Hari Krishnan
Polyglot Full Stack Developer and Architecture Consultant, Lean and XP Coach
Bengaluru, India
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Hari Krishnan has over two decades of experience in building high-performing teams, designing scalable systems, and driving technical strategy for large enterprises and high-growth startups across industries like finance, telecom, logistics, and retail. As Founder and CEO of Polarizer Technologies he has led enterprise-wide initiatives in architecture, developer experience, test automation and AI adoption. He combines deep technical expertise with executive vision, having worked closely with CXOs on strategy, delivery assurance, and organizational agility. He is widely recognized for his contributions to API governance, platform engineering, and contract-driven development.
He has spoken at several premier international conferences, actively contributes to several open-source projects. His areas of interest include distributed systems, AI native products, AI augmented and agentic software delivery.
Area of Expertise
Topics
API Days India
AsyncAPI 2.6 to 3.0: Migrating Safely with No-Code Backward Compatibility Checks
GOTO Serverless
Reliable AWS Lambda Data Pipelines with AsyncAPI Specification
https://conferences.gotopia.tech/goto-serverless-bengaluru-2025/sessions/3845/reliable-aws-lambda-data-pipelines-with-asyncapi-specification
Video - https://www.youtube.com/watch?v=3McRayR31D4
APIDays New York
Using GraphQL SDL Files as Executable API Contracts - https://speakerdeck.com/harikrishnan83/using-graphql-sdl-files-as-executable-api-contracts
Unifying OpenAPI & AsyncAPI: Designing JSON Schemas + Examples for Reuse - https://speakerdeck.com/harikrishnan83/unifying-openapi-and-asyncapi-designing-json-schemas-plus-examples-for-reuse
Agile India 2025
API Design Anti-patterns: How to identify & avoid them - https://www.youtube.com/watch?v=U1Di4RyyG4w
DeveloperWeek 2025 Sessionize Event
Functional Conf 2025
The Functional Fix: Kotlin Error Handling Made Elegant - https://www.youtube.com/watch?v=byIcRxtk6gA
APIDays Paris
Contract-Driven Development for Event-Driven Architectures (https://conference.asyncapi.com/venue/Paris)
Slides - https://speakerdeck.com/harikrishnan83/contract-driven-development-for-event-driven-architectures
AsyncAPI Online Conference Edition
Using API spec as an Executable Contract To Mock and Test Microservices
Video - https://www.youtube.com/watch?v=wiM20HTCerM
Slides - https://speakerdeck.com/harikrishnan83/asyncapi-as-executable-contracts
AsyncAPI Conf On Tour 2023
Kafka and JMS Mocking with AsyncAPI using Specmatic
Video - https://youtu.be/9yRf75p_kTU?si=iR4lV_HLaVlUKsrY
AsyncAPI allows us to articulate communication channels between services clearly. What if I told you that this AsyncAPI specification is all it takes for us to quickly spin up mock topics and queues to test our services in isolation?
That is exactly what Specmatic is able to achieve by leveraging AsyncAPI specifications to give us early feedback on our local machines and in our CI pipelines when our service implementations deviate from the API specifications.
In this talk, I will be going over below points in detail:
1. Ability to detect deviation in implementation at a protocol, schema and more during early stages of development to shift left the identification of potential integration issues.
2. Leveraging AsyncAPI specifications to collaborate between teams to develop and deploy microservices in parallel with confidence.
3. How this ability fits into the overall concept of Contract Driven Development.
API World 2022 Sessionize Event
API Specifications Conference 2022
Turn Your OpenAPI Specifications into Executable Contracts
Event - https://sched.co/15pVN
Video - https://youtu.be/U5Agz-mvYIU?si=IbXcmiqrhuYOSLcU
Selenium Conf 2022
Contract Driven Development - Deploying your MicroServices independently without integration testing
TestingUy 2021 Sessionize Event
Agile 2021
Abstract / Teaser - https://vimeo.com/551960536
Video - https://www.youtube.com/watch?v=LaKhBS-_4p4
Hari Krishnan
Polyglot Full Stack Developer and Architecture Consultant, Lean and XP Coach
Bengaluru, India
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