Senior Software Engineer-Integration

PostGrid; Toronto; Hybrid; CAD 120,000 - 180,000; Full time

Benefits offered by this job

Flexible work

Competitive pay

Learning-focused culture

Job summary

PostGrid in Toronto, Ontario seeks a Senior Software Engineer on the Integrations team to lead and code across backend and frontend. You will build core systems enabling customers to use the product within their stack, shaping architecture and maintaining high-quality deliverables.

The role demands hands-on full-stack work with TypeScript, NodeJS, MongoDB, AWS, and REST APIs, plus experience with large-scale, multi-tenant integrations and partner onboarding.

Qualifications

• 5+ years of software engineering experience as full stack with integrations focus.
• Strong proficiency in TypeScript, NodeJS, and MongoDB.
• Experience with scalable architecture and high-load applications.
• Hands-on experience building integrations with CRM/ERP platforms and other 3rd-party systems.

Responsibilities

• Full-Stack Development: Build and enhance integration services using TypeScript, NodeJS, MongoDB, React, AWS, Terraform with modern practices.
• API Development: Design REST APIs and infrastructure handling large-scale requests.
• Platform Integrations: Maintain integration layer between PostGrid and third-party ecosystems; design scalable data pipelines.
• Partner & Integration Advocacy: Outline architecture, identify risks, and drive solutions to expand integration coverage and uptime.

Skills

Full-stack development

APIs

Platform engineering

Integrations

REST APIs

Tools

TypeScript

NodeJS

MongoDB

AWS

Terraform

React

Job description

PostGrid helps businesses and developers connect the digital and physical worlds. Our robust APIs empower organizations to create, personalize, and dispatch physical mail to any address on the globe without ever touching an envelope, while ensuring clean address data. Operating at a massive scale across multiple regions, we're redefining how businesses connect with people beyond the inbox. If you're driven to build category-defining technology and want to shape the future of offline communications, join our high-calibre team and help us transform the way the world sends mail.

About The Team:

The Engineering team is the heartbeat of our company. We are a passionate group of builders and innovators dedicated to solving complex problems and creating elegant, scalable solutions. We thrive on technical challenges, from architecting robust services to optimizing performance for a global user base. We believe in collaborative code reviews, a culture of continuous learning, and owning our projects from conception to deployment.

What you'll do:

As a Senior Software Engineer on the Integrations team, you will be a key contributor to our integrations, responsible for both technical leadership and hands‑on development. You'll build the critical backend and frontend systems that allow our customers to use our product without leaving their stack. This role requires a pragmatic fullstack software engineer who can contribute to all stages of the software development lifecycle, from architectural design to implementation and ongoing maintenance.

Your 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.

What Will You Bring To This Role:

• 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

Nice to have:

• Experience with MongoDB in a multi‑tenant SaaS environment.
• Experience with programming languages like Rust to solve performance‑intensive engineering challenges and tasks

What we offer:

Deep architectural control with a role in shaping the company's critical platform integrations.

Professional development opportunities, including mentorship from senior leaders and access to advanced training programs.

A collaborative environment focused on achieving excellence and driving innovation.

Our Commitment to Diversity:

PostGrid is an equal opportunity employer and values the diversity of backgrounds and perspectives. We strive to cultivate an inclusive environment of understanding to have a greater impact on our business and our customers. We encourage applicants from underrepresented groups and do not discriminate on the basis of race, religion, color, national origin, gender, sexual orientation, age, marital status, veteran status, disability status, or criminal history, in accordance with applicable local, state, and/or federal laws.

Ready to make your mark?

Join PostGrid's tight-knit, high-energy team and build technology that powers global offline communication. With competitive pay, flexible work, and a learning-obsessed culture, you'll ship bold ideas fast and see your impact instantly. Hungry for a challenge?