Backend & infrastructure engineer. I built and sold a full-stack networking-infrastructure SaaS — the company was acquired at a $1.6M valuation in 2026. I was the sole engineer: the customer platform, the billing, the autoscaling relay tier, and the network behind it. I build the parts that have to stay up.

Most of my strongest engineering is proprietary — the summaries below describe it in neutral terms. Where I could generalize a piece and strip anything product-specific, I open-sourced it. The result is nine focused, independently-tested libraries and services on this account, linked from the sections below.

Networking-infrastructure SaaS (the acquired company) A full-stack self-serve platform — Node/Express, Discord OAuth, a public REST API, and a companion Discord bot — routing customer traffic across a ~29-million-IP residential network. Sole engineer, end to end.

Usage-metered billing Dual payment rails — Stripe (cards) and crypto (Solana) — with GB-based entitlement and automated revenue reconciliation.

EC2 fleet autoscaler — relay-autoscaler (open-source, sanitized) A control loop that SSH-health-polls a fleet of gateway nodes, scores load over rolling windows, and scales instances up/down with hysteresis and cooldowns while reconciling Cloudflare DNS — with graceful draining and crash recovery. The generalized, cloud-agnostic cut (pluggable Compute/DNS/HealthProbe, EC2 + Cloudflare adapters) is public and test-covered.

AWS release infrastructure — aws-update-channel (open-source, sanitized) A CDK-provisioned update channel — S3 + Lambda + API Gateway — with per-product bearer tokens, presigned URLs, and IAM-isolated stacks. Served 4 products across 10 surfaces. A generalized, product-agnostic cut is public and test-covered.

Self-hosted mail server — a suite of open-source libraries extracted from it ~59k lines of production Go across 37 packages (~1,470 tests). IMAPS on :993 (TLS-only, argon2id), Microsoft Graph sync, Postgres full-text search, and a React UI, on AWS under systemd. I generalized and open-sourced a product-agnostic mail toolkit out of it:

• imap-server — a from-scratch IMAP4rev1 server (pluggable backend/auth/IDLE)
• imap-poller — IMAP IDLE + incremental UID-sync client
• smtp-inbound — inbound SMTP server · smtp-mailer — outbound sender
• msgraph-mail — Microsoft Graph mail client · graph-webhook — Graph change-notification receiver
• credvault — at-rest credential crypto (argon2id + AES-GCM + context-bound AAD)

Contract search platform — contract-search-platform A FastAPI backend for contract/COI document search: PostgreSQL full-text search, a Celery OCR pipeline, JWT + role-based access, and Docker Compose. Public and self-contained.

Reverse engineering Statically unpacked a deprecated PyArmor-armored binary (AES-GCM) and reconstructed 18 obfuscated modules — Ghidra / Frida / Capstone, with ARM64 lifting.

Homelab Proxmox / TrueNAS / Docker-LXC — where most of the above gets prototyped before it hits the cloud.

Languages

Backend & Payments

Cloud & Infra

Reverse Engineering

• B.S. Nanoscale Engineering @ University at Albany (expected 2027)
• Open to backend / infrastructure and security / reverse-engineering roles

• Email: iqblhussain2024@gmail.com