Grejo Joby — Engineering Lead at Media.net

About Me

Builder &
Problem Solver.

Engineering Lead at Media.net with 3.5+ years building high-performance AdTech infrastructure. AI-powered engineer with a product manager's mindset — I scope problems, make the calls, and ship end-to-end. Engineered systems handling 40K+ QPS with sub-10ms latency, drove the Go application stack, and cut cloud spend by $7K/week.

I think like a builder and a PM at the same time: weighing trade-offs, owning roadmaps, and using AI tooling to ship faster without losing rigor. In college: ACM Chairperson, Teknack Gaming Studio Head, and Best Outgoing Student of 2022.

Interests

Go / Golang

Backend Dev

AdTech

Cloud Infra

Product Dev

Domain & DNS

Problem Solving

Teaching

Technical Skills

Languages

Go PHP JavaScript HTML/CSS

Technologies

Aerospike Redis SQL ElasticSearch Kibana Grafana Cloudflare Oracle

Deployment

Docker GKE GCP Jenkins Load Balancers

AI Tools

Claude Cursor

Career

Work
Experience.

Roles where I've built, shipped, and led.

Jan 2026 — Present

Module Lead

Media.net · Mumbai, IN

Cross-Functional Leadership: Technical bridge between Product and Business; lead architecture reviews, rapid incident investigations, and align engineering scope with business outcomes.
AI-Powered Productivity Suite: Lead AI-driven internal dashboards that automate config changes and repetitive engineering tasks across teams.
Engineering Direction: Set technical standards, drive AI-assisted development workflows, and own the roadmap for owned modules.

Leadership Go AI / LLM GCP

Jan 2025 — Dec 2025

Sr. Web Application Developer

Media.net · Mumbai, IN

High-Throughput Adcode Service: Engineered real-time service handling 40K+ QPS with sub-10ms p95 latency. Multi-layer caching (In-Memory & Redis) + pod-warming utility to eliminate cold-start spikes.
Domain Monetization: Ad-serving engine with advanced anti-spam defense. Slashed serving costs by 45%.
Cloud Infra Optimizations: GCP rightsizing reduced weekly spend by $7K (40% savings).

Go Redis GCP GKE AdTech

Jan 2024 — Dec 2024

Web Application Developer II

Media.net · Mumbai, IN

O-LA (From Scratch): Redesigned ad-serving architecture from 2 client I/Os to 0–1. Load time 1s → 400ms for 80% at p95.
Scalability & Resilience: Horizontal scaling for Go apps via Docker multi-stage builds and optimized GKE configs.
Documentation (From Scratch): Internal site with full-text search — reduced doc search overhead across dev and business teams.

Go Docker GKE ElasticSearch

Aug 2022 — Jan 2024

Web Application Developer

Media.net · Mumbai, IN

AdTech solutions in JavaScript, Go, PHP with Aerospike, Kafka, Redis.
Adcode Token (From Scratch): Checksum-based adcode validation — detect and prevent client-side manipulation.
Code Size & Coverage: Reduced JS size 50% via modularization + dynamic script stitching; test coverage to 85% with tree-shaking.
Re-Write: Key role in PHP → Go rewrite, validation, and traffic migration.
Compact URL: Optimized request/response payload via Aerospike offloading for multi-DC traffic.