Abdul Rafay Zahid

Experience

Where the work happened

Three years across a zero-trust network platform, an email platform built solo, and the tooling under AI products.

Reverse chronological, YYYY-MM.

2026-07 to nowopen source

Author and maintainer

Colloid Swarm
  • Portable multi-agent development scaffold, adopted as the company-wide engineering harness for roughly 50 engineers
  • Seven delegating personas (explorer, implementer, reviewer, QA verifier, researcher, mechanic, learning reporter) route work across three cost and capability tiers, holding planning and architecture at the top tier
  • Hostile review runs as an independent gate rather than self-assessment by the implementer

stack: Python, Bash, Claude Code, Codex, MCP

2025-05 to nowfull-timelahore

Software Engineer

Softaims

  • Architected and delivered an enterprise email infrastructure platform, solo, that scaled to 200K+ emails/day across 1,000+ domains: a multi-channel campaign engine orchestrating KumoMTA and Amazon SES edge nodes with A/B testing, threaded follow-ups, and real-time delivery state tracking
  • Automated the DNS lifecycle (SPF/DMARC/DKIM), deployed edge agent daemons across multi-region VPS nodes, and built deliverability automation: graduated warmup scheduling with Redis-locked cycles, MXToolbox blacklist monitoring, and bi-directional Salesforce sync
  • Built the voice onboarding module of Meridian, a service-business profitability platform: an ElevenLabs Conversational AI agent runs a spoken discovery interview while the backend keeps conversation state in a slot-walk, so the whole interview script replays offline without a live call

stack: Python, FastAPI, TypeScript, NextJS, PostgreSQL, Redis, Celery, KumoMTA, AWS, Salesforce, ElevenLabs, LangChain, OpenAI, Playwright, Pandas, NumPy

2024-06 to 2025-04full-timelahore

Associate Software Engineer

Ebryx Pvt Ltd
  • Scaled a C++ gateway from 200 to 5,000 concurrent TLS WebSocket clients by replacing blocking polling with non-blocking polling, pooling connections, batching Arena requests, and initializing Arena memory up front
  • Stress-tested the gateway under extreme load and fixed the failure paths normal traffic never exposed, including a log-rotation race that removed a file between check and read and crashed a worker thread
  • Engineered an auto-update migration system for the gateway that carried it across significantly different software versions during the move to a multi-tenancy architecture

stack: C++, Python, MySQL, Kafka, Cython, Linux, Docker

2023-11 to 2024-04part-timeremote

Software Engineer

Active Takeoff

  • Wrote custom optical character recognition software to parse tabular image data across hundreds of documents and loaded it into MySQL for enriched modeling
  • Indexed customer data in Elasticsearch for sub-millisecond search, optimized the data representation for retrieval with image querying, and integrated a dynamic search function into the existing frontend

stack: Python, MySQL, ElasticSearch

2023-07 to 2023-09internshiplahore

App Development Intern

Systems Limited

  • Designed and developed API functionality between a PostgreSQL database and an e-commerce platform, with secure user authentication through Azure AD
  • Containerized and orchestrated the platform to cloud environments with Docker and Kubernetes IaC as part of the Azure DevOps pipeline

stack: PostgreSQL, Docker, Azure

2022-07 to 2022-08internshiplahore

Software Intern

Punjab Information Technology Board

  • Collaborated on the .NET backend for a government portal, with Bcrypt encryption, JWT authentication, and automated API tests in Postman
  • Researched and optimized an architecture to streamline the GitHub Actions CI/CD pipeline to the client's in-house data center

stack: PostgreSQL, Postman