Senior Software Engineer · Oxford, UK

Haffi
Mazhar

I build low-latency, real-time systems. Right now that means teleoperation for autonomous vehicles at Oxa, streaming live video and control across fibre, 4G and Starlink.

View experience Resume

01 / Summary

Engineering for the last few milliseconds

Haffi Mazhar

Haffi Mazhar

Senior Software Engineer

Oxford, UK

Software engineer with 7+ years in backend development and real-time systems. I build FastAPI services and cloud infrastructure, tune Python services for performance, and test reliability at very high scale. Currently building low-latency teleoperation for autonomous vehicles at Oxa, and previously founding engineer on a consumer sports platform.

  • MSc Engineering, Technology and Business Management

    University of Leeds · 2018 – 2019

  • BEng Mechanical Engineering

    University of Nottingham · 2015 – 2018

02 / Impact

Key numbers

  • <200ms

    Live video latency

    Fleet-wide AV teleoperation over an optimised WebRTC pipeline.

  • <50ms

    Control messaging

    Bidirectional operator-to-vehicle messaging across fibre, 4G and Starlink.

  • 15M

    Concurrent users

    Performance and chaos testing for Sky's identity platform.

  • 10,000s

    Vouchers issued

    ASOS digital loyalty launch at Bink.

03 / Experience

Where I've shipped

  1. Oxa

    Senior Software Engineer, Autonomous Vehicles Remote Assist

    Sep 2024 – Present/Oxford, UK

    • Architected and built multi-client video streaming and remote control with WebRTC, enabling fleet-wide teleoperation across regions and AV platforms.
    • Achieved sub-200ms video latency and under 50ms bidirectional messaging latency using WebRTC (H.264/VP9 over UDP) across fibre, 4G and Starlink.
    • Deployed a real-time WebSocket service on GCP Cloud Run with FastAPI, Redis and Cloud SQL, scaling to concurrent vehicle/operator sessions with strong connection reliability.
    • Provisioned GCP Cloud SQL, Redis and Pub/Sub infrastructure with Terraform.
    • WebRTC
    • FastAPI
    • Redis
    • GCP
    • Terraform

  2. EggMonkey

    Founding Engineer (part-time venture)

    2024 – 2026/Boston, UK

    • Took a consumer sports platform from concept to production, generating £20k total revenue and £1.3k MRR, owning product discovery, architecture and delivery.
    • Partnered directly with the CEO to turn customer needs into scoped features and a pragmatic roadmap; recruited and managed UI/UX and customer-service hires.
    • Built the full-stack platform from scratch with Next.js, React, TypeScript, Node.js and PostgreSQL: auth, onboarding, player profiles, fixture booking and matchmaking, subscriptions, football video highlights and an operations admin portal.
    • Architected the cloud infrastructure, including Stripe payments and subscriptions, Mux video streaming, S3, SES notifications, Vercel hosting and DNS.
    • Next.js
    • TypeScript
    • PostgreSQL
    • Stripe
    • Mux

  3. Move.ai

    Backend Python Developer

    Oct 2023 – Aug 2024/London, UK

    • Shipped multi-tenant SaaS services using FastAPI on AWS Lambda, integrating DynamoDB, Stripe and Auth0.
    • Added Datadog performance dashboards and standardised CI/CD in GitHub Actions for more reliable, visible deploys.
    • FastAPI
    • AWS Lambda
    • DynamoDB
    • Stripe
    • Datadog

  4. Bink

    Backend Python Developer

    Jan 2022 – Oct 2023/Ascot, UK

    • Delivered retailer APIs with FastAPI/Django, Postgres, Redis and RabbitMQ for digital loyalty; supported the ASOS launch issuing tens of thousands of vouchers.
    • Django
    • FastAPI
    • Postgres
    • RabbitMQ
    • Redis

  5. Sky

    Software Engineer, Performance

    Nov 2019 – Dec 2021/Leeds, UK

    • Optimised Sky Identity to handle spikes of ~10 million concurrent users through scaling, resource tuning and load balancing.
    • Introduced chaos and failover testing for APIs serving ~15 million concurrent users.
    • Load testing
    • Chaos testing
    • Kubernetes

04 / Toolkit

Skills

Languages

  • Python
  • Go
  • C++
  • TypeScript

Real-time systems

  • WebRTC
  • WebSockets
  • gRPC
  • FastAPI

Reliability & performance

  • Latency reduction
  • Load testing
  • Chaos/failover testing
  • Horizontal scaling

Cloud & infrastructure

  • GCP
  • AWS Lambda
  • Kubernetes
  • Terraform
  • IAM
  • PostgreSQL
  • DynamoDB
  • Redis
  • RabbitMQ
  • Grafana
  • Prometheus

05 / Side projects

Things I've built

All projects

06 / Learning logs

Recent writing

All posts
  1. 01Threads and ProcessesGeneral1 min read
  2. 02Cap TheoremGeneral4 min read
  3. 03Data Structures - TreesGeneral3 min read
  4. 04Load BalancingNetworking3 min read

07 / Contact

Open a connection.

Real-time systems, reliability at scale, or just a good networking rabbit hole: my inbox is open.