Backend developer • north york on
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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 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.
