Senior Backend Engineer

Job Description

Senior Backend Engineer – Payments Platform
Location: Austin, TX (On-site)
Job Type: Full-Time
Experience Required: 6–7 Years
Work Authorization: Must be authorized to work in the United States without sponsorship

About the Company
We are building a modern, API-first fintech platform focused on payment processing infrastructure and high-volume ACH reconciliation within the highly regulated U.S. financial services ecosystem. As an ambitious, AI-native startup, we are looking for engineers who thrive in fast-paced environments and take complete ownership of their work.

Role Overview
We are seeking a Senior Backend Engineer with strong expertise in backend development, payment workflows, and event-driven architecture. This role will focus on building and maintaining scalable backend systems that power our payments platform, ensuring reliability, performance, and operational excellence.
This is a hands-on role requiring ownership from design through production deployment. The ideal candidate is comfortable working in a high-intensity startup environment, solving complex engineering challenges, and collaborating cross-functionally.

Key Responsibilities
Design, develop, and maintain production-grade Node.js backend services and REST APIs
Build and manage end-to-end ACH payment workflows, including debits, credits, retries, failure handling, ledgering, and reconciliation
Develop event-driven microservices using AWS services such as SQS, Lambda, and API Gateway
Design and optimize PostgreSQL database schemas for high-integrity financial workflows
Implement and maintain CI/CD pipelines and automated deployment workflows
Ensure system reliability, observability, scalability, and performance optimization
Create and maintain technical documentation, deployment runbooks, and architecture notes
Build internal tools and dashboards using React when required
Troubleshoot production issues, payment failures, and asynchronous workflow bottlenecks
Collaborate with Product, QA, DevOps, and business stakeholders
Support customer integrations and resolve live workflow issues when needed

Required Skills & Qualifications
6–7 years of software engineering experience with strong backend development expertise
Strong hands-on experience with Node.js and REST API development
Solid experience with PostgreSQL, including schema design, query optimization, and data integrity
Strong AWS experience with:Lambda
SQS
RDS
API Gateway
Secrets Manager
Experience with event-driven architecture, queues, webhooks, retries, and failure handling
Hands-on experience with CI/CD pipelines and deployment automation
Experience with OpenAPI / Swagger documentation
Strong understanding of API scalability, observability, and backend reliability
Experience working in Agile development environments
Strong cross-functional communication and ownership mindset

Preferred / Good-to-Have Skills
Experience with ACH payment systems, NACHA operating rules, and payment reconciliation
Experience in fintech or regulated financial environments
Knowledge of SOC 2 compliance, audit logging, and idempotency
Experience with NestJS
Exposure to Java / Spring Boot
Experience using AI-assisted development tools such as Claude, GitHub Copilot, or Cursor
Team leadership or mentoring experience

Ideal Candidate Profile
Strong backend engineer with experience in payments or fintech platforms
Comfortable owning systems end-to-end, from architecture to production support
Problem solver with strong debugging and incident management skills
Thrives in startup environments with fast execution and high accountability

Node.js,REST APIs,Postgre SQL