Javascript Backend Developer Jobs in Piscataway, NJ

Job Summary:
Thrive Mobile is seeking a Senior Backend / Infrastructure Engineer to take ownership of the systems that enhance their member experience. This role involves designing resilient APIs, managing production infrastructure on AWS, and collaborating with cross-functional teams to translate company goals into reliable systems.
Responsibilities:
• Contribute hands-on across our backend and infrastructure while establishing long-term engineering foundations.
• Own development across our core backend technologies:
• JavaScript/TypeScript services deployed on AWS (Lambda, ECS/Fargate, API Gateway)
• Supabase, Postgres, and Snowflake for storage, APIs, and analytics workflows
• Integration layers with health plan partners, Auth0, Zoho CRM, Sanity CMS, and wireless provisioning systems
• Harden operational workflows currently running on low-code tools (n8n, SQL scripts) into production services with proper observability, tests, and rollback paths.
• Drive architecture for the systems behind our three strategic pillars: Data-Driven Personalization at Scale, "Do It for Me" AI Enablement, and the Unified Member Hub.
• Lead end-to-end integrations across our vendor surface, including migrations when we outgrow a dependency.
• Author architecture decision records and runbooks as you go — we believe institutional knowledge belongs in the repo, not in people's heads.
• Partner with product, design, and operations to turn goals into actionable roadmaps.
• Work alongside compliance and member experience to ensure we deliver secure, dependable service to members managing real health conditions on Medicaid and Medicare.
• Drive architectural decisions that balance innovation with a simple, maintainable, startup-friendly stack.
• Set the bar for API design, testing discipline, observability, and on-call practices as the team grows.
• Improve reliability, security, and developer workflows across our systems.
• Identify opportunities to streamline processes and ship features faster without compromising reliability.
Qualifications:
Required:
• 5–8+ years building and owning production backend systems through design, launch, and the phase where the bill for early decisions comes due.
• Strong API design fundamentals — REST and event-driven. You have opinions about versioning, idempotency, error shapes, pagination, and backward compatibility, and you can defend them without reaching for a framework's docs.
• Proficiency with JavaScript/TypeScript, Python or Kotlin backend services
• AWS infrastructure and cloud services (Lambda, ECS/Fargate, API Gateway, CloudWatch, Secrets Manager, IAM)
• Postgres and Supabase for backend data storage and APIs
• Snowflake or similar cloud data warehousing platforms
• Integration experience — you've built against underdocumented vendor APIs, handled webhook retries in production, and know that 'the docs say it returns JSON' is not a guarantee.
• Observability as a default, not a phase-two — structured logging, distributed tracing, and alerts that page humans only when humans should be paged.
• Strong understanding of data modeling and data engineering concepts — you know when to normalize, when to denormalize, and why 'just add a JSONB column' is sometimes right and often wrong.
• Ownership-first mindset — you treat the systems you build as yours. You see it, you own it, you ship it.
• Ability to balance speed and long-term architectural thinking — ship behind flags, plan the rollback, and don't stall deploys out of fear.
• Radical transparency and no hoarding — decisions, trade-offs, and 'I tried this and it didn't work' notes all belong in the repo.
• Data-driven problem solver with strong reasoning and clarity in decision-making.
• Excellent communicator with both technical and non-technical teammates.
• Scrappy, resourceful, and motivated to build quickly.
• Curious, humble, and eager to learn.
• Passionate about serving underserved communities and improving healthcare access through technology.
• Member first, always — every technical decision gets filtered through the question: does this make a member's next interaction with us easier or harder?
Preferred:
• NestJS specifically (our current backend framework)
• Terraform or similar IaC
• Sanity CMS
• Auth0
• healthcare or regulated-data environments (HIPAA, SOC 2)
• experience deploying AI agents or LLM-powered workflows
Company:
Thrive Mobile is the world's first healthcare-focused mobile company. Founded in 2022, the company is headquartered in Nashville, USA, with a team of 11-50 employees. The company is currently Early Stage.