Senior Fullstack Engineer, Customer Context New

Postscript; Ottawa; Hybrid; CAD 249,000 - 292,000; Full time

Benefits offered by this job

Equity

Work from home

Flexible paid time off

Job summary

Postscript is the AI messaging platform trusted by 20,000+ Shopify brands and fully remote since 2018. We seek a Senior Fullstack Engineer to own customer context systems, APIs, and AI-powered workflows, blending backend strength with data-intensive, scalable design.

This is a high-autonomy role with deep ownership and an AI-first approach to engineering. The position is fully remote and can be based in the US or Canada.

Qualifications

• 6+ years building large-scale data-intensive backend systems and APIs.
• Active daily user of AI coding tools (Claude Code, Codex, Cursor, Copilot).
• Experience with event-driven distributed systems and AWS/Kubernetes.

Responsibilities

• Own systems and be the go-to technical expert for your area.
• Design and implement scalable REST APIs and backend services.
• Drive decoupling, modularization and technical debt reduction.
• Build agentically with autonomous AI workflows and tooling.
• Stay current with AI tooling and bring it into practice.
• Collaborate asynchronously with product, data, and GTM teams.
• Identify and eliminate single points of failure; improve resilience.
• Develop internal utilities to improve engineering efficiency.

Skills

AI tooling usage

Distributed systems

REST APIs

SQL

Multi-language

Code quality

Tools

Kafka

Flink / Spark

Terraform

Datadog

Signoz

AWS

Kubernetes

Job description

Senior Fullstack Engineer, Customer Context

Remote

Postscript is the AI messaging platform trusted by 20,000+ Shopify brands — including Brooklinen, Ruggable, True Classic, and Dr. Squatch.

With a mission to make SMS your number one revenue driving channel, we built the best-in-class SMS marketing platform and launched revenue-driving AI features not available on any other platform. And we're just getting started.

Backed by Greylock and Y Combinator, fully remote since 2018.

We are looking for a polyglot Senior Fullstack Engineer to join the Customer Context team. You’ll help build and scale the foundational services, APIs, and pipelines that power the Postscript product. This role blends strong backend engineering skills with a deep appreciation for data intensive systems, performance, and reliability. You’ll collaborate closely with other software engineers, data engineers, and product to help e-commerce marketers maximize their revenue with best-in-class targeting and context-driven AI.

This is a high-autonomy role for engineers who are energized by ambiguity, take genuine ownership of their work, and bring a strong point of view on how to build things well, without sacrificing speed or pragmatism. AI isn't a nice-to-have here — it's central to how we work. We expect our engineers to be active practitioners of AI-first development: fluent with the latest agentic coding tools, curious about what's emerging, and constantly pushing the boundary of what's possible with AI in their day-to-day craft. If you're the kind of engineer who's already experimenting with new models and tooling before anyone asks you to, you'll feel at home here.

As a senior engineer at Postscript, you’ll no longer be only writing code but orchestrating it.

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

What You’ll Do

• Take deep ownership of systems and product areas on your team, and become the go-to technical expert for what you own
• Independently investigate, design, and execute solutions across distributed systems with a high degree of ambiguity
• Architect, build, and maintain highly available, scalable REST APIs and backend services for internal and external use
• Drive system decoupling, modularization, and technical debt reduction.. Improve long-term maintainability without blocking near-term delivery
• Build agentically as your default: leveraging concurrent autonomous agent workflows, owning the output, and keeping a steady queue of aligned work moving
• Stay at the forefront of emerging AI tooling and practices, bringing new techniques back to the team and helping raise the floor for how Postscript engineers work
• Contribute to how we think about integrating AI into our systems and workflows. That means not just using AI tools, but helping shape where and how AI creates leverage across the engineering org
• Collaborate cross-functionally with product, data, and go-to-market teams by communicating clearly and proactively in an async-first environment
• Identify and eliminate single points of failure, improving system resilience and knowledge redundancy across your team
• Improve how engineering gets done: bring better tools, fix workflow friction, build internal utilities when the leverage compounds

What We’re Looking For

• 6+ years of experience building large-scale data-intensive backend systems and APIs
• You are an active, daily user of AI coding tools and are using them to maximize your output — Claude Code, Codex, Cursor, Copilot, or equivalent — and can speak concretely to how they've changed your output and your workflow
• Some or all of these languages: Python, Go, Rust, React, and TypeScript
• You follow the AI tooling landscape closely: new model releases, emerging agentic workflows, and evolving best practices aren't things you catch up on eventually.
• You think critically about AI output and you know where it accelerates you, where it introduces risk, and how to verify what it produces
• You are able to context switch quickly across concurrent workstreams
• Experience working on both 0-to-1 initiatives and complex existing systems, and knowing how to balance building new things with improving what's there
• You have working knowledge of event-driven distributed systems, Kafka, and familiarity with distributed data processing technologies (Flink/Spark/etc)
• Experience growing systems under production customer load, ideally from early days to the multi-terabyte stage
• Experience building and designing high-scale systems AWS with a broad variety of database technologies (RDBMS, OLAP, NoSQL, etc.)
• You know how to intelligently model relational data and design index strategies. You write performant SQL for transactional and analytical workloads
• Experience with infrastructure as code (eg, Terraform). You are comfortable evaluating and applying your infra changes.
• Familiarity building and observing applications on AWS & Kubernetes, ideally with Datadog, Signoz, or comparable observability tooling
• Clear, direct communication. Cross-functional partners and async teams can count on you to surface information proactively
• Strong instincts for technical tradeoffs informed by both engineering best practices and business priorities

What You’ll Love About Us

• Salary range of USD $175,000–$205,000 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 in US / Canada)
• Fun — we're passionate and enjoy what we do
• Competitive compensation and opportunity for equity
• Flexible paid time off

For information about how we use your personal data, please see our U.S. Job Applicant Privacy Notice

You are welcome here. Postscript is an ever-evolving place of equal employment for talented individuals.

Postscript Demographic Questions and Categorizations

At Postscript, we are committed to creating an inclusive workplace that values diversity. We firmly believe that companies diverse in, for example, age, gender identity, race, sexual orientation, ethnicity, and perspective are better because of it. However, even beyond that belief, we simply want to strive for what's right.

For this reason, we are asking candidates to voluntarily self-identify through a few demographic questions. Our purpose in collecting this information is to help us assess our outreach efforts and diversity representation goals. Your responses will not be linked to your identity or your application, and neither recruiters nor hiring managers can see this information at an individual level. Your responses are stored in the aggregate and will not play any role in our hiring decision. Your decision to participate or not participate in this survey will have no impact on your candidacy at Postscript.

Voluntary Self-Identification

For government reporting purposes, we ask candidates to respond to the below self-identification survey.Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiringprocess or thereafter. Any information that you do provide will be recorded and maintained in aconfidential file.

As set forth in Postscript’s Equal Employment Opportunity policy,we do not discriminate on the basis of any protected group status under any applicable law.

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection.As a government contractor subject to the Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measurethe effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categoriesis as follows:

A "disabled veteran" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service-connected disability.

A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.