Muhammad Haseeb

Where I've worked

The day job is still where a lot of the hard systems get built. This is where I've done that work.

Xref — Principal Engineer

2025 – Present · Sydney

I lead backend architecture for a global HR-tech platform, from the infrastructure up through the standards the team ships with.

Highlights

  • Lead backend architecture across the platform
  • Designed AWS infrastructure — Lambda, API Gateway, RDS, SQS, SNS
  • Mentor engineers and help shape how the team works

Xref — Senior Engineer

2024 – 2025 · Sydney

I worked on the Django core and internal tooling so the product was easier to maintain and safer to change.

Highlights

  • Upgraded Django core for maintainability and security
  • Built internal Angular tooling and a reusable UI library

Xref — Full Stack Engineer

2022 – 2024 · Sydney

I shipped the APIs and integrations the product runs on.

Highlights

  • REST APIs, management commands, and third-party integrations

Squibler — Technical Lead

2021 – 2022 · Remote

I led a remote team of 8 through major launches, and shortened how long it took us to ship.

Highlights

  • Managed a remote team of 8 through major launches
  • Reduced GCP infrastructure costs by 10%
  • CI/CD with GitHub Actions — deploys from days to under an hour

Arbisoft — Senior Engineer

2021 · Lahore

I worked on a large podcast data pipeline and the recommendation path, then moved the warehouse somewhere cheaper to run.

Highlights

  • Scrapy pipeline processing 4.5M+ podcast records
  • AWS Kinesis for realtime tracking — recommendations +60%
  • Warehouse migration from Redshift to Snowflake, saving $500/mo

Arbisoft — Engineer

2018 – 2021 · Lahore

I built Python and Django backends that grew past 500k users, and deployed learning platforms for a lot of clients.

Highlights

  • Scaled Python/Django backends past 500k users
  • OpenEdX deployments — 20+ clients, 10k+ learners

I work mostly with

Python · AWS · Django · Postgres · TypeScript · React · LLMs

And a lot of other things when the problem requires it.

The longer list

  • Languages: Python · TypeScript · JavaScript · SQL · C#
  • Backend: Django · FastAPI · DRF · REST · Microservices · ETL
  • Cloud: AWS · GCP · Netlify · Lambda · SQS/SNS · CI/CD
  • Data: Postgres · Supabase · Snowflake · Redshift · Kinesis · Scrapy
  • Frontend: React · Next.js · Angular · Design systems
  • Agentic: Claude Code · Cursor · Agentic workflows · LLM integrations
  • Practice: System design · Team lead · Mentorship · Architecture