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Senior Payments Engineer — Acquiring & Payment Processing

3 months, 2 weeks ago
Colombia
Full-time
Senior
Backend Engineer
Software Development
AWS CI/CD Datadog Elasticsearch Git GitLab Go Kafka Kubernetes LLM Microservices MySQL New Relic PostgreSQL Prometheus Python RabbitMQ React React Native REST API SQL TypeScript
Apply Now
Sezzle

Sezzle

Sezzle is a payments company revolutionizing the buy now, pay later experience with interest-free installment plans, empowering consumers and merchants alike.

Diversified Financial Services
251-1K
Founded 2016
View All Jobs 94

Description

  • Design and build backend services in Golang for payment processors, gateways, and card network integrations.
  • Own end-to-end money movement flows including authorization, capture, settlement, refunds, reconciliation, and chargeback handling.
  • Build idempotent, fault-tolerant, auditable transaction processing in distributed systems using queues and transactional outbox patterns.
  • Operate within PCI DSS scope by handling tokenization, network tokens, secure payment data, and 3DS/SCA flows as needed.
  • Instrument and monitor payment health metrics such as authorization rates, decline rates, processor performance, latency, and settlement accuracy.
  • Partner with Product, Risk, Compliance, Support, and other engineering teams to deliver scalable solutions.
  • Mentor engineers, unblock peers, and help raise the technical bar across the team.
  • Occasionally lead small project teams to delivery.
  • Use AI tooling such as Claude or equivalent LLMs to accelerate design, coding, research, testing, and documentation within security policies.

Requirements

  • 7+ years of backend or full-stack engineering experience, with meaningful experience in payments, fintech, or money-movement systems.
  • Strong Go experience preferred, or comparable experience in Python building REST APIs.
  • Hands-on experience integrating with payment processors, gateways, or acquiring systems.
  • Strong understanding of payments fundamentals including authorization vs. settlement, tokenization, idempotency, reconciliation, and chargebacks/disputes.
  • Experience with distributed, cloud-based architectures using transactional outboxes or queueing tools such as Kafka, SQS, or RabbitMQ.
  • Demonstrated hands-on use of Claude or an equivalent LLM to improve productivity, research, and communication.
  • Bachelor's degree in Computer Science, Engineering, or a related field.
  • Experience with SQL-based RDBMS through an ORM tool, observability platforms, CI/CD pipelines, or containerized microservices on Kubernetes and AWS is preferred.
  • Experience with payments acquiring ecosystems such as Adyen, Stripe, Marqeta, or Fiserv is preferred.
  • Exposure to PCI DSS, 3DS/SCA, network tokenization, or payments compliance is preferred.

Benefits

  • Salary range of $5,000 - $9,500 USD per month, gross.
  • Full-time remote role.
  • Opportunity to work on high-impact fintech and payment infrastructure at Sezzle.
  • AI-first engineering environment with Claude and other LLM tools integrated into daily workflow.
  • Open-source-oriented engineering culture that builds in-house where possible.
  • Chance to work with modern cloud and payments technologies in a high-ownership role.

Interested in this position?

Apply directly on the company website

Apply Now

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