Latin AmericaThe salary range for this role is $5,000 - $9,500 per month (Gross in USD)About the Role:We're hiring a Senior Payments Engineer to own and scale the systems at the heart of Sezzle's acquiring and payment-processing stack — the services that integrate with processors and gateways (Stripe, Adyen, Fiserv, Plaid, and more partners from the broader acquiring ecosystem), move funds, and keep transactions accurate, auditable, and resilient.This is a backend-focused, high-ownership role.You'll partner closely with Product, Risk, Compliance, and Support, as well as other engineering teams, to deliver scalable solutions to hard problems in authorization, settlement, reconciliation, and disputes.You'll mentor teammates, unblock peers, and occasionally lead small project teams to delivery.What You'll DoDesign and build backend services in Golang that integrate with payment processors, gateways, and card networksOwn critical money-movement flows end to end: authorization, capture, settlement, refunds, reconciliation, and chargeback/dispute handlingBuild idempotent, fault-tolerant, auditable transaction processing within a distributed architecture (transactional outbox patterns; queues such as Kafka, SQS, or RabbitMQ)Operate within PCI DSS scope — tokenization, network tokens, secure handling of payment data, and 3DS/SCA flows where applicableInstrument and monitor payment health: authorization/decline rates, processor performance, latency, and settlement accuracy, driving continuous improvementUse AI tooling (Claude and equivalent LLMs) as part of your daily workflow to accelerate design, coding, research, testing, and documentation — within Sezzle's security and data-handling policiesMentor engineers and help raise the bar across the teamDemonstrated experience working with Claude or equivalent large language model tools is required; candidates must be comfortable leveraging AI to enhance productivity, research, and communication.What We Look For7+ years of backend or full-stack engineering experience, with meaningful time spent on payments, fintech,



or money-movement systemsStrong Go (preferred), or comparable experience in Python, building and serving REST APIsHands‐on experience integrating with payment processors, gateways, or acquiring systems, and familiarity with payments fundamentals: authorization vs. settlement, tokenization, idempotency, reconciliation, and chargebacks/disputesExperience in distributed, cloud-based architectures using patterns like transactional outboxes or queuing tools (Kafka, SQS, RabbitMQ)Demonstrated, hands‐on use of Claude or an equivalent LLM to enhance productivity, research, and communication — you're comfortable making AI a core part of how you work and can show how it's improved your outputBachelor's degree in Computer Science, Engineering, or a related field.Preferred Knowledge and SkillsExperience with SQL based RDMS through an ORM toolComfortable using observability platforms like Prometheus, or vendor solutions such as NewRelic or Datadog to instrument your code for production monitoring and alerting.DevOps experience with CI/CD pipelinesFamiliarity with containerized micro‐service architecture deployed with Kubernetes on AWSDemonstrated history of delivering commercial APIs and web applicationsA clear record of getting products to market and prioritizing solutions and improvements based on stakeholder/customer feedback.Nice to HaveDirect experience with payments acquiring ecosystem like; Adyen, Stripe, Marqeta, Fiserv, etc.Exposure to PCI DSS, 3DS/SCA, network tokenization, or payments complianceSQL-based RDBMS through an ORMObservability platforms (Prometheus, Datadog, New Relic)



for production instrumentation and alertingA track record of shipping commercial payment APIs and prioritizing based on stakeholder/customer feedbackAI at SezzleSezzle 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.About YouYou have relentlessly high standards - 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 thingsYou 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 have backbone; disagree, then commit - 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.Languages: Golang, Typescript, PythonFrontend: Typescript - React and React NativeVersion Control: GitCI/CD: GitlabTesting: Developer‐driven, focus on automated unit, integration, and end‐to‐end testsSezzle is focused on using open source, and we build what we can before buying!
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📌 Senior Payments Engineer — Acquiring & Payment Processing (Xico)
🏢 Sezzle
📍 Xico