engineering
Posted Jun 22Senior Payments Engineer — Acquiring & Payment Processing
at Sezzle
ArgentinaRemote
Responsibilities
- Design and build backend services in Golang that integrate with payment processors, gateways, and card networks
- Own critical money-movement flows end to end: authorization, capture, settlement, refunds, reconciliation, and chargeback/dispute handling
- Build idempotent, fault-tolerant, auditable transaction processing within a distributed architecture (transactional outbox patterns; queues such as Kafka, SQS, or RabbitMQ)
- Instrument and monitor payment health: authorization/decline rates, processor performance, latency, and settlement accuracy, driving continuous improvement
- Mentor engineers and help raise the bar across the team Demonstrated
Requirements
- Operate within PCI DSS scope — tokenization, network tokens, secure handling of payment data, and 3DS/SCA flows where applicable
- Use 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 policies
- experience working with Claude or equivalent large language model tools is required; candidates must be comfortable leveraging AI to enhance productivity, research, and communication.
- Strong Go (preferred), or comparable
- experience in Python, building and serving REST APIs Hands-on
- experience integrating with payment processors, gateways, or acquiring systems, and familiarity with payments fundamentals: authorization vs. settlement, tokenization, idempotency, reconciliation, and chargebacks/disputes •
- Experience 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 output
- Bachelor's degree in Computer Science, Engineering, or a related field.
- Experience with SQL based RDMS through an ORM tool
- DevOps experience with CI/CD pipelines
- Familiarity with containerized micro-service architecture deployed with Kubernetes on AWS
- Demonstrated history of delivering commercial APIs and web applications
- 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
- 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. About You:
- 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
Experience
- 7+ years of backend or full-stack engineering experience, with meaningful time spent on payments, fintech, or money-movement systems
Benefits
- The salary range for this role is $5,000 - $9,500 per month (Gross in USD) About Sezzle:
- experience for consumers and merchants alike, come join us at Sezzle and help create the future of shopping! Compensation :
- For this senior development role, with 8+ years of experience, the compensation range is $5,000 - $9,500 USD per month.
- This range acknowledges the extensive expertise, leadership capabilities, and significant contributions expected at this level, offering a competitive salary to reflect the value of advanced skills and experience.
- You earn trust - you listen attentively, speak candidly, and treat others respectfully.
- Our culture is not defined by a certain set of perks designed to give the illusion of the traditional startup culture, but rather, it is the visible example living in every employee that we hire.
Additional details
- With a mission to financially empower the next generation, Sezzle is revolutionizing the shopping
- experience beyond payments, blending cutting-edge tech with seamless, interest-free installment plans that make shopping smarter and more accessible.
- We’re not just transforming payments; we’re redefining how people discover, interact with, and purchase the things they love while driving real impact on merchant sales through increased conversions and higher order values.
- As we continue to shape the future of fintech and retail, we’re building an innovative, dynamic team passionate about creating more than just a transaction but a truly unique shopping journey.
- If you’re excited about pushing boundaries in tech and delivering a game-changing
- 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.
- 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.
- Comfortable using observability platforms like Prometheus, or vendor solutions like NewRelic or Datadog to instrument your code for production monitoring and alerting.
- A clear record of getting products to market and prioritizing solutions and improvements based on stakeholder/customer feedback. Nice to Have Direct