Headline

Senior SWE @ Coindcx · Payments Infrastructure & Web3 Systems

About

I build backend systems for high-stakes financial infrastructure - payment pipelines, banking integrations, and the services that keep them reliable at scale. At CoinDCX, I work on our fiat deposit and withdrawal flows, focused on reliability, partner integrations, and API performance. In the last quarter alone, I helped drive deposit success rate from 72% to 76.6% through partner diversification and retry logic improvements, scaled our direct banking integrations from 1 to 3 partners, and architected a backup withdrawal partner to keep fiat off-ramps available during primary partner downtime. Before moving into payments, I spent two years building CoinDCX's Web3 developer platform. I architected OktoKit (a modular multi-chain SDK for EVM, Solana, and Aptos), was a core developer on the Okto SDK, and shipped the AA Wallet Service with Paymaster support aligned to EIP-4337. That background still shapes how I think about reliability, developer experience, and designing systems that external partners integrate against. I care most about the parts of payments infrastructure users never see - the retry logic, partner failovers, and p99 tails that determine whether a deposit actually lands. Outside work, I spend time with family, watch movies, or walk at night. Also writing occasionally at sparshagarwal.xyz. Reach me at sparshaga25@gmail.com.

Location

Bengaluru

AI stack

claude code

codex

cursor

hermes agent

opencode

Work experience

Senior Software Engineer at CoinDCX, Apr 2025 - Present · 1 yr 5 mos, Bengaluru, Karnataka, India, Payments Infrastructure - Helped drive deposit success rate from 72% to 76.6% in a single quarter through payment partner diversification, flow optimization, and improved retry logic. - Established direct banking connections for fiat deposit flows, scaling from 1 to 3 bank partners and boosting customer conversion by 20% with improved reliability and uptime. - Architected a backup withdrawal partner integration, ensuring continued fiat off-ramp availability during primary partner downtime. - Profiled and optimized hot-path APIs, reducing P95 latency by over 70% and improving platform responsiveness at scale. - Contributed to ongoing migration from legacy monolith to microservices architecture, shipping critical infrastructure upgrades alongside the platform team. Web3 Developer Platform - Architected OktoKit, a modular Web3 SDK with first-class EVM support and extended compatibility for Solana and Aptos; ships with plug-and-play adapters for React, Vue, and React Native. - Refined SDK APIs with 10+ external dApp partners, aligned with EIP-4337, EIP-6963, WalletConnect, and Wagmi standards.

Software Engineer at CoinDCX, Apr 2024 - May 2025 · 1 yr 2 mos, Bengaluru, Karnataka, India, - Core developer on Okto SDK (200K+ DAU), enabling wallet and identity integration across EVM, Solana, and Aptos; shipped JS SDKs for React and React Native. - Built the AA Wallet Service with Paymaster support in Go and Node.js, integrated with Biconomy and aligned with EIP-4337. - Designed and shipped a production-grade Client Dashboard using Next.js, TanStack Query, and shadcn/ui for SDK partners to manage sessions and credentials. - Built telemetry and debugging infrastructure with real-time dashboards for SDK usage insights and faster client support resolution. - Mentored junior engineers and supported developers at ETHIndia, ETHDenver, and Unfold hackathons.

Associate Software Engineer at CoinDCX, Jun 2023 - May 2024 · 1 yr, India, - Built WalletConnect integration, in-app DApp browser (Flutter), and backend WalletConnect Service (Go) for Okto Wallet, supporting EVM and Solana transaction flows for 100K+ users. - Developed the first-generation JavaScript SDK for third-party DApp integration, laying the groundwork for the Okto developer platform. - Implemented Wallet ID using PolygonID (Iden3 Protocol), handling both frontend and backend integration for decentralized identity.

Software Engineering Intern at CoinDCX, Jan 2023 - Jun 2023 · 5 mo, Bengaluru

Software Engineer Intern at Raccord IT Solutions, LLP, May 2021 - Oct 2021 · 6 mos, Jaipur, Rajasthan, India, - Built and maintained the frontend of an Admin Dashboard for Organization Connect, an enterprise connectivity platform, using React, TypeScript, and Material UI. - Collaborated with a team of 5 interns under senior engineering supervision; contributed to feature scoping and frontend documentation.

Education

Bachelor of Technology - BTech, Computer Science, JK Lakshmipat University, Jaipur