Manmohan Kumar

Contact details — on requestProof of Work — on request

Experience

Senior Android Developer

BabyBillion: Kids Learning App · Jan 2026 – Present

Not yet confirmed

Built kids' learning app from scratch, achieving 1M+ downloads on Play Store with 99.9% crash-free rate & 4.7 rating.
Architected reels-like video learning with adaptive streaming and preloading, delivering buffer-free playback even on 2G/3G networks.
Built age-based content categorization with intelligent prefetching and offline support, reducing load time by 35% and increasing session duration by 25%.
Integrated Razorpay & PhonePe PG supporting 10+ payment methods, achieving 99.5% transaction success rate for seamless subscriptions.

Senior Android Developer

Zaggle Ocean Prepaid Limited · Apr 2025 – Dec 2025

Not yet confirmed

Led architecture and end-to-end development for core Android application features used by 10,000+ users.
Enhanced app stability by integrating Firebase Crashlytics and driving a 30% reduction in crash rates.
Mentored 3+ junior developers on code quality, architecture patterns, and best practices.
Delivered 5+ high-impact feature releases 20% ahead of schedule by coordinating with cross-functional teams and providing hands-on technical leadership throughout the project lifecycle.

Android Developer

Zaggle Ocean Prepaid Limited · Sep 2022 – Mar 2025

Not yet confirmed

Played a major role in revamping the entire Zaggle app, improving user experience, performance, and scalability through modern architecture and optimized codebase enhancements, resulting in an increase of the Google Play Store rating from 3.2 to 4.6.
Migrated 20% of legacy UI codebase from XML layouts to Jetpack Compose, resulting in a streamlined, more maintainable interface and a 30% reduction in UI bugs.
Built Self Booking Tools module leveraging EMT APIs, enabling 5,000+ users to access real-time flight search and booking functionality, improving booking efficiency by 25%.
Designed and produced a comprehensive travel module for the Titan client, supporting flight, train, bus, and hotel bookings, which increased client engagement by 30% and streamlined user journey.
Delivered lead management and consumer apps for enterprise clients, increasing data processing speed by 40% using Kotlin, Java, Retrofit, and MVVM/MVP.

Software Engineer Intern

Zaggle Ocean Prepaid Limited · Jan 2022 – Aug 2022

Not yet confirmed

Built 3+ proof-of-concept Android apps for new business ideas, collaborating with senior engineers to implement best UI/UX and architecture practices, accelerating validation by 40%.
Engineered backend REST APIs improving reporting speed by 15%.
Implemented an Expense Management System web app with React, Spring Boot, and Java, serving 1,000+ users.

Skills 0 proven through work

Also works with

UI InteroperabilityTeam Effectiveness CoachingRetrofit UsageFonseca UsageAndroid Jetpack UsageProactive InitiativeProduction Environment SupportTechnical Knowledge SharingVerbal CommunicationAdaptabilityTeam LeadershipMaintainability DesignProduct Lifecycle ManagementTechnical TroubleshootingProblem SolvingProduct DevelopmentLegacy System MigrationERP Platform DevelopmentRegression TestingUI TestingMVI ArchitectureNavigation DesignJetpack Compose DevelopmentAndroid UI XML DevelopmentFrontend Architecture MigrationPagination ImplementationJSON Data HandlingComponent-Based ArchitectureService Layer Architecture DesignConcurrent Workflow ImplementationVariable Data HandlingError HandlingResponsive UI ImplementationStreaming Data ProcessingWorkflow State ManagementAPI IntegrationRelease ManagementSoftware Development PracticesFull-stack DevelopmentREST API Endpoint DevelopmentAirline Reservation System DevelopmentAI-Powered PersonalizationCDN Configuration & ManagementFile Download ImplementationExploratory Data Analysis (EDA)KPI AnalysisObservability Platform DevelopmentRecommendation Feature DevelopmentStrategic PlanningProcess ImprovementPerformance Metrics AnalysisVideo Playback ImplementationApplication State ManagementSystem Metrics CollectionCloud MonitoringScalable System DesignSoftware Quality AssuranceCross-Departmental CoordinationRazorPay IntegrationPayment Gateway IntegrationProduction Deployment VerificationApp Store OptimizationApplication MonitoringAnalytics ImplementationAsynchronous ProgrammingOffline Application DevelopmentClient-Side Caching StrategiesData CategorizationVideo Streaming ImplementationUser Interface DesignKotlin DevelopmentClean ArchitectureMVVM ArchitectureRequirements AnalysisProject Architecture PlanningMobile Application Development

Proof of Work

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Education

Bachelor of Technology, Computer Science and Engineering

Heritage Institute of Technology · 2018 — 2022

Links

linkedin.com/in/manmohan-kumar-6851571b7

Contact details

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