ll mentor engineers, design scalable architectures, and collaborate with clients to deliver high-quality, timely solutions that push the boundaries of AI.

Qualifications

• 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 understanding of design patterns and software development best practices.
• Great communicators who can explain options, trade-offs, and technical details to clients and teams.
• Hands-on experience with microservices architecture.

Responsibilities

• Lead projects end-to-end—from technical strategy to execution.
• Architect solutions and apply best practices for scalable, AI-powered products.
• Mentor engineers and ensure quality while delivering fast.
• Translate business needs into technical decisions and timelines.
• Coordinate technical challenges with clients and teams.

Skills

Full stack

React

Node.js

JavaScript

TypeScript

SQL

Cloud platforms

Design patterns

Microservices

RESTful APIs

OAuth SAML

Leadership

English communication

Tools

AWS

Azure

GCP

Job description

Why Join Us?

100% remote| Global team| Full-time

Ifyou’re looking towork oncutting-edge AIproducts, solvechallenging problems, and bepart ofafast-moving,high-talent team, you’ll love ithere.

Join NineTwoThree AIStudio, aremote-firstproduct design, engineering, and marketing studio, founded in2012 and based inBoston. WebuildAI-powered web and mobile appsfor big brands and fast-moving startups.

You’ll work withreally smart people—the kindofteammates who challenge you, push you forward, and make you better. Wemovefastand focus ongetting things done.

We’ve beengrowing20% every yearfor the last 5years, which means there’s plenty ofroom for career growth and promotions. Our work speaks for itself—someofour customers foundus throughfive layers ofreferrals. That’s how much people appreciate what wedo.

Werun onclear processesand strong leadership, sowhile wemove quickly, wedon’t dochaos. Wedohigh-quality work, and wedoitright.

Wefocus onproducts with apositive impact invarious domains fromsports and health, tologistics and nuclear. But ifyou’re into gambling, adult entertainment, orcrypto, we’re not your place.

What You’ll Do

Lead, not just code— Seniors atNineTwoThree 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 toboth our team and client.
• Lead projects end-to-end— from technical strategy toexecution.
• 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 ofexperience, but those whoownsolutions anddriveexecution.

• 5+years ofexperienceinFull Stack Software Development (React, Node.js, JavaScript, TypeScript, SQL)
• Strong knowledge ofcloud platforms(AWS, Azure orGCP).
• Clear and thorough understanding ofdesign patternsand software developmentbest practices
• Great communicatorswho can explain options, trade-offs, and technical details toclients and teams.
• Ability tobreak 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 (atleast 5years);
• RESTful API design and implementation;
• OAuth and single sign-on (SAML);
• Leaders whoensure execution quality, push teams forward, and keep projects ontrack.
• Strong communication and analytical skills
• Relational and no-SQL databases— MySQL, PostgreSQL, Redis etc;
• Solid understanding ofprinciplesofJavaScript/TypeScript languages
• Ability tofreely express/present/discuss ideas inEnglish (B2-C1level)
• Flexibility with working hours toparticipate inmeetings with Eastern USA.

Not for You?

Ifyou’re looking for a pure coding role where someone else makes the decisions, this isn’t it.

What We Offer

• Annual paid vacation:20days-offper year during the first 3years, further increasing to25daysinlater years.
• Paid sick leave,10national holidaysand2companydays-off.
• Well-beingbudget.
• Health Insurance allowance.
• Maternity/paternityleave.
• Accounting assistance.
• Reimbursement ofexpenses for professional developmentcourses/certifications(upto100% inagreement with the Manager).
• Hardware upon business needs.
• Strong positiveengineering culture, atightly-knit team ofprofessionals with agood sense ofhumor.

What’s The Process

Weemake the process fast and responsive. Short HRinterview, Technical Q&A, Hands-on Practical Session (nobubble sorts), CTO interview (sometimes), Offer.