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J M Group Inc
Senior Software Engineer (NX + NestJS)J M Group Inc • Toronto, ON, Canada
Senior Software Engineer (NX + NestJS)

Senior Software Engineer (NX + NestJS)

J M Group Inc • Toronto, ON, Canada
2 days ago
Job type
  • Full-time
  • Quick Apply
Job description

We are looking for a senior software engineer to help deliver the AVA Modernization program, moving a legacy platform to a cloud-native architecture using NX monorepo, NestJS services, event-driven integration, and MongoDB/Snowflake data patterns. This is a hands-on role with architecture influence across BFF, microservices, ingestors, and workers.

Key Responsibilities

  • Build and scale services within a single NX monorepo using shared libraries and dependency-aware CI/CD.
  • Develop and evolve a NestJS BFF Gateway for multiple frontends, including JWT validation and OBO token exchange with Azure Entra ID.
  • Implement internal NestJS microservices with clear domain ownership and independent deployment.
  • Build ingestion services that consume external events, transform payloads, persist operational data, and publish internal domain events.
  • Develop async workers that process internal events for side effects (notifications, indexing, jobs) without tight service coupling.
  • Contribute to data-layer design:
  • MongoDB for operational/current-state reads
  • Snowflake for analytical/reporting workloads
  • Create and maintain shared libs/ contracts (DTOs, event payloads, auth utilities, API clients, validation rules).
  • Ensure strong testing, observability, performance, and production reliability standards.

Required Qualifications

  • 5-10 years of backend engineering experience.
  • Strong hands-on expertise with NestJS (modules, DI, guards, interceptors, pipes, validation, Swagger/OpenAPI).
  • Practical experience with NX monorepos (shared libs, dependency graph, affected builds/tests).
  • Advanced TypeScript/Node.js skills and API/event contract design.
  • Experience with event-driven systems (Kafka or equivalent), including retries, idempotency, and schema/version evolution.
  • Experience building BFF/API orchestration layers across multiple upstream services.
  • Solid MongoDB experience for low-latency operational workloads.
  • Strong communication and collaboration skills in cross-functional delivery teams.

Preferred Qualifications

  • Ability to navigate and analyze C# and/or Java codebases at a working level - a significant portion of source-of-truth analysis will involve reading and interpreting existing legacy code in these languages to understand current business logic and inform how it should be reshaped to fit the new architecture.
  • Experience with Azure Entra ID and OAuth/OBO flows.
  • Exposure to GraphQL supergraph integrations from BFF layers.
  • Snowflake or similar analytical platform experience.
  • Experience migrating legacy services to containerized/cloud-native architectures.
  • Kubernetes/OpenShift delivery exposure.
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Senior Software Engineer (NX + NestJS) • Toronto, ON, Canada

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