Trusted by more than 20,000+ Shopify and Shopify Plus stores—like Brooklinen, Ruggable, True Classic and Dr. Squatch—Postscript gives ecommerce brands the tools they need to run a world-class SMS marketing program.

We’re on a mission to make SMS the number-one revenue channel for ecommerce merchants by delivering an easy-to-use platform where they can grow their subscriber list, develop and test their messaging strategy, deliver excellent customer service, and drive sales and loyalty—all in one place. We believe SMS is the most important marketing and sales channel of the decade, and that vision drives everything we do.

Postscript was founded in 2018 as a 100% remote organization. With more than 250 employees (and counting!), we’re backed by Greylock, Y Combinator, and other top investors.

As a Senior Software Engineer, Full Stack you will use your expertise and passion for building scalable and extensible distributed systems to help enhance our core platform and message orchestration platform, enabling our customers to engage their subscribers through conversational messaging. As a technical leader you will set the bar for the maintainability and performance of our systems. You will be given the autonomy to solve difficult technical problems, to grow professionally, and your work will directly impact our customers and Postscript’s bottom line.

You'll be working on evolving, distributed systems with significant greenfield opportunity — implementing AI-first development practices, decoupling monolithic dependencies, and driving the technical standards to scale alongside Postscript's core platform. This is a high-autonomy role that demands independent investigation, strong technical design instincts, and the ability to move fast without sacrificing system health.

This position is fully remote and can be based in the US or Canada.

Primary Duties

Take ownership of the product and its underlying architecture — becoming the go-to technical expert for cashback, discounting, and incentives systems
Independently investigate, design, and execute solutions across evolving distributed systems with a high degree of ambiguity
Drive system decoupling and modularization — break down monolithic dependencies into flexible, independently deployable components
Implement AI-first coding practices and tooling to reduce cognitive load, accelerate development cycles, and shorten time-to-market for new capabilities
Help Fondue and other subsidiary products adopt Postscript's core tools, data formats, and technical standards to reduce cross-team friction
Architect, build, and maintain highly available, scalable REST APIs for internal and external use
Collaborate cross-functionally with finance and customer support teams — clear, proactive communication is essential in this role
Contribute to process and technical improvements; someone who can quickly ramp on new systems and propose meaningful changes will thrive here
Identify and eliminate single points of failure, improving knowledge redundancy and overall system resilience

What We'll Love About You

4+ years experience building large-scale backend systems and APIs with Typescript experience (Go preferred; Python, Java also valued)
You're experienced with autoscaling strategies for applications deployed on Kubernetes or other container orchestration platforms
You're comfortable — and excited — using agentic coding tools like Claude Code, Cursor, or similar AI-first development tooling
React experience strong nice to have
You've worked on both 0-to-1 initiatives and complex existing systems, and know how to balance building new things with improving what's already there
You have experience with relational and NoSQL databases, SQL, and thoughtful database modeling
You're familiar with building and observing applications on AWS, and ideally Datadog
You communicate with clarity and directness — cross-functional partners and async teams can count on you
You're energized by distributed systems challenges and high-ownership environments
You have strong instincts for technical trade-offs informed by both engineering best practices and business priorities

What You'll Love About Us

Salary range of USD $172,000–$203,000 base plus significant equity (we do not have geo-based salaries)
High growth startup — plenty of room for you to directly impact the company and grow your career
Work from home (or wherever)
Fun — we're passionate and enjoy what we do
Competitive compensation and opportunity for equity
Flexible paid time off
Health, dental, vision insurance