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 featuresAdvise on technologies and present solutions to the teamTake on legacy architecture and digital transformation projectsExpand our Node services suite of applicationsDocument any new and undocumented processes and workflowsWork in a start‐up environment with lots to do and wear many hatsAssist in building tools to ensure a high‐quality end‐user productHelp us scale to tens of millions of customers & connected devicesWhat 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 onPrior 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 testsStrong React – modern hooks‐era React; you've shipped non‐trivial SPAs and know how to keep them quick under real load. Bonus if you've worked with React Native (especially native module / push / deep‐link plumbing) or built embeddable / drop‐in componentsExperience with relational data modeling and SQL (Postgres preferred). You know what an index does and when it doesn'tComfort with real‐time systems – WebSockets, pub/sub, presence, reconnection, backpressure.



You understand why at‐least‐once delivery is a different problem from exactly‐onceExperience 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 doingSolid API design instincts – REST contracts, versioning, OpenAPI / typed clients, idempotency, paginationCare about security and compliance. You'd push back if someone proposed logging message bodies to CloudWatchA bias toward clean, appropriately tested code and clear written communication – specs, ADRs, PR descriptions that explain the whyStrong communication and writing – most of our coordination is async and in‐docAn ability and desire to help teammates grow through mentorship and code reviewBonus Points:Experience with React Native beyond the JS surface – bridging modules, push tokens, background state, keyboard / safe‐area edge casesExperience designing or operating systems with CPNI / HIPAA / PCI / SOC 2 compliance constraintsExperience with SSO / OIDC (Okta especially) and JWT‐based session models that span multiple clientsExperience operating WebSocket fleets at scale – sticky sessions, horizontal scaling, graceful reconnectFamiliarity with Nx, pnpm workspaces, or comparable monorepo toolingOpenAPI‐first development, zod, Vitest, Playwright, Testcontainers, k6Comfort writing or reading TerraformBenefits:Flexible working hoursSupplemental health insuranceProfessional development stipend$500 WFH tech set‐up reimbursementWe 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.

📌 Full-Stack Software Engineer (Montreal)
🏢 Us Mobile
📍 Montreal