Senior Backend / Node.js Engineer (NX + NestJS)

Yochana; Toronto; Hybrid; CAD 120,000 - 160,000; Full time

Job summary

Yochana in Downtown Toronto is seeking a Senior Software Engineer to drive the AVA Modernization program, moving a legacy platform to a cloud-native architecture using NX Monorepo and NestJS services.

This hands-on role includes building a scalable BFF gateway, event-driven microservices, and ingestion workers, with MongoDB for current data and Snowflake for analytics, in a hybrid setup.

Qualifications

• 5-10 years backend engineering experience.
• Strong NestJS (modules, DI, guards, interceptors, pipes, validation).
• NX Monorepo experience with shared libs and dependency graph.

Responsibilities

• Build and scale services in a single NX Monorepo with shared libs and CI/CD.
• Develop a NestJS BFF Gateway for multiple frontends with JWT/OBO token handling.
• Implement internal NestJS microservices with clear domain ownership and independent deployment.
• Build ingestion services consuming external events and persisting data.
• Develop async workers processing internal events for side effects.
• Use MongoDB for operational data and Snowflake for analytics.
• Create shared libs and contracts (DTOs, events, auth utilities).
• Ensure testing, observability, performance, and reliability standards.

Skills

NestJS expertise

NX Monorepos

TypeScript/Node.js

Event-driven architecture

API contracts design

BFF orchestration

MongoDB

Tools

NX Monorepos tooling

Job description

Position Name – Senior Software Engineer (NX + NestJS)

Type of hiring – Fulltime/Subcon

Location – Downtown Toronto, ON – Hybrid (3 days office, 2 days remote)

In-person interview in Downtown Toronto, Canada

Job Description:

Seeking 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.
• 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.