Back End Developer
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Backend Engineer Piston Technologies, Inc. — On-site, San Francisco Bay Area (Cupertino, CA) About PistonPiston Technologies is building a closed-loop payment network for the U.S. trucking industry, changing how fleets pay for and manage fuel. Our flagship product, PistonPay, is a cardless fuel payment platform that gives fleets real-time controls, dynamic underwriting, and full visibility at the pump. We integrate directly with fuel retailers' point-of-sale systems to move high volumes of real-time transactions securely and reliably.
The Role:
We're looking for an experienced Backend Engineer to design, build, and own the systems behind fuel payments, fleet transactions, loyalty programs, mobile payments, and fuel retail integrations — work that sits squarely at the intersection of B2B and B2C.This role is heavily backend-focused and demands strong experience with Node.js, Express.js, PostgreSQL, distributed systems, and XML-based integrations. The ideal candidate is comfortable owning architecture, leading technical initiatives, and delivering highly scalable production systems. This is a full-time, on-site role in the San Francisco Bay Area.
Responsibilities:
- Design, develop, and maintain backend services using Node.js and Express.jsArchitect and support microservice-based applications and RESTful APIsDesign and optimize PostgreSQL databases for high-volume transactional workloads
- Build and maintain XML-based integrations with third-party platforms and partners
- Develop and support cloud-native applications running in AWSUse Docker, Kubernetes, and CI/CD pipelines to deliver reliable production services
- Uphold the security, reliability, and compliance standards expected of a payments platform (e.g., PCI DSS)
- Collaborate with Product, Operations, and Engineering to deliver scalable solutions
- Participate in architectural planning, technical design reviews, and engineering best practices
Required Qualifications:
5+ years of software engineering experience
Strong experience with:
- Node.jsExpress.jsPostgreSQLRESTful API design
- Microservice architectures
- RedisXML-based integrations
- Experience designing and operating highly available, transaction-oriented systems
- Experience with AWSExperience with Docker, Kubernetes, and CI/CD processes
- Strong understanding of distributed systems, scalability, performance optimization, and database architecture
Preferred Qualifications: Experience with one or more of the following:
- Conexxus standards and XML messaging specifications
- Conexxus Mobile Payments, EPS, or Site Systems implementations
- Verifone Commander and Verifone forecourt integrations
- Gilbarco Passport and forecourt controller integrationsNACS standards and fuel retail operational workflows
- Fuel payment processing, loyalty platforms, fleet card systems, or forecourt technologies
- Payment authorization, settlement, and reconciliation systems
Ideal Candidate:
You're a highly experienced backend engineer who enjoys solving complex integration challenges across B2B and B2C architectures. You have a strong foundation in modern backend development and understand how large-scale transactional systems behave in production. Experience in fuel retail, payments, or convenience retail technology is highly valued.