Senior Platform Engineer (Java/NodeJS) for our Fintech client that provides institutional-grade crypto

Contract: 6 Months +

Work Model: 3 Days Onsite in Toronto, Ontario

Hours: 37.5

Day-to-Day (D2D) Responsibilities

• Design, build, and maintain platform systems supporting backend services (NodeJS/Java).
• Improve platform-level components: CI/CD pipelines, AWS infrastructure, messaging systems (Kafka), and developer tooling.
• Support app developers by managing non-functional complexity (performance, scalability, reliability).
• Migrate legacy services to modern architecture without downtime.
• Collaborate with cross-functional teams on architectural decisions and long-term platform improvements.
• Document processes and communicate with both technical and non-technical stakeholders.

Must-Haves

• 10+ years backend, platform, or infrastructure engineering experience; Staff-level or equivalent.
• Strong proficiency in Java, NodeJS, TypeScript, JavaScript, with working knowledge of the others.
• Platform architecture experience: performance tuning, CI/CD, infrastructure-as-code (Terraform, Docker, Kubernetes).
• Experience with messaging/event systems (Kafka, Solace, or similar).
• AWS experience (ECS, Lambda, S3, etc.).
• Strong problem-solving, design, and architecture skills.
• Ability to operate independently and lead system-wide initiatives.
• Excellent documentation and communication skills.

Plusses / Nice-to-Haves

• Experience in fintech, trading, or capital markets.
• Front-end framework exposure (React) to support platform/app integration.
• Familiarity with microservices observability, SQL/NoSQL databases, and event-driven architectures.
• Interest in AI/automation tools for engineering workflows.
• Experience leading platform modernization or language migrations (e.g., JS Java).