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Usman Zahoor

@usman-ali

Senior Backend Engineer with 4+ years building AWS serverless distributed systems and automation pipelines in Node.js/NestJS.

Pakistan

Message

What I'm looking for

I’m looking for a team where I can design clean, scalable backend services—especially AWS serverless and distributed systems—while owning real production impact, performance, and reliable integrations with strong engineering standards.

Senior Backend Engineer with 4 years building multi-tenant SaaS platforms, distributed systems, and enterprise APIs on Node.js, NestJS, TypeScript, and AWS.

At Paismo, I designed and shipped Nexus API, a public-facing enterprise workforce platform with multi-tenant isolation, Auth0 RBAC and ABAC, and Lambda microservices deployed across two AWS regions. The API serves payroll, HRIS, time and attendance, leave, and document generation endpoints with rate limiting at 1,000 requests per minute. Live at nexus-api.paismo.com/docs.

Before Paismo, I led backend systems at Qbatch, including Pass Gallery Migration, a distributed AWS pipeline processing 500,000 images per client per month, cutting migration time from 5 days to under 24 hours using ECS Fargate, SQS, and Playwright automation. I've built production systems across HRMS, e-commerce, and large-scale data migration.

I care about correctness, observability, and backend code that the next engineer can actually maintain.

Specialties: Backend Development, Distributed Systems, Multi-tenant SaaS, Node.js, NestJS, MongoDB, PostgreSQL, API Integration, AWS Lambda, ECS, SQS, EventBridge, Auth0, OpenTelemetry, Datadog.

Portfolio with architecture case studies: usman-ali.dev

Experience

Work history, roles, and key accomplishments

Current

Backend Engineer III

Current

Paismo

May 2025 - Present (1 year 1 month)

Built a Reporting Engine from scratch enabling admins to generate monthly employee reports (payroll history, attendance, timesheets, leave, deductions, and allowances). Architected the Employee Lifecycle module with an immutable audit trail and developed Synapse integration for bi-directional data sync with QuickBooks/Xero via Unified.to.

NestJS PostgreSQL Microservices OAuth Unified.To API Security

Software Engineer

Qbatch

Apr 2023 - May 2025 (2 years 1 month)

Designed and led a distributed AWS migration system using ECS/SQS/Lambda that reduced image migration time from 3–5 days to under 24 hours (85% improvement). Built high-throughput, reliable pipelines (30 parallel workers) achieving 80–90% higher throughput and 99.9% automation accuracy for 500k images per client monthly, cutting operational costs by 40%.

AWS Lambda AWS ECS Amazon SQS MongoDB Datadog Distributed Queue Pipelines Power BI