sandeep kumar sahu
Contact details — on requestProof of Work — on request
Experience
Full Stack Developer
VNETIX IT Solutions Pvt. Ltd. · Apr 2025 – Present
- • Architected and shipped a multi-module fintech payment platform (digital wallet, UPI, payment gateway integration, fintech API, merchant POS) serving real-time transactions — built on Node.js, TypeScript, and MongoDB within an Nx monorepo, reducing cross-team coupling by ~40%
- • Designed and implemented a role-based access control (RBAC) system with JWT authentication and Zod schema validation, hardening API security across 10+ endpoints and eliminating an entire class of authorization bugs
- • End-to-end engineered UPI payment flows, cashback distribution, and merchant payout pipelines — integrating retry-safe cron jobs and structured logging to ensure financial reconciliation accuracy and audit traceability
- • Built and shipped 5+ React Native (Expo) features with Zustand state management, abstracting shared business logic into reusable modules that cut mobile feature delivery time by an estimated 30%
- • Rebuilt the merchant dashboard UI with React, Vite, and Material UI — reducing task completion time for merchants by an estimated 25% through cleaner navigation and real-time transaction visibility
V
React Native Developer
Vnetix IT Solution Pvt. Ltd. · Apr 2025 – Jun 2026
- Architected and shipped React Native (Expo) features for consumer and merchant apps - wallet management, UPI payment flows, cashback rewards, and POS payment screens - across both Android and iOS platforms.
- Managed complex UI state with Redux and Zustand within an Nx monorepo shared utility layer, applying Redux-Saga for async side-effect management and scalable action flow control.
- Integrated RESTful APIs and WebSocket communication channels with fully type-safe contracts (TypeScript strict mode), implementing defensive error handling, loading states, and optimistic UI updates.
- Wrote clean, reusable, and unit-testable React Native components with Jest test coverage across UI layers and API integration points, maintaining high code quality and maintainability standards.
- Identified and resolved performance bottlenecks using React Native debugging and profiling tools (Flipper, Reactotron), improving app responsiveness and crash rates in a live financial environment.
- Owned end-to-end cross-platform delivery: managed build pipelines (EAS Build), app signing, and Play Store / App Store release workflows using Git Flow for version control.
- Collaborated closely with product and design teams to translate low- and high-fidelity designs into pixel-accurate, responsive mobile Uls following UI/UX design principles.
Software Development Engineer 1
Photon · May 2024 – Oct 2024
- * Delivered a full-stack library management platform end-to-end — TypeScript throughout, CI/CD pipeline, secure authentication, and book checkout flows — achieving 100% type safety across all API contracts and cutting integration bugs to zero in QA
- * Led WCAG 2.1 AA accessibility audit and remediation, bringing the platform into full compliance and making it usable for users with visual and motor impairments — increasing the software's addressable user base
Software Engineer I - Frontend & Mobile
Photon · May 2024 – Oct 2024
- Contributed to a React Native mobile module within a TypeScript platform project, applying strict type safety, scalable component patterns, and Babel/Webpack-aware bundling for cross-platform consistency.
- Implemented WCAG 2.1 / Section 508-compliant accessibility features across mobile UI layers - keyboard navigation equivalents, ARIA-style semantics, focus management, and screen reader support.
- Delivered well-tested code with Jest unit and integration test coverage across UI components and API integration layers, ensuring robust and regression-safe builds.
- Practised Agile/Scrum methodology throughout the project lifecycle, participating in sprint planning, daily stand-ups, and retrospectives to maintain delivery velocity.
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React Native Developer → Senior React Native Developer
ETPL/eGenius · May 2021 – Jan 2024
- Spearheaded the full rewrite of a legacy EdTech platform into a modern TypeScript-based application, delivering cross-platform releases to Android (Play Store) and iOS (App Store) - promoted to Senior Developer within the same engagement.
- Built a multi-tenant white-label React Native architecture serving multiple educational institutions from a single codebase, using feature toggles and preference-driven configuration to generate client-specific builds with tailored branding and feature sets.
- Built a multi-tenant ERP system for educational institutes with automated database provisioning per organisation, using Webpack / Babel-compatible bundling strategies.
- Built a view-mode counterpart for a drag-and-drop design customisation engine in React Native, driven by REST API JSON responses for runtime rendering - enabling dynamic, data-driven layouts without app updates.
- Developed and published a private NPM design system library standardising shared Ul components across web and mobile surfaces, accelerating feature delivery across multiple internal teams.
- Developed a user-centric enterprise portal with SSO-based authentication and a configurable, API-driven navigation drawer - delivering a flexible, data-driven mobile Ul layer.
- Integrated Firebase for push notifications, remote config, and cloud-based data storage, improving real-time engagement and reliability for end users.
- Mentored junior developers on TypeScript best practices, component architecture, performance optimisation, Git Flow, and code review standards.
React Native Developer
eReleGo Technologies Pvt Ltd (ETPL) · May 2021 – Dec 2023
- * Delivered 50+ cross-platform React Native (Expo) apps to the Google Play Store and App Store — each with REST API integration — collectively reaching 50,000+ active users across the EdTech portfolio
- * Led mobile feature development for an EdTech platform serving 50000+ learners — implemented push notifications, offline support, and in-app payments, improving DAU by 30%
- * Reduced app crash rate by 90% through systematic error boundary implementation and crash analytics integration (Sentry/Firebase Crashlytics)
Skills 0 proven through work
Also works with
Application Performance OptimizationSelf-Directed LearningUser Experience ImprovementCreative BrainstormingTeamworkApplication MaintenanceSoftware Development PracticesModule ManagementAdmin Panel Feature DevelopmentVector Database UsageData ModelingDesign Systems DevelopmentComponent-Based ArchitecturePlugin DevelopmentFeature & Setting ConfigurationData Unification and NormalizationMulti-Tenant Architecture DesignCode RefactoringLegacy System MigrationUser Interface NavigationWeb Accessibility ImprovementE-Learning Platform DevelopmentRow-Level Security ImplementationData Access Layer DevelopmentSecure Data HandlingDatabase ManagementData Integrity ManagementCustomer Support System DevelopmentChatbot DevelopmentTechnical TroubleshootingAI Agent DevelopmentPrompt EngineeringAI Solution DesignLarge Language Model ConceptsAPI IntegrationTransaction Processing SystemsFinancial Compliance ImplementationApplication DeploymentDigital Wallet DevelopmentProject Architecture PlanningReact DevelopmentFront-end DevelopmentBackend DevelopmentNode.js DevelopmentMongoDBFull-stack DevelopmentReact Native Development
Proof of Work
Proof of Work
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Education
Master of Science, Information Technology
Punjab Technical University · 2018 — 2020
Bachelor of Computer Applications, Computer Applications
Punjab Technical University · 2015 — 2018
Contact details
Contact details
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