Senior Payments Engineer — Acquiring & Payment Processing

• Direct experience with payments acquiring ecosystem like; Adyen, Stripe, Marqeta, Fiserv, etc.
• Exposure to PCI DSS, 3DS/SCA, network tokenization, or payments compliance
• SQL-based RDBMS through an ORM
• Observability platforms (Prometheus, Datadog, New Relic) for production instrumentation and alerting
• DevOps / CI/CD pipeline experience; containerized microservices on Kubernetes / AWS
• A track record of shipping commercial payment APIs and prioritizing based on stakeholder/customer feedback

AI at Sezzle

Sezzle runs an AI-first product and engineering culture — we start projects in Claude and expect engineers to use AI to move faster and think more rigorously. In a payments environment, we do this responsibly: AI tools accelerate how we design, build, and document, but cardholder data, credentials, and secrets never leave our secured environment. We're looking for someone who treats AI fluency and secure-by-default engineering as two sides of the same skill.

• many people may think your standards are unreasonably high. You are continually raising the bar and driving those around you to deliver great results. You make sure that defects do not get sent down the line and that problems are fixed so they stay fixed.
• You’re not bound by convention - your success—and much of the fun—lies in developing new ways to do things
• You need action - speed matters in business. Many decisions and actions are reversible and do not need extensive study. We value calculated risk-taking.
• You earn trust - you listen attentively, speak candidly, and treat others respectfully.
• you can respectfully challenge decisions when you disagree, even when doing so is uncomfortable or exhausting. You have conviction and are tenacious. You do not compromise for the sake of social cohesion. Once a decision is determined, you commit wholly.
• You deliver results - you focus on the key inputs and deliver them with the right quality and in a timely fashion. Despite setbacks, you rise to the occasion and never settle.

Sezzle’s Technology Stack:

• Languages: Golang, Typescript, Python
• Frontend: Typescript - React and React Native
• Backend: Golang
• Database: MySQL, Postgres, Elasticsearch
• DevOps & Cloud: AWS, Kubernetes
• Version Control: Git
• CI/CD: Gitlab
• Testing: Developer-driven, focus on automated unit, integration, and end-to-end tests
• Sezzle is focused on using open source, and we build what we can before buying!
• Experience with SQL based RDMS through an ORM tool
• Comfortable using observability platforms like Prometheus, or vendor solutions like NewRelic or Datadog to instrument your code for production monitoring and alerting.
• Familiarity with containerized micro-service architecture deployed with Kubernetes on AWS
• Demonstrated history of delivering commercial APIs and web applications
• A clear record of getting products to market and prioritizing solutions and improvements based on stakeholder/customer feedback.