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AboutMe
Karan JagdishFull-Stack Engineer | Technical Lead | Scalable System Architect

I'm a Technical Lead with over 5 years of experience building enterprise-grade platforms that solve complex business problems. Originally from India, I was educated and spent my first five professional years in Bengaluru—India's tech hub—where I honed my skills working with Fortune 500 clients. I've recently made the move to Abu Dhabi as a UAE resident, bringing a global perspective to solving both local and international technology challenges.

My journey in software engineering has taken me from individual contributor to leading cross-functional teams of 20+ engineers, working across healthcare, SaaS, and talent management domains. I thrive at that sweet spot where clean code meets great collaboration—where technical decisions enable teams to move faster, not slower.

Currently leading

  • Talent acquisition platform with runtime-editable hiring workflows using Temporal orchestration, featuring dynamic job requisition approvals and complete audit trails for a U.S. private equity firm
  • Performance evaluation system enabling 360° reviews, stack ranking, and performance improvement plans for 500+ employees
  • Engineering team of 6 building production microservices on AWS EKS

5+

Years of experience

20+

Engineers Led

3x

Quaterly Awards

$120K+

Annual Savings

50%

Performance Gains

90%

Intern Conversion

What I do

I architect and build cloud-native microservices using Java/Spring Boot, Node.js, and React, deployed on AWS and Kubernetes. My focus is on creating systems that don't just work—they scale, perform, and deliver measurable business value.

From zero-downtime migrations to implementing distributed workflows with Temporal, I've tackled challenges across the full stack. I've designed secure multi-tenant systems that let 15+ enterprise clients share infrastructure without compromising on security or performance, optimized databases (PostgreSQL, DynamoDB, Cassandra), and built event-driven architectures that process hundreds of requests per second.

But technical excellence is only half the story. I believe the best engineering happens when teams are empowered, processes are clear, and architecture decisions are made with both developers and users in mind.

Technical Expertise

Backend & Services

  • Java (8-21)

  • Spring Boot

  • Node.js / Express

  • Microservices Architecture

  • REST APIs & GraphQL

  • Temporal Workflows

Frontend & Services

  • React / Vite

  • TypeScript

  • Tailwind CSS / Styled Components

  • Redux Toolkit

  • RTK Query / TanStack Query

  • Responsive Design

Data & Security

  • PostgreSQL & MySQL

  • DynamoDB & Cassandra

  • Auth0 & OAuth2/OIDC

  • Redis (Caching & Pub/Sub)

  • Multi-tenancy Patterns

Cloud & Infrastructure

  • AWS (EC2, EKS, Lambda, S3)

  • Kubernetes & Docker

  • Terraform & Helm

  • Localstack

  • Prometheus & Grafana

Featured Professional Experience

🎯 Talent Acquisition Platform

Tech Stack: Java/Spring Boot 3, Temporal, Kubernetes, PostgreSQL, AWS EKS / K8s, Terraform, CI/CD, Prometheus, Grafana, LocalStack

Led team of 6 building production-grade ATS platform enabling companies to define role-specific hiring workflows that can be edited during runtime—no redeployment needed. Leveraged Temporal for complex orchestration including dynamic job requisition approvals that adjust based on field changes (budget, level, department), with complete audit history for compliance.

Key Features: Runtime workflow modification, field-triggered approval routing, candidate pipeline management, full audit trails, Strategy-based execution patterns

Impact: Zero-downtime launch, 100+ parallel workflows, 60% faster hiring cycles, complete approval transparency

📊 Performance Evaluation Platform

Tech Stack: React, Express/Node.js, PostgreSQL, Tanstack Query, Drizzle ORM

Delivered full-stack performance management system from concept to production in 2 months. Platform enables companies to execute comprehensive performance reviews with 360° evaluations, comparative stack ranking across teams, and structured performance improvement plan (PIP) creation with goal tracking and progress monitoring.

