Full-Stack Software Engineer

US Mobile is building the future of wireless communication. We are propelling consumer self‑service by integrating all three major networks on one phone and adding home internet from Starlink. This product‑centric tech company is looking for a full‑stack JavaScript engineer to contribute to our scalable, cross‑functional teams.

We’re looking for a full‑stack JS engineer to help us scale and connect millions of devices to wireless networks.

As a Full‑Stack Software Engineer, you will:

• Work on developing and deploying exciting new features
• Advise on technologies and present solutions to the team
• Take on legacy architecture and digital transformation projects
• Expand our Node services suite of applications
• Document any new and undocumented processes and workflows
• Work in a start‑up environment with lots to do and wear many hats
• Assist in building tools to ensure a high‑quality end‑user product
• Help us scale to tens of millions of customers & connected devices

What we are looking for:

• Strong full‑stack engineer comfortable owning a feature from Postgres schema through WebSocket protocol to the React component the user clicks on
• Prior experience replacing or building support / messaging / chat tooling (Intercom, Zendesk, Front, LiveChat, etc.)
• Deep Node.js + TypeScript experience – strict TS, generics, discriminated unions, you reach for the type system before tests
• Strong React – modern hooks‑era React; you’ve shipped non‑trivial SPAs and know how to keep them fast under real load. Bonus if you’ve worked with React Native (especially native module / push / deep‑link plumbing) or built embeddable / drop‑in components
• Experience with relational data modeling and SQL (Postgres preferred). You know what an index does and when it doesn’t
• Comfort with real‑time systems – WebSockets, pub/sub, presence, reconnection, backpressure. You understand why at‑least‑once delivery is a different problem from exactly‑once
• Experience with queues and async fan‑out (SQS, RabbitMQ, Kafka, Redis Streams)
• Working knowledge of AWS and containerized deployments (EKS / Kubernetes, or equivalent). You don’t need to be an SRE, but you should be able to read a Terraform plan and know what an ALB is doing
• Solid API design instincts – REST contracts, versioning, OpenAPI / typed clients, idempotency, pagination
• Care about security and compliance. You’d push back if someone proposed logging message bodies to CloudWatch
• A bias toward clean, appropriately tested code and clear written communication – specs, ADRs, PR descriptions that explain the why
• Strong communication and writing – most of our coordination is async and in‑doc
• An ability and desire to help teammates grow through mentorship and code review

Bonus Points:

• Experience with React Native beyond the JS surface – bridging modules, push tokens, background state, keyboard / safe‑area edge cases
• Experience designing or operating systems with CPNI / HIPAA / PCI / SOC 2 compliance constraints
• Experience with SSO / OIDC (Okta especially) and JWT‑based session models that span multiple clients
• Experience operating WebSocket fleets at scale – sticky sessions, horizontal scaling, graceful reconnect
• Familiarity with Nx, pnpm workspaces, or comparable monorepo tooling
• OpenAPI‑first development, zod, Vitest, Playwright, Testcontainers, k6
• Comfort writing or reading Terraform

Benefits:

• Flexible working hours
• Supplemental health insurance
• Professional development stipend
• $500 WFH tech set‑up reimbursement

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.