Backend Developer – TypeScript/Node.js, NestJS & Kafka

Senior Software Engineer – NX, NestJS, TypeScript/Node.js, Kafka & MongoDB

Toronto, ON - Hybrid (4 Days WFO)

Experience: 8+ years in software engineering with strong hands-on experience in TypeScript/Node.js NestJS and NX monorepo delivery

Role Summary

We are hiring a senior 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.