Senior Payments Engineer – Acquiring, Payment Processing

Sezzle

. Design and build backend services in Golang integrating with payment processors, gateways, and card networks .

Posted 11/3/2026full-timeRemoteSenior💰 $5,000 - $9,500 per monthWebsite

Core Competencies

Role fit

Core Competencies

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Proficient in designing and building backend services using Golang, with extensive experience in payment processing, integration with payment gateways, and ensuring compliance with PCI DSS standards. Demonstrates strong capabilities in mentoring teams, delivering scalable solutions, and utilizing observability tools for performance monitoring.

Highest-signal resume keywords

Golang Backend DevelopmentPayment Processor IntegrationPCI DSS ComplianceDistributed Architecture ExperienceObservability Tools Proficiency

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Backend EngineeringREST API DevelopmentSQL-Based RDBMSTokenizationIdempotencyReconciliationChargeback HandlingCloud-Based ArchitectureCI/CD PipelinesMicroservice Architecture

Soft Skills

MentoringTeam LeadershipCollaboration

Tools & Technologies

Claude LLMKafkaSQSRabbitMQPrometheusNew RelicDatadogKubernetesAWS

Certifications & Qualifications

Bachelor's Degree in Computer ScienceBachelor's Degree in Engineering

Industry Keywords

FintechPaymentsMoney-Movement Systems

Tech Stack

Tools & technologies

AWSCloudKafkaKubernetesPrometheusPythonRabbitMQRDBMSSQLGo

About the role

Key responsibilities & impact

Design and build backend services in Golang integrating with payment processors, gateways, and card networks
Own authorization, capture, settlement, refunds, reconciliation, and chargeback/dispute handling flows
Build idempotent, fault-tolerant, auditable transaction processing in a distributed architecture
Operate within PCI DSS scope, including tokenization, network tokens, secure payment-data handling, and 3DS/SCA flows
Instrument and monitor authorization rates, decline rates, processor performance, latency, and settlement accuracy
Use Claude or equivalent LLM tools for design, coding, research, testing, and documentation within security policies
Mentor engineers, unblock peers, and occasionally lead small project teams
Partner with Product, Risk, Compliance, Support, and engineering teams to deliver scalable payment solutions

Requirements

What you’ll need

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
Familiarity with authorization vs. settlement, tokenization, idempotency, reconciliation, and chargebacks/disputes
Experience in 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 enhance productivity, research, and communication
Bachelor's degree in Computer Science, Engineering, or a related field
Experience with SQL-based RDBMS through an ORM
Experience with observability platforms such as Prometheus, New Relic, or Datadog
DevOps experience with CI/CD pipelines
Familiarity with containerized microservice architecture deployed with Kubernetes on AWS
Demonstrated history of delivering commercial APIs and web applications