Sr. Full Stack JavaScript Engineer (Contract)

Job Description About The Role: We are seeking a skilled AI-Native Full Stack JavaScript Engineer for a placement opportunity with a fast-growing US-based startup. This is a remote role requiring full working-hour overlap with US time zones (EST/CST/PST depending on the client team). You will work directly with the startup’s engineering and product teams to build, scale, and maintain modern web and mobile applications. This is a hands-on role suited for engineers who thrive in startup environments, enjoy ownership, and can operate with high accountability and autonomy. What You'll Do: Build and maintain full-stack web and mobile applications using React.js, Next.js, Remix, React Native, and TypeScript Architect, develop, and optimize backend APIs and services using Node.js, Express.js, NestJS, Fastify, and GraphQL Design reusable, scalable React component systems Integrate third-party APIs and services (e.g., Stripe, Plaid, Mapbox, DocuSign, Stytch, etc.) Design and manage relational databases (PostgreSQL, AWS Aurora) and caching systems (Redis) Contribute to cloud-based deployments (AWS ECS/Fargate, S3, Load Balancers, etc.) Participate in CI/CD automation workflows (GitHub Actions, Vercel, AWS pipelines, Fastlane, Expo EAS) Support secure authentication and authorization flows (Auth0, Firebase, custom JWT flows) Collaborate in sprint planning, code reviews, and architectural discussions Write clean, maintainable, secure, and well-tested code Contribute to documentation and technical decision-making processes Required Qualifications: 4–6 years of professional experience in software engineering Strong expertise in JavaScript and TypeScript Deep experience with React, Next.js, Remix, and/or React Native Solid backend development experience with Node.js ecosystems Strong database knowledge (PostgreSQL, Aurora, Redis) Experience working with cloud infrastructure (AWS preferred; Azure/GCP acceptable) Familiarity with GraphQL Familiarity with Docker and containerized environments Experience integrating third-party APIs and payment providers Experience integrating AI APIs (OpenAI or similar platforms) Strong understanding of application security and performance optimization Excellent written and verbal English communication skills Ability to work fully aligned with US business hours Preferred / Nice to Have: Experience in startup environments Exposure to CI/CD optimization and DevOps practices Experience working in distributed, remote-first teams Working Requirements: 100% availability during US working hours Reliable high-speed internet connection Ability to operate independently in a fast-paced startup environment Strong sense of ownership and accountability Compensation: Hourly compensation Top market rates in USD (~$20/hour) Full-time hours expected (40 hours/week) Remote contract engagement Company Overview: Type B Digital is a forward-thinking consulting firm focused on designing and developing innovative software solutions that elevate user experiences and drive measurable business impact. Our multidisciplinary team brings together creativity, engineering excellence, and strategic insight to deliver digital products our clients love. We’re expanding our engineering team and seeking a Full Stack JavaScript Engineer who thrives on building secure, scalable, and modern AI-first web and mobile applications.