Senior Backend Engineer

Senior Backend Engineer - App Systems Team

As a Senior Backend Engineer on the App Systems team, you'll be a high-ownership contributor to Fondue — Postscript's cashback, discounting, and incentives product — as well as broader offers and incentives infrastructure across the platform. App Systems owns some of Postscript's most critical systems: billing, entitlements, onboarding, and core merchant data. This role sits at the center of high-margin revenue and a product with a competitive, high-visibility roadmap.

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 that allow Fondue 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.

Primary Duties

• Take ownership of the Fondue 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