Sr Backend Engineer

Milleniance Softnet; United States; Hybrid; USD 120,000 - 160,000; Full time

Job summary

Milleniance Softnet seeks a senior backend engineer to own integration architecture for 2-3 enterprise accounts, focusing on BFSI and healthcare integrations. You will design APIs and backend services in Node.js and Java, ensuring uptime and reliability, while leading architecture reviews and coordinating with client engineering teams.

You’ll participate in on-call rotations and document architectural tradeoffs to build resilient platforms that outlast individual engineers.

Qualifications

• 5+ years backend engineering and production system design.
• Experience designing APIs at production scale with uptime accountability.
• Comfort communicating architecture decisions to client teams.

Responsibilities

• Own integration architecture for 2-3 enterprise accounts.
• Design and build APIs and backend services meeting uptime SLAs.
• Lead architecture and code reviews for engineers on your accounts.
• Work with client engineering teams to integrate with core banking, loan management or hospital information systems.
• Participate in rotating on-call schedule for managed-uptime accounts.
• Document architecture decisions and tradeoffs to ensure system longevity.

Skills

Backend engineering

API design

Architecture leadership

System design

Cloud platforms

Relational databases

PostgreSQL

Redis caching

Client communication

Tools

Node.js

Java

AWS

Job description

This is an architecture-ownership role, not a ticket-queue role. Youll be the named senior engineer for two to three client accounts - typically a bank or NBFCs core lending platform, or a hospital chains patient-facing systems - responsible for the integration architecture, the uptime SLA, and the technical relationship with the clients own engineering team.

Youll work closely with our technology practice lead and with the client-facing teams from our BFSI and healthcare industry practices, which means your architecture decisions get real regulatory and compliance context, not just a feature spec.

What youll do

• Own the integration architecture for 2-3 enterprise client accounts, primarily in BFSI and healthcare.
• Design and build APIs and backend services in Node.js and Java, meeting contracted uptime SLAs.
• Lead architecture and code review for the engineers working on your accounts.
• Work directly with client engineering teams to integrate with core banking, loan management or hospital information systems.
• Participate in a rotating on-call schedule for managed-uptime accounts you own.
• Document architecture decisions and tradeoffs so the system survives beyond any one engineer.

What were looking for

• 5+ years of backend engineering experience, including production system design.
• Strong experience with Node.js or Java, and comfort working across both.
• Experience designing and operating APIs at production scale, with real uptime accountability.
• Working knowledge of relational databases (PostgreSQL) and caching layers (Redis).
• Experience with AWS or a comparable cloud platform.
• Comfortable communicating architecture decisions directly to a clients engineering team.

Nice to have, not required

• Experience integrating with core banking, loan management or hospital information systems.
• Exposure to ISO 27001 or PCI-DSS-aligned engineering practices.
• Experience mentoring junior engineers or leading a small team.