RemoteLeaf Logo
Log in Sign up

Senior Payments Engineer — Acquiring & Payment Processing

2 months, 1 week 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 95

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

Similar Roles

Margo Bank

Senior C# / .NET Developer

Margo Bank Professional Services

Senior developer role in a six-person technology unit supporting a global Retail Media company, focused on designing and building a Core User Platform and partner APIs from the ground up.

Poland Contract Senior Backend Engineer
$61k-$72k
C# .NET
9 hours, 14 minutes ago
Megaport

Senior Backend Engineer

Megaport 251-1K Diversified Telecommunication Services

Megaport is hiring a Senior Software Engineer to evolve its global Network as a Service platform by developing backend services, modernizing core systems, and guiding technical improvements.

Australia Full-time Senior Backend Engineer
CI/CD Hibernate Java Kotlin REST API SQL
9 hours, 14 minutes ago
MUTT DATA

Java Back End Developer Senior

MUTT DATA 51-250 Internet Software & Services

Mutt Data is seeking a Senior Java Backend Developer to build scalable data, reporting, and analytics systems for machine learning and data-driven client solutions in a remote startup environment.

Argentina Full-time Senior Backend Engineer
Apache Airflow AWS Azure CI/CD Databricks dbt Deep Learning Docker GCP Generative AI Git GraphQL Java Kubernetes Machine Learning Python React Terraform TypeScript
9 hours, 14 minutes ago
Lingaro

Backend Developer - Contract

Lingaro 5K-10K IT Services

Backend Developer for a four-month remote contract in India, responsible for building and operating scalable Python services, APIs, and cloud-based microservices.

India Contract Senior Backend Engineer
Agile Azure CI/CD Databricks Django Docker FastAPI Git Go Kafka Kubernetes Microservices Python React REST API Scrum SQL Terraform
9 hours, 14 minutes ago

You're on a roll! Sign up now to keep applying.

Sign Up

Already have an account? Log in

Used by 14,729+ remote workers