Senior Software Engineer, Integrations & APIs at Scale

PostGrid Inc.; Toronto; Hybrid; CAD 120,000 - 170,000; Full time

Benefits offered by this job

Competitive pay

Flexible work

Learning & mentorship

Job summary

PostGrid is building the bridge between digital and physical mail at scale. As a Senior Software Engineer on the Integrations team, you’ll lead and contribute across backend and frontend systems, enabling customers to use our product without leaving their stack.

You will design robust REST APIs, own integration workflows with CRM/ERP platforms, and drive reliability for billions of monthly requests. We value pragmatic, full‑stack engineers who ship fast, code cleanly, and collaborate across

Qualifications

• 5+ years of software engineering experience as full stack with a strong focus on integrations, APIs, or platform engineering.
• Strong proficiency in TypeScript, NodeJS, MongoDB
• Experience with scalable architecture, high load applications
• Hands-on experience building integrations with CRM/ERP platforms and other 3rd-party systems and internal platforms
• Solid understanding of REST APIs, webhook patterns and event-driven systems

Responsibilities

• Full-Stack Development: Build and enhance integration services using TypeScript, NodeJS, MongoDB, and React, AWS, Terraform with a strong emphasis on modern software engineering best practices.
• API Development: Design and iterate on REST APIs and infrastructure that handle over one billion requests monthly, ensuring they are robust, reliable, and integration-ready.
• Platform Integrations: Develop and maintain the integration layer between PostGrid's core platform and third-party ecosystems. This includes designing scalable data pipelines for CRM and ERP platforms, debugging and resolving integration failures at the API and data layer, and engineering internal tooling to automate partner onboarding and system monitoring.
• Partner & Integration Advocacy: Own the technical relationship with key integration partners. This includes reviewing integration architecture, identifying failure points and reliability risks, and driving engineering solutions internally to expand integration coverage, improve uptime, and ensure long-term stability across all connected platforms.

Skills

Full stack software engineering

Integrations

REST APIs

High load systems

1+ other skill

Tools

TypeScript

NodeJS

MongoDB

React

AWS

Terraform

Job description

PostGrid is building the bridge between digital and physical mail at scale. As a Senior Software Engineer on the Integrations team, you’ll lead and contribute across backend and frontend systems, enabling customers to use our product without leaving their stack.

You will design robust REST APIs, own integration workflows with CRM/ERP platforms, and drive reliability for billions of monthly requests. We value pragmatic, full‑stack engineers who ship fast, code cleanly, and collaborate across