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Shardul Kavar

@shardulkavar

Backend engineer building payment infrastructure at Rejoicehub LLP, including integrations with 25+ payment service providers.

India

Message

At Rejoicehub LLP, I worked on fintech and enterprise platforms, including Juno Markets, where I built and owned a payments microservice integrating 25+ payment service providers. I also implemented a real-time KYC/AML pipeline using Sumsub for cross-border fiat and crypto transactions.

As a freelance Backend Developer, I architect and deliver fintech solutions focused on payment infrastructure and third-party APIs. I use AI-assisted workflows and custom MCP servers, while reviewing, testing, and securing code before it reaches production.

Experience

Work history, roles, and key accomplishments

Current

Backend Developer (Freelance)

Current

Self-Employed

Sep 2025 - Present (1 year 1 month)

Architecting and delivering full-stack fintech solutions as an independent consultant, focusing on payment infrastructure and third-party API integration. Leveraging AI-assisted development workflows to achieve 3x development velocity while maintaining production-grade code quality and security standards.

NodeJS TypeScript Payment Infrastructure Third Party API Integration Claude Code GitHub Co Pilot AI assisted Development

Backend Developer

Rejoicehub LLP

Jan 2022 - Aug 2025 (3 years 7 months)

Spearheaded backend architecture for high-stakes fintech and enterprise platforms, influencing development standards and architectural decisions. Led technical delivery within a 20+ member cross-functional team, fostering agile collaboration and ensuring seamless feature rollouts and product stability.