Senior Backend Engineer

HRB; Toronto; On-site; CAD 100,000 - 130,000; Full time

Job summary

A fintech company in Toronto seeks a Senior Backend Engineer to build and scale their payment infrastructure. The role requires 4+ years of experience in backend engineering, strong skills in NestJS, TypeScript, and compliance with financial regulations. Responsibilities include designing ledger systems and integrating financial APIs. Join a high-stakes environment where ownership of critical systems is essential.

Qualifications

• 4+ years of backend engineering experience, with 2+ years in fintech or payments.
• Expert-level with NestJS/Node.js and TypeScript for building production APIs.
• Hands-on experience with ledger systems, double-entry bookkeeping, or financial data modeling.

Responsibilities

• Build and scale backend services using NestJS and TypeScript on Google Cloud Platform.
• Design and maintain robust ledger systems and financial data models.
• Integrate with financial APIs and ensure PCI compliance.

Skills

NestJS/Node.js

TypeScript

PostgreSQL

Google Cloud Platform

Database optimization

PCI compliance

Microservices

Terraform

Tools

Google Cloud SQL

PubSub

Job description

About the Role

We're looking for a Senior Backend Engineer with deep fintech experience to join our core engineering team. You'll be responsible for building and scaling the critical payment infrastructure, ledger systems, and financial APIs that power our platform. This is a backend-focused role where you'll work on high-stakes financial systems processing millions of dollars in transactions daily.

You'll work closely with our CTO and engineering team to architect reliable, compliant, and scalable financial systems that our users depend on for their most important payments.

In this role, you’ll

• Build and scale backend services using NestJS and TypeScript on Google Cloud Platform
• Design and maintain robust ledger systems and financial data models using Google Cloud SQL and PostgreSQL
• Architect and optimize payment processing pipelines handling large transaction volumes
• Integrate with financial APIs, payment processors, and banking systems while ensuring PCI compliance
• Build resilient microservices with PubSub for event-driven architecture
• Manage infrastructure as code using Terraform and GCP services
• Own critical financial systems end-to-end, from design to production monitoring
• Collaborate with product and compliance teams to ship secure, compliant financial features

You’re someone who

• Has 4+ years of backend engineering experience, with 2+ years in fintech or payments
• Is expert-level with NestJS/Node.js and TypeScript for building production APIs
• Has hands-on experience with ledger systems, double-entry bookkeeping, or financial data modeling
• Has scaled backend systems handling high transaction volumes (millions of transactions/month)
• Is proficient with PostgreSQL, database optimization, and Google Cloud Platform
• Has experience with payment processing, financial APIs, and regulatory compliance (PCI, SOC 2, etc.)
• Brings strong ownership to critical systems and thrives in a high-stakes fintech environment
• Communicates clearly about complex technical and financial concepts

Required experience

• Fintech/payments industry experience with large-scale transaction processing
• Ledger systems or accounting system development
• Financial API integrations (payment processors, banks, card networks)
• Database design for financial systems and audit trails
• GCP services (Cloud SQL, PubSub, Cloud Run, etc.)

Nice-to-haves

• Experience with Terraform for infrastructure management
• PCI DSS compliance and security framework experience
• Real-time payment systems or instant settlement experience
• Previous experience at high-growth fintech companies
• Open banking or financial data aggregation experience