Senior Software Engineer (Backend)

Senior Software Engineer (Backend)

Contract Type:

Contract

Location:

Napa - CA

Industry:

Information Technology

Contact Name:

Bailey Vela

Contact Email:

bvela@dewintergroup.com

Contact Phone:

(669) 877-1746

Date Published:

03-31-2026

Salary:

$100.00 - $125.00 Per Hour

Job ID:

38843

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) #LI-BV1

DeWinter Group and Maris Consulting  is an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, age, sex, national origin, disability status, genetics, protected veteran status, sexual orientation, gender identity or expression, or any other characteristic protected by federal, state or local laws. We post pay scales which are based on our client pay ranges. DeWinter, Maris, and our clients have the right to modify the requirements of the role which can impact the pay ranges posted.

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