Senior Backend Engineer - Scale APIs & Integrations

PackageX, Inc.; Islamabad; On-site; PKR 3,000,000 - 5,500,000; Full time

Job summary

PackageX, Inc. is seeking a Senior Backend Engineer (Full Stack) to design, build, and scale services and APIs that power our physical logistics platform. You’ll integrate with ERP, WMS, and TMS systems, and own production services from schema to screen.

The role blends backend rigor with web UI work, requiring strong cross‑team collaboration. You’ll contribute to data models, event processing, and offline syncing while delivering reliable, scalable software across React and Svelte UIs.

Qualifications

• 5+ years building and running production backend services.
• Strong in Node.js/TypeScript, Python, or Go.
• Relational DB design with MySQL and PostgreSQL.
• Experience designing APIs and integrating with enterprise systems.
• Familiar with queues and async processing (SQS, RabbitMQ, Kafka).
• Experience deploying on AWS or GCP with Docker and CI/CD.

Responsibilities

• Design and build backend services and APIs powering the PackageX platform, mobile app, and web console.
• Model data for complex, configurable workflows and ensure consistency as volume grows.
• Build and maintain integrations with ERP, WMS, TMS, third‑party APIs, webhooks, and data exports.
• Write event-driven and async processing with queues, workers, and scheduled jobs.
• Build the backend behind Vision AI features, image ingestion, processing pipelines, and result storage.
• Handle offline sync and conflict resolution for data coming in from mobile devices on the floor.
• Build web features end to end, from API to UI: dashboards, configuration tools, admin, and reporting.
• Own your services in production: deploys, monitoring, logging, alerting, on-call, and post-incident fixes.
• Keep the platform secure: access control and multi-tenant data isolation.
• Write tests, review code, and keep design docs and API documentation in a state others can build on.
• Join implementation and customer conversations when an integration or data issue needs an engineer in the room.

Skills

Backend engineering

5+ years

Node.js/TypeScript

Python

Go

APIs

Queues & async processing

AWS or GCP

Docker

CI/CD

Tools

MySQL

PostgreSQL

SQS

RabbitMQ

Kafka

Docker

CI/CD

Job description

PackageX, Inc. is seeking a Senior Backend Engineer (Full Stack) to design, build, and scale services and APIs that power our physical logistics platform. You’ll integrate with ERP, WMS, and TMS systems, and own production services from schema to screen.

The role blends backend rigor with web UI work, requiring strong cross‑team collaboration. You’ll contribute to data models, event processing, and offline syncing while delivering reliable, scalable software across React and Svelte UIs.