Senior Full Stack Engineer, JavaScript

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September 2

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NineTwoThree Studio

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Artificial Intelligence • SaaS • B2B

NineTwoThree Studio is an award-winning software design, engineering, and marketing studio headquartered in Boston, MA. The company specializes in building AI, web, and mobile applications for established brands and funded startups. With a focus on agile methodology, design thinking, and impeccable engineering, NineTwoThree Studio provides custom software development, generative AI, machine learning, and go-to-market strategies. They are known for their innovative solutions that help brands scale and iterate, supported by a team of 70 experts. The studio has successfully built 75 products and 14 startups, earning recognition as the #1 Boston Agency for four years in a row. They work across multiple industries, offering services in design sprints, product strategy, and mobile app development.

51 - 200 employees

Founded 2012

🤖 Artificial Intelligence

☁️ SaaS

🤝 B2B

📋 Description

• 100% remote | Global team | Full-time • Stable, long-term project in continuous development for 5+ years • Mature financial services platform for an insurance and financial services company • Platform handles insurance products, loan management, investment and annuity products, digital client services, real-time transactions, and AI document processing • Production system processing real transactions with regulatory compliance requirements • Polyglot architecture (Node.js + Python/Django) across microservices • Maintain and enhance banking/lending features, payment processing, and compliance workflows • Implement complex business logic for insurance, loan origination, and investment services • Build real-time data processing systems using WebSockets and event-driven patterns • Integrate with third-party services (DocuSign, payment gateways, banking APIs) • Full-stack development from REST APIs to React frontends • Ensure transaction integrity and regulatory compliance • Collaborate with a stable team with deep domain knowledge

🎯 Requirements

• 5+ years Full Stack development with both Node.js/TypeScript AND Python/Django • Strong React.js, Redux, and modern frontend development • PostgreSQL expertise including complex queries, transactions, migrations • Experience with both Knex/Objection.js (Node) and Django ORM • Microservices architecture experience • Real-time systems (WebSockets, Socket.io, Celery) • AWS and Docker experience • RESTful API design with JWT/OAuth authentication • Testing frameworks (Jest for Node.js, pytest for Python) • Financial or insurance systems experience is a plus • Strong English communication (B2-C1) • Overlap with Eastern USA timezone for meetings • Tech stack: Node.js/TypeScript (Koa.js, Objection.js, Knex.js) • Tech stack: Python (Django 4.2+, Django REST Framework, Celery) • PostgreSQL, Redis • Frontend: React, Redux, Material-UI, TypeScript, Vite, Formik, Yup • Infrastructure: AWS (S3, EC2, RDS), Docker, PM2, Gunicorn • Integrations: Socket.io, WebSockets, DocuSign, Payment APIs • Testing/Docs: Jest, Supertest, pytest, Swagger/OpenAPI

🏖️ Benefits

• Long-term stable position on established project • 20 days PTO (25 after 3 years) • 10 sick days, national holidays, 2 company days • Well-being budget • Maternity/paternity leave • Professional development reimbursement • Hardware as needed • Stable, professional team environment • Quick and efficient hiring process: HR screening → Technical discussion → Practical coding session → Offer