Available for opportunities

Rajat Kumar Kansal

Software Engineer → Distributed Systems

Software engineer with 4+ years of experience designing and scaling high-throughput, fault-tolerant distributed systems at Amazon and tiket.com. Known for a strong ownership mindset — driving ambiguous projects end-to-end and delivering solutions with measurable business impact.

Java Spring Boot Kafka AWS DynamoDB PostgreSQL Kubernetes LLM Integration

View My Work → Get in Touch

Years Experience

Ownership

Work Style

Problem Solver

Engineering Mindset

Tech Stack

Skills & Technologies

Technologies I use to build scalable, reliable backend systems.

Languages

Java C / C++ Go

Backend & Frameworks

Spring Boot REST APIs Microservices API Design LLD / HLD

Distributed Systems

Kafka gRPC Event-Driven Arch. Async Workflows Sharding Circuit Breakers CDC

Databases

PostgreSQL DynamoDB MongoDB Redis Elasticsearch

Infrastructure & Cloud

AWS (Lambda, SQS, SNS, Fargate, Step Functions) Kubernetes Docker CI/CD

Observability & Reliability

Grafana Prometheus CloudWatch Kibana Opsgenie Runbooks & On-call

AI Infrastructure

Amazon Bedrock LLM API Integration Async AI Pipelines Prompt Engineering Structured Output / JSON Schema

LLMs in Production Systems

Deterministic + AI Hybrid Validation Human-in-the-loop Review Guardrails & Eval Loops Fallbacks, Retries & Timeouts Cost / Latency Budgeting Observability for AI Calls

Learn

Learn Software Engineering

My interview-prep and engineering notes, organised so you can read them topic by topic.

System Design · LLD · HLD · Java · C++ STL

A curated, free learning hub built from the notes I actually used — SOLID, design patterns, how to approach an LLD round, HLD fundamentals, C++ STL → Java mappings, Kafka, Redis, concurrency and more. Pick a topic on the left, read, and ask a question if something is unclear.

Start Learning → Ask a Question

System Design Roadmap HLD Fundamentals LLD Approach SOLID Design Patterns C++ STL Java Essentials Concurrency Kafka Redis & Caching

Free Tool

Daily Accountability Tracker

Built after reading Cal Newport's Deep Work. Free for anyone to use.

Each square you light is a promise kept.
The streak behind you hates an empty day.
You race no one here but yesterday's you —
who left the chart one shade dimmer than today.

Deep work only compounds when it's consistent — and consistency needs a mirror. The heatmap is a leaderboard with one name on it: seeing the streak is what brings you back to add the next square.

Hours per skill · topics covered · gym & meals
GitHub-style heatmap & weekly stats
Data stays in your browser · optional Google Drive sync · no account

Open the Tracker →

Recognition

Achievements

Some highlights from my journey.

🏆

Top 5.9% Globally

Rating 1852 on competitive coding — 90+ contests among ~900K participants.

🎖️

CSI President

Led 10+ tech initiatives, organized 5+ coding competitions, mentored 100+ students.

🥉

Bronze Medalist

NCC Run (2KM), Chitkara University.

📊

9.81 CGPA

B.E. Computer Science, Chitkara University. Graduated May 2023.

🏆

Hackathon Winner

Won Smart-a-thon 2021 by building a scalable solution under time constraints.

👨‍💻

Technical Leadership

Co-led university tech fest, organizing coding challenges, workshops, and sessions for 200+ participants.