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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

True senior engineers – not just people with years of experience, but those who own solutions and drive execution.

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

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

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

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;

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.

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.
  • 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.


Apply now and lead the next generation of AI-powered products.

What You Should Know About Senior Full Stack JS Engineer, NineTwoThree AI Studio

Are you ready to step into the role of a Senior Full Stack JS Engineer with NineTwoThree AI Studio? Embrace the opportunity to work remotely with a dynamic global team dedicated to building cutting-edge AI products. At NineTwoThree, we pride ourselves on cultivating an environment where creativity and technical proficiency thrive. You'll be at the forefront of developing AI-powered web and mobile applications for renowned brands and innovative startups. This isn't just about writing code; as a senior engineer, you'll lead projects, mentor fellow team members, and ensure that we execute solutions that not only meet our clients' needs but delight them. With over 5 years of experience in Full Stack Software Development, including expertise in React.js, Node.js, and cloud platforms like AWS or Azure, you will be proficient in translating complex business requirements into effective technical strategies. Your ability to communicate technical details clearly is essential as you work closely with clients and your team. If you're passionate about tackling challenging problems and driving quality execution, NineTwoThree is the perfect place for you. With competitive benefits, a culture that values well-being, and the promise of continuous professional growth, we invite you to join our team and help us make a positive impact across various sectors. So, if you're ready to thrive in an engaging environment, apply now, and let’s shape the future of AI together at NineTwoThree AI Studio!

Frequently Asked Questions (FAQs) for Senior Full Stack JS Engineer Role at NineTwoThree AI Studio
What are the responsibilities of a Senior Full Stack JS Engineer at NineTwoThree AI Studio?

As a Senior Full Stack JS Engineer at NineTwoThree AI Studio, your responsibilities extend beyond coding. You will lead projects, communicate with clients about technical trade-offs, and mentor junior engineers. Additionally, you’ll architect scalable solutions, solve complex technical challenges, and ensure high execution quality from project inception to completion.

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What qualifications are required for the Senior Full Stack JS Engineer position at NineTwoThree AI Studio?

To qualify for the Senior Full Stack JS Engineer role at NineTwoThree AI Studio, candidates should have 5+ years of experience in Full Stack Software Development, particularly with React.js, Node.js, and JavaScript. Proficiency in cloud platforms such as AWS, Azure, or GCP, along with a strong understanding of design patterns, is essential. Additionally, strong communication skills and experience in microservices architecture will be critical.

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What is the work culture like for Senior Full Stack JS Engineers at NineTwoThree AI Studio?

The work culture for Senior Full Stack JS Engineers at NineTwoThree AI Studio is collaborative and supportive. As part of a tightly-knit team, you will encounter challenges that encourage professional growth and development. The studio promotes a positive engineering culture that values humor and camaraderie while maintaining high standards of quality in the projects undertaken.

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What opportunities for growth are available for Senior Full Stack JS Engineers at NineTwoThree AI Studio?

NineTwoThree AI Studio offers substantial opportunities for growth to its Senior Full Stack JS Engineers. With a consistent 20% annual growth, there are many chances for promotions and professional development. You'll be encouraged to pursue certifications and courses, with reimbursement available, fostering an environment where you can enhance your skills and career trajectory.

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How does the remote work setup operate for the Senior Full Stack JS Engineer at NineTwoThree AI Studio?

The remote work setup at NineTwoThree AI Studio is designed to facilitate collaboration across a global team. While you have the flexibility to work from anywhere, you'll need to adjust your hours for meetings with the Eastern USA team. The processes in place ensure clarity and efficiency, allowing you to contribute effectively regardless of your location.

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Common Interview Questions for Senior Full Stack JS Engineer
How do you approach leading a project as a Senior Full Stack JS Engineer?

In leading a project, it's essential to understand both the product vision and the technical feasibility. I begin by assessing the project requirements and collaborating with stakeholders to outline the timeline and resources needed. Clear communication throughout the project lifecycle ensures that all team members are aligned, and I prioritize mentoring to foster a collaborative atmosphere.

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Can you describe your experience with microservices architecture?

Throughout my career, I've designed and implemented microservices architecture for various applications. This involves breaking down services into smaller, manageable components that can operate independently. I ensure effective communication between services is maintained, while best practices in RESTful API design and security protocols like OAuth are followed.

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What's your approach to mentoring junior engineers?

Mentoring junior engineers involves understanding their individual strengths and weaknesses. I focus on creating an open environment where they feel comfortable asking questions. Regular code reviews and pairing on tasks help in providing real-time feedback, which I believe is crucial for their growth. Encouraging them to take ownership of their work is also a vital aspect of my mentoring approach.

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How do you handle tight deadlines without compromising on quality?

Handling tight deadlines requires careful prioritization and efficient planning. I break tasks into smaller milestones and assess each team's capacity. Open communication with stakeholders about timelines allows for transparent negotiations about deliverables. I also encourage a culture that values quality and discussions on potential trade-offs, ensuring that the integrity of the final product remains intact.

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What strategies do you use for effective team collaboration?

Effective collaboration is rooted in clear communication and mutual respect. I leverage tools like Slack or Trello to provide platforms where team members can share ideas and track progress. Regular check-ins foster a culture of openness, and I often encourage brainstorming sessions to engage everyone in problem-solving, enhancing our collective creativity.

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How do you stay updated on the latest technologies and trends in full stack development?

I stay updated by following influential tech blogs, participating in online forums, and attending webinars or workshops. Networking with other professionals allows me to share insights and learn about emerging technologies. Additionally, I constantly explore new tools and frameworks that could enhance my work, ensuring I bring contemporary solutions to my role.

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Can you discuss your experience with cloud services like AWS or Azure?

I have extensive experience utilizing AWS for deploying applications, managing servers, and utilizing its various services such as Lambda and RDS for database solutions. On projects, I often assess the best cloud provider based on cost, scalability, and feature sets, ensuring that my choices align with the business needs and technical requirements.

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How do you ensure code quality in your projects?

Ensuring code quality begins with following best practices and design patterns during development. I advocate for thorough code reviews and utilize automated testing frameworks to catch issues early. I also emphasize the importance of maintaining documentation, which aids in clarity and understanding for future development.

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What challenges have you faced in your previous full stack projects?

In my prior projects, I've encountered challenges such as integrating legacy systems with modern applications or managing performance issues due to high user loads. Each time, I approached the challenge systematically, analyzing root causes, and collaborating with my team to develop innovative solutions that met our objectives while optimizing performance.

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Why are you interested in the Senior Full Stack JS Engineer position at NineTwoThree AI Studio?

I'm particularly drawn to NineTwoThree AI Studio because of its commitment to innovation and the impact of its projects. I admire the emphasis on mentorship and the opportunity to work with diverse teams. Aligning my skills in AI-powered applications with a company dedicated to making a positive impact excites me, and I see it as the perfect environment to further my growth.

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Full-time, remote
DATE POSTED
April 4, 2025

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