Key Features: Multi-rater / 360° feedback collection, stack ranking, PIP templates and tracking, real-time dashboards, HRIS system integration

Impact: 500+ employees evaluated, 2-month delivery timeline, 20+ React screens, 30+ REST APIs

💳 TestRail Financial Migration and Features Enhancement

Tech Stack: PHP, Stripe, Event-Driven Architecture, Docker

Spearheaded migration from legacy cron-based billing to event-driven Stripe integration for $2M+ revenue platform. Led team of 5 through zero-downtime production cutover serving Fortune 500 customers including Paypal, Amazon, and Adobe. In parallel, led a 10 member team to build a new features platform for TestRail.

Impact: 50% payment latency reduction, improved reliability, zero revenue loss during migration

Healthcare Exam Platform

Tech Stack: AWS Step Functions, DynamoDB, Lambda, Spring Boot, Drools Rule Engine, Redis (ElastiCache), AWS SQS, AWS EKS / K8s, Terraform, CI/CD, Prometheus, Grafana

Re-architected legacy monolith into cloud-native microservices for doctor exam assignments across U.S. and Canada. Achieved 100+ req/s throughput using Drools rule engine enabling dynamic, no-downtime rule modifications without code deployment. Implemented Redis-based caching for cross-service API calls and pub/sub pattern for invalidating compiled rule engines across multiple HA service instances.

Key Features: Dynamic rule modification via Drools, distributed cache invalidation with Redis pub/sub, parallel processing with Spring Async, secure multi-tenancy with row-level security

Impact: 3x scalability improvement, 100+ req/s sustained throughput, 40% cost reduction, 15+ enterprise clients on shared infrastructure, zero-downtime rule updates

AWS Cost Optimization Initiative

Tech Stack: AWS Cost Explorer

Analyzed and optimized 15 customer AWS accounts using Cost Explorer, identifying savings opportunities through EC2 right-sizing, Reserved Instances, S3 storage class optimization, and EBS volume cleanup.

Impact: $10,000/month in sustained savings ($120K+ annually), improved resource utilization by 45%

Impact & Achievements

🏆 Three-time Drummer Award Winner (Jan 2025, Nov 2023, Nov 2022) - Recognized for technical leadership in Temporal orchestration, TestRail scaling to 20-engineer team, and healthcare microservices delivery

💰 $120K+ in annual AWS cost savings across 15 client accounts through EC2 right-sizing, Reserved Instances, S3 storage optimization, and EBS volume cleanup

50% payment latency reduction through event-driven Stripe integration for TestRail's $2M+ revenue platform with zero downtime

📚 Mentored 50+ engineers and interns through Java/Spring/AWS bootcamps, achieving 90% full-time conversion and 85% 6-month retention

🚀 10+ zero-downtime production releases for platforms serving 500+ Fortune 500 companies, maintaining 99.9% uptime

🔐 Designed secure multi-tenant architecture supporting 15+ enterprise clients on shared infrastructure with strict data isolation

Beyond the Code

Outside of engineering, I'm passionate about knowledge sharing and mentorship. I've designed bootcamps that trained 50+ engineers with a 90% conversion rate, and I believe the best way to master something is to teach it. Seeing junior engineers grow into confident contributors is one of the most rewarding parts of leadership.

I'm also an advocate for sustainable engineering practices—writing code that's not just functional today, but maintainable five years from now. That means comprehensive testing (I once increased test coverage from 20% to 80%), infrastructure as code, and observability baked in from day one. I'd rather spend an extra day building it right than spend weeks firefighting production issues.

When I'm not architecting systems or reviewing pull requests, I stay current with emerging technologies and best practices in distributed systems, cloud architecture, and engineering leadership. I'm particularly interested in the evolution of workflow orchestration systems and how they're changing the way we build complex, long-running processes.

Let's Build Something Together

Currently based in Abu Dhabi, UAE and available for opportunities in the region or remote roles. I'm particularly interested in:

  • 🏗️ Technical leadership roles in high-growth startups or scale-ups
  • ☁️ Cloud-native architecture and AWS optimization projects
  • 🚀 Greenfield platform development with modern stacks
  • 👥 Opportunities to build and mentor engineering teams

Whether you're looking for technical leadership, cloud architecture expertise, or a passionate engineer who can bridge technology and business value—let's connect.

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