Java

I need a seasoned Android reverse engineer to dig into my own application and show, step by step, how its drm_id, x-cit, x-sig, the full Client Attestation string, and any related request signatures are created on the device... (Budget: $30 - $250 USD, Jobs: Android, Cryptography, Debugging, Java, Mobile App Development, Reverse Engineering, Scripting, Software Architecture, Software Development, Software Testing)

I want to build a Neuro-Symbolic AI–based Pune Traffic Control and Navigation System. This means: There will be AI models to answer queries. Along with that, there will be rule-based logic also. For example: Vehicles must not go the wrong way... (Budget: ₹1500 - ₹12500 INR, Jobs: Flutter, Java, Machine Learning (ML), Microservices, Python, REST API, Software Architecture, Vue.js)

A complete, source-available payment-processing module is needed so it can drop straight into an existing FinTech stack via REST-style APIs. The core must already handle credit & debit cards, popular e-wallets, standard bank transfers and AEPS rails, all in a multi-currency environment... (Budget: $250 - $750 USD, Jobs: API Development, Database Design, Java, Node.js, Payment Processing, Python, REST API, Software Architecture)

I need a complete Android marketplace application that lets users browse, list, and securely purchase items inside one intuitive interface. The core flow is similar to other peer-to-peer buying platforms:... (Budget: $115 - $200 HKD, Jobs: Android, Android App Development, App Design, iPhone, Java, Kotlin, Mobile App Development, UI / User Interface)

I already have the unsigned XML, a valid X.509 certificate with its private key, the full specification, and the link to the government-run verification portal. Your job is to write clean Java code that... (Budget: $30 - $250 USD, Jobs: Cryptography, Java, Software Architecture, Software Engineering, XML)

I’m arranging a short-term training program for an engineering college and need a freelance technical trainer who can deliver an engaging Java Data Structures & Algorithms series to intermediate-level students... (Budget: ₹37500 - ₹75000 INR, Jobs: Coding, Data Analysis, Hadoop, Java, JavaFX, Python, Software Development, Teaching/Lecturing)

I need a complete build of an Android-only social networking application. The app should let users register, create profiles, share posts, comment, like, and chat in real time—essentially the familiar... (Budget: $250 - $750 USD, Jobs: Android, Android App Development, Java, Kotlin, Mobile App Development, Mobile Development, PhoneGap, UI / User Interface)

I need a full-stack developer to take an Android e-commerce idea from concept to a polished, production-ready release. The app will let users browse, select, and purchase on-demand services rather than... (Budget: ₹75000 - ₹150000 INR, Jobs: Android, Android App Development, AngularJS, API Development, Full Stack Development, Java, Kotlin, Mobile App Development)

I’m ready to bring a new social networking experience to Android and need a skilled mobile developer who can take it from concept to Google Play. The app will be Android-only for now, so I’m looking for... (Budget: $15 - $25 USD, Jobs: Android, Android App Development, App Design, App Development, iPhone, Java, Kotlin, Mobile App Development, Mobile Development)

I need a straightforward Android application whose core job is to let customers move money with ease. The app’s first screen should go straight to a clean funds-transfer flow—no extra bells or whistles—so... (Budget: ₹1500 - ₹12500 INR, Jobs: Android, Android App Development, API Development, Java, Kotlin, Mobile App Development, Security, Software Architecture)

We are seeking a skilled developer to assist in building audio software for our custom-designed speaker and microphone. The project involves using ALSA (Advanced Linux Sound Architecture) and PulseAudio libraries to ensure optimal audio performance and functionality... (Budget: $250 - $750 USD, Jobs: Audio Engineering, Audio Processing, Audio Production, Audio Services, C Programming, C++ Programming, Java, Linux)

I need a simple, reliable way to answer incoming WhatsApp messages without lifting a finger. Any time a chat arrives—day or night—the system should send a predefined automatic reply so customers know we’ve received their request and when they can expect a follow-up... (Budget: $2 - $8 USD, Jobs: API Integration, Automation, Chatbot, Java, JavaScript, PHP, Software Architecture, Web Hosting)

I need a self-contained Python package that wraps the Fraunhofer-AISEC Code Property Graph (https://github.com/Fraunhofer-AISEC/cpg) and lets me create, inspect, and visualise CPGs through a clean web interface... (Budget: $10 - $140 USD, Jobs: Django, FastAPI, Flask, GraphQL, Java, JavaScript, Python, Web Development)

We're seeking an experienced backend developer to build the robust server-side infrastructure for Source Impact, a fully-functional mobile app connecting influencers, brands, and agents in a commission-based marketplace... (Budget: $750 - $1500 USD, Jobs: API Development, Backend Development, Database Management, Java, JavaScript, MySQL, PHP, REST API, SQL, Stripe)

Locatalyze Website Development (Frontend + Backend + Portal + Deployment) About the Company Locatalyze is a location-intelligence platform helping small businesses choose the best suburb for expansion... (Budget: ₹1500 - ₹12500 INR, Jobs: Data Analysis, Data Mining, Data Processing, Java, Large Language Model, Machine Learning (ML), Natural Language Processing, Web Scraping)

I need twelve Android users to help me measure how my app affects battery life during heavy, real-world use over a 14-day window. The sole focus is performance, specifically battery usage when the phone... (Budget: $2 - $8 AUD, Jobs: Android, Android App Development, Android SDK, Android Studio, Android UI Design, Data Collection, Java, Mobile App Development, Mobile App Testing, Testing / QA)

I already own a valid Codecanyon licence for the Dooo Movie application and my entire catalogue of movies, artwork and metadata is organised and ready to go. What I need now is a seasoned Android developer... (Budget: ₹600 - ₹1500 INR, Jobs: Android, Android App Development, App Development, Java, Mobile App Development, Software Architecture, Software Development)

I'm currently seeking a skilled and reliable web developer to join me on an hourly basis. Whether your expertise lies in .NET, Java, Python, React, Angular, or any other modern web technology, I’m open to collaborating with developers who are passionate about building great solutions... (Budget: min $50 USD, Jobs: .NET, Angular, AngularJS, Django, Java, JavaScript, Python, Web Development)

I’m ready to have a lightweight Android application built from the ground up, and the single must-have feature is push notifications. Whether you prefer Firebase Cloud Messaging, OneSignal, or another... (Budget: $15 - $25 USD, Jobs: Android, Android App Development, Android Studio, Java, Kotlin, Mobile App Development, PhoneGap, Software Architecture)

I’m building a native Android application, fully localized in Arabic and English, that makes daily Qur’an memorisation structured, gentle, and engaging. Core flow • Each day the user selects one or more verses (āyāt)... (Budget: $30 - $50 USD, Jobs: Android, Android Studio, HTML5, iPhone, Java, Kotlin, Mobile App Development, Mobile Development)