Senior Payments Engineer — Acquiring & Payment Processing

Sezzle; Brasil; Presencial; BRL 287 777 - 546 776; Tempo integral

Resumo da oferta

Sezzle is hiring a Senior Payments Engineer to own and scale the payments stack, integrating with processors and gateways, moving funds, and ensuring accuracy and resilience. You will collaborate with Product, Risk, Compliance and other engineers to deliver scalable solutions for authorization, settlement, reconciliation, and disputes, mentoring teammates and leading small projects.

A background in payments, Go (or Python), PCI DSS awareness, and experience with AI tooling (Claude) are highly

Qualificações

• 8+ years in backend or fintech payments systems.
• Strong Go or Python REST API experience.
• Experience with payment processors, gateways, or acquiring systems.
• Familiar with tokenization, idempotency, settlement, and dispute handling.

Responsabilidades

• Design and build backend services in Golang integrating with processors and gateways.
• Own end-to-end money-movement flows: authorization, settlement, refunds.
• Implement idempotent, fault-tolerant transaction processing in a distributed system.
• Operate within PCI DSS scope including tokenization and 3DS/SCA flows.
• Monitor payment health and drive continuous improvement.

Conhecimentos

Go

Python

REST APIs

Payments

Kafka

SQS

RabbitMQ

AWS

Kubernetes

Claude

Formação académica

Bachelor's degree in CS/Engineering

Ferramentas

MySQL

PostgreSQL

Elasticsearch

Prometheus

Datadog

New Relic

Kubernetes

AWS

Git

GitLab

Descrição da oferta de emprego

Job Overview

Salary range for this role is $5,000 - $9,500 per month (gross in USD).

About Sezzle: 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.

Compensation

For this senior development role, with 8+ years of experience, the compensation range is $5,000 - $9,500 USD per month.

Role Summary

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), 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, 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 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.

About You

• You 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 things.
• You 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.

Sezzle’s Technology Stack

• 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
• Testing: Developer‑driven, focus on automated unit, integration, and end‑to‑end tests
• Sezzle is focused on using open source, and we build what we can before buying!

What Makes Working at Sezzle Awesome?

At Sezzle, we are more than just brilliant engineers; we’re passionate data enthusiasts, out‑of‑the‑box thinkers, and determined innovators. We also value a diverse community of skills and interests—from musicians and yogis to cyclists and chefs. We believe in surrounding ourselves with the best and brightest individuals, fostering a culture that goes beyond typical startup perks and instead reflects the lived experience and dedication of every employee.