Demo

Senior Software Engineer (Backend)

DeWinter Group
Napa, CA Contractor
POSTED ON 4/2/2026
AVAILABLE BEFORE 4/30/2026
Title: Senior Software Engineer (Backend)

Job Type: Contract

Contract Length: 4 Months

Pay Range: $100/hr – $125/hr

Start Date: ASAP

Location: Hybrid - San Jose, CA

About The Opportunity

Our client, a leader in FinTech and cloud-based payment solutions, is looking for a skilled Senior Software Engineer (Backend) to join their team for a 4-month engagement. This project involves enhancing capabilities for card issuing and processing within Accounts Payables and Accounts Receivables platforms to grow and scale card payments. This is a high-impact role that requires a self-motivated professional who can hit the ground running and deliver results quickly.

Key Responsibilities & Deliverables

This role is focused on the successful completion of specific tasks and deliverables. Your responsibilities will include:

  • Designing, building, and supporting highly reliable, low-latency payment systems and REST APIs.
  • Developing robust integrations with third-party payment providers leveraging messaging queues and events.
  • Implementing secure, compliant, and fraud-resistant payment solutions, with a strong focus on security and encryption.
  • Automating deployment, testing, and infrastructure management using Infrastructure-as-Code (IaC) tools and CI/CD pipelines.
  • Diagnosing and troubleshooting issues quickly in live production environments, taking full ownership of critical systems.

Required Skills & Experience:

We are looking for someone with a proven track record of successful contract engagements. The ideal candidate will have:

  • 5 years of experience designing, developing, and operating distributed systems and microservices.
  • Deep expertise in Java, Spring Boot, and AWS cloud services (EC2, RDS, Lambda, API Gateway), as well as expertise in SQL/NoSQL databases. This isn't a learning role—you need to be a subject matter expert.
  • Demonstrated ability to work autonomously and manage your own time effectively to meet project goals.
  • Experience with scalable architectures leveraging containers (Kubernetes), messaging, event streaming, and CI/CD pipelines.
  • Strong communication skills to provide clear and concise status updates to the project team, and the ability to mentor junior engineers.

W2 only (No C2C or 1099 contractors)

Salary : $125

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