Senior Software Engineer NX NestJS TypeScript/ Kafka & MongoDB
Toronto ON - Hybrid (4 Days WFO)
Experience: 8 years in software engineering with strong hands-on experience in TypeScript/ 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/ 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.
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 between FTM and upstream/downstream systems using enterprise integration patterns. Participate in the design development testing deployment and production support. Troubleshoot and resolve application and integration issues in a complex regulated environment. Collaborate with architecture QA and operations teams to ensure platform stability scalability and performance. Support modernization initiatives and enhancements to existing payment hub capabilities. Produce clear technical documentation and participate in code reviews and knowledge sharing.
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