Senior Software Engineer - Logistics

About PostGrid: PostGrid is a global leader in enterprise SaaS platform for automated offline communications. Our robust APIs empower organizations to create, personalize, and dispatch physical mail letters, postcards, checks, and more to any address on the globe without ever touching an envelope, while ensuring clean address data. Operating at massive scale across multiple regions, we’re redefining how brands 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-caliber team and help us transform the way the world sends mail. About The Team: The Engineering team is the technological 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 microservices 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, you will be a key contributor to our core product, responsible for both technical leadership and hands-on development. You'll build the critical backend systems and data pipelines that handle millions of orders and power our global offline communication platform. This role requires a pragmatic backend engineer who can contribute to all stages of the software development lifecycle, from architectural design to implementation and ongoing maintenance. Your Responsibilities: - API Design: Architect and maintain scalable REST APIs that can serve a multitude of use cases without breaking backwards compatibility. - Backend Engineering: Optimize existing Node.js services by unlocking performance opportunities with Rust. - Data & Logistics: Build ETL workflows to route millions of orders across our growing network of partners. - Internal Tooling: Create internal tools that enable our sales and logistics teams to better serve our customers. - Developer Enablement: Write clear API documentation and guides that enable developers to better use our APIs. - Strategic Collaboration: Work closely with our product managers and customers to ensure your work translates into business impact. You’ll also collaborate with our founders to generate growth ideas and improve existing processes. What Will You Bring To This Role: You are a pragmatic and experienced backend engineer with a passion for solving complex, large-scale data and logistics challenges. You have a track record of building and shipping high-quality software and thrive in a collaborative, fast-paced environment where you're dedicated to helping both your team and your customers succeed. Minimum Requirements: - 5+ years of backend software engineering experience, ideally with Node.js, Python, or a similar language. - Professional experience building APIs with Node.js, TypeScript, and MongoDB. - Experience writing API documentation and communicating with customers. - Experience working with automated testing frameworks such as Jest and Vitest. - Strong technical writing skills, ideally demonstrable through project or customer-facing documentation. - Professional experience creating frontends with TypeScript and React. Preferred Qualifications: - Experience with Rust/C/C++. - Experience working with AWS Lambda, S3, SQS, Batch, etc. 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 communications. 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? Apply today and help us reinvent how the world connects beyond the inbox.