Senior Python Developer w/ Payments, Credit Card or Debit Card

Intersources Inc.

Jersey City, NJ, United States

3 months ago

Apply on intersourcesinc.com

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Role details

Contract type

Permanent contract

Employment type

Full-time (> 32 hours)

Experience level

Expert

Compensation

$26,000.0

Working hours

Regular working hours

Job source

intersourcesinc.com

Tech stack

Application Programming Interfaces (APIs) Amazon Web Services Applications Architecture Microsoft Azure Cloud Engineering Continuous Integration Software Design Patterns Distributed Systems Payment Systems Google Wallet Python (Programming Language) Service-Oriented Architecture

+15 more

Software Engineering SQLAlchemy Tokenization Code Structure Fastapi Event Driven Architecture Pytest Kubernetes Apache Kafka Domain Driven Development ISO 8583 Api Design Api Management Docker Microservices

Job description

Architect and develop Python microservices and APIs integrating with Visa, Mastercard, and debit networks (Interlink, Pulse, NYCE, STAR)
Own application design across core domains: authorization, clearing, settlement, dispute management, and fraud
Define data models, event schemas, and API contracts across card processing platforms
Lead architecture reviews and produce ADRs for new capabilities and modernization efforts
Build internal frameworks, libraries, and SDKs used across card technology teams
Establish Python engineering standards - code structure, testing, CI/CD, observability, and API design
Drive decomposition of legacy and mainframe-adjacent systems into clean service-oriented architectures
Mentor staff and senior engineers on design patterns and software craftsmanship

Requirements

10+ years of software engineering; 5+ years at principal-level or above
Expert Python: FastAPI, asyncio, Pydantic, SQLAlchemy, pytest
Strong application architecture background - microservices, event-driven design, DDD, clean/hexagonal architecture
Solid understanding of card network processing: authorization flows, ISO 8583, clearing, settlement, chargebacks
Experience building high-throughput, low-latency distributed systems in production
Proficiency with Kafka or equivalent async messaging patterns
Strong written and verbal communication; able to align technical and business stakeholders, * Card network certification experience (Visa, Mastercard, PIN debit)
Familiarity with tokenization (EMVCo), 3-D Secure, or digital wallet integrations
Cloud development on AWS, GCP, or Azure with Kubernetes/Docker
Background modernizing legacy payment platforms
Experience authoring enterprise-level engineering RFCs or technical standards