2 months ago
Remote, BrazilSenior
Responsibilities
- Design and build Golang backend services integrating with payment processors, gateways, and card networks.
- Own authorization, capture, settlement, refunds, reconciliation, and chargeback or dispute workflows end to end.
- Build idempotent, fault-tolerant, auditable transaction processing using distributed-architecture patterns and queues.
- Operate within PCI DSS scope, including tokenization, network tokens, secure payment-data handling, and 3DS/SCA flows.
- Instrument and monitor authorization and decline rates, processor performance, latency, and settlement accuracy.
- Use Claude or equivalent LLM tools for design, coding, research, testing, and documentation in accordance with security and data-handling policies.
- Mentor engineers, unblock peers, raise engineering standards, and occasionally lead small project teams.
- Deliver commercial APIs and web applications while prioritizing improvements based on stakeholder and customer feedback.
Requirements
- 7+ years of backend or full-stack engineering experience, including meaningful experience with payments, fintech, or money-movement systems.
- Strong Go experience preferred, or comparable Python experience, building and serving APIs.
- Hands-on experience integrating payment processors, gateways, or acquiring systems and understanding authorization, settlement, tokenization, idempotency, reconciliation, and chargebacks or disputes.
- Experience with distributed, cloud-based architectures using transactional outboxes or queuing tools such as Kafka, SQS, or RabbitMQ.
- Demonstrated hands-on use of Claude or an equivalent LLM to improve productivity, research, communication, and engineering output.
- Bachelor's degree in Computer Science, Engineering, or a related field.
- Experience with SQL-based relational databases through an ORM.
- Experience with Prometheus, New Relic, Datadog, or comparable observability platforms.
- DevOps and CI/CD pipeline experience.
- Familiarity with containerized microservice architectures deployed with Kubernetes on AWS.
- Preferred experience with acquiring ecosystems and providers such as Adyen, Stripe, Marqeta, and Fiserv.
- Preferred exposure to PCI DSS, 3DS/SCA, network tokenization, and payments compliance.
Benefits
- Full-time remote role.
- Monthly gross compensation of $5,000-$9,500 USD.
- AI-first product and engineering culture using Claude and equivalent tools responsibly.
- Opportunity to work on high-impact payment infrastructure, mentor engineers, and collaborate with Product, Risk, Compliance, Support, and engineering teams.
Tech Stack
Apache KafkaAWSDatadogElasticsearchGitGoKubernetesMySQLPostgreSQLPrometheusPythonRabbitMQReactReact NativeSQLTypeScript
Categories
About Sezzle
Sezzle builds a buy now, pay later platform that lets consumers split purchases into interest-free installments online and in stores, integrated with e-commerce and retail merchants. The company earns revenue from merchant fees and related consumer charges and provides underwriting and payment processing services. Founded in 2016 and headquartered in Minneapolis, Sezzle is a public company dual-listed on Nasdaq and the ASX.