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Karthik Krishna

@karthikkrishna

Message

I build scalable Java backend platforms for payments, ecommerce, and enterprise integrations.

India

Message

What I'm looking for

I'm looking to build scalable backend platforms where I can lead technical design, solve payment and enterprise integration challenges, and collaborate with global teams on reliable production systems.

I've built enterprise platforms at Zaps Group, including a payment orchestration platform processing 3,000+ daily transactions and a Mastercard Card-Linked Offers platform.

I design Java and Spring Boot microservices, secure payment flows, REST APIs, and enterprise integrations. My work includes SAML 2.0 and JWT authentication, gateway routing, automated retries, shared platform modules, and a 13-service microservices architecture.

For a freelance ecommerce SaaS product, I led backend architecture, developer workflows, GCP deployment, API design, security protocols, database schemas, and CI/CD practices.

I've also delivered enterprise applications for Adidas, FSSAI, Google, Wisestella, and ecommerce clients, integrating Databricks, SharePoint, AWS S3, Shopify, WhatsApp, Salesforce, and PostgreSQL.

Experience

Work history, roles, and key accomplishments

Java Developer

Zaps Group

Jul 2025 - Jul 2026 (1 year)

Architected and developed two major enterprise platforms: a Payment Orchestration Platform and a Mastercard Card-Linked Offers platform. Implemented microservices architecture with 13 services, secure SSO, and optimized payment flows.

Java Spring Boot Microservices JWT REST APIs Maven Feign Design Patterns

Lead Software Engineer

Freelance Startup SaaS Product

Feb 2025 - Jul 2025 (5 months)

Designed and implemented end-to-end architecture for a SaaS platform, deployed on Google Cloud Platform. Led a team in backend development, defined RESTful APIs, security protocols, and established engineering best practices.

Java Spring Boot Microservices REST APIs JWT Google Cloud Platform CI CD Agile

Full Stack Developer

IDA IT Services

Oct 2023 - Jan 2025 (1 year 3 months)

Designed and implemented a four-layer enterprise application for Adidas, integrating data sources like Databricks, SharePoint, and AWS S3. Developed custom PDF parsers, SSO/OAuth 2.0 authentication, and contributed to a React component library.

Java Spring Boot React REST APIs OAuth SSO Databricks SharePoint S3 PostgreSQL JavaScript

Implementation Engineer

Hooper Labs Inc

Feb 2022 - Feb 2023 (1 year)

Designed and developed web applications for FSSAI, built backend services for ecommerce, and integrated third-party platforms like Shopify, WhatsApp, and Salesforce. Led client onboarding and served as technical SME.

Java Spring Boot REST APIs Webhooks Shopify Salesforce Supply Chain Order Management Data Migration

Solutions Engineer

Hooper Labs Inc

Feb 2021 - Feb 2022 (1 year)

Engaged with stakeholders to gather requirements, designed and developed end-to-end applications, and translated business goals into technical specifications. Collaborated cross-functionally to deliver user-centric solutions.

Java Spring Boot REST APIs System Design Agile Stakeholder Management

Content Analyst

Cognizant

Oct 2018 - Nov 2019 (1 year 1 month)

Aggregated and validated business data from disparate sources for client Google. Created Excel and PowerBI reports for strategic insights and collaborated cross-functionally to ensure data accuracy.

Data Analysis Excel Power BI Reporting