Senior Payments Engineer — Acquiring & Payment Processing

The salary range for this role is $5,000 - $9,500 per month (Gross in USD)

Compensation:

For this senior development role, with 7+ 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.

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 Do:

• 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)
• Operate within PCI DSS scope — tokenization, network tokens, secure handling of payment data, and 3DS/SCA flows where applicable
• Instrument and monitor payment health: authorization/decline rates, processor performance, latency, and settlement accuracy, driving continuous improvement
• 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
• Mentor engineers and help raise the bar across the team
• Demonstrated 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 For:

• 7+ years of backend or full-stack engineering experience, with meaningful time spent on payments, fintech, or money-movement systems
• 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.

Preferred Knowledge and Skills:

• 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.
• 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
• A clear record of getting products to market and prioritizing solutions and improvements based on stakeholder/customer feedback.

Nice to Have

• 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.

What Makes Working at Sezzle Awesome?

At Sezzle, we are more than just brilliant engineers, passionate data enthusiasts, out-of-the-box thinkers, and determined innovators; we are skilled musicians, yogis, cyclists, chefs, golfers, dog-lovers, and rock-climbers. We believe in surrounding ourselves with not only the best and the brightest individuals, but those that are unique and purpose-driven in all that they do. 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.

#Li-remote #Full-time