About this role
Job Description 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.
Requirements Top 3 Required Skills: 1. IBM Financial transaction 2. Payment flow 3. Support Modernization Detailed Job Description: ? Design, develop, and maintain applications built on IBM Financial Transaction Manager (FTM) to support core payments processing. ? Contribute to the development of payment flows supporting transaction processing. ? Build and support integrations