Functional Offline POS System

@kabirchy

Hi there, I understand your challenge with maintaining sales operations in remote areas where connectivity is unreliable. Your multi-service business involving minerals supply, transportation, and heavy machinery rentals requires a robust offline POS system that can handle transactions seamlessly regardless of internet availability. I will develop a comprehensive offline POS solution using .NET and C# with SQLite database integration to ensure local data storage and synchronization capabilities. The system will include features for inventory management, transaction recording, customer tracking, and real-time sync when connectivity returns. I'll implement proper data encryption and backup mechanisms to prevent any loss during offline operations. The architecture will support both desktop and mobile platforms, allowing your field teams to process sales, manage rentals, track mineral supplies, and handle transportation services efficiently. The system will automatically sync all offline transactions once internet connection is restored, maintaining accurate records across your entire operation. Best Regards, Khorshed Alam, RS Software

@mehta2010

Dear client, Kindly clarify whether your budget for pos application is 30 usd? I have a readymade offline first pos but not in 30 usd it is much more then that. Reply back to my bid and we can then discuss

@mrresearcher99

Hello, I have recently developed POS system for service-based company. I can build a responsive offline-first POS application for Windows laptops and Android tablets, using React Native for field usability, Node.js REST APIs, and MySQL or PostgreSQL for reliable data management. The application will store sales, inventory, customer profiles, and pending transactions locally when connectivity is unavailable. Once the connection returns, a secure sync process will upload queued records, prevent duplicates, and handle conflicts safely. Reports can be filtered by date, location, service type, and staff member, while manual receipt transactions can be reconciled through the required protocol or an equivalent workflow after confirming its technical details. My experience with POS workflows makes me well suited for this project. Best regards

@rbtech1984

Hello!! Your field teams need a reliable offline POS that records sales without connectivity and automatically synchronizes all transactions when the connection returns. * Will the system mainly be used on Android tablets, Windows laptops, or both? * Should staff work with separate accounts and permissions? * Do you already have the exact requirements for protocol 201.3? The solution will include a local offline database, queued transactions, reliable synchronization with conflict handling, inventory and customer management, flexible sales reports, manual transaction recording, and a responsive interface for field use. Source code, installation instructions, and a clear user guide will also be provided. Relevant offline business applications have been developed with a strong focus on data reliability, synchronization, and uninterrupted field operations. Let us discuss your workflow and preferred platform in chat. Best regards Farhin B

@denisSolution

Hi, Offline-first POS for field teams makes sense—handling inventory, customers, and sales while disconnected, then syncing later is the core challenge here. A local SQLite store with a conflict resolution layer should cover it, since SQLite is reliable on Windows and Android and supports transactions. For the manual transaction protocol you mentioned, I’d expose a simple CLI or API call that writes to the local queue with a manual-sale flag, then reconciles on sync. I’ve built similar systems where inventory had to stay consistent across multiple offline devices, using optimistic locking and timestamp-based merges. For the reports, filtering by date or location would come from the same local store, with a background job that pushes changes up when online. The tricky part is usually the sync logic—deciding what wins when two devices edit the same record offline, and how to handle partial failures during push. A simple version vector or last-write-wins with client IDs should keep it manageable without over-engineering. I can start working right away. Let's connect and discuss the details. Thanks, Denis.

@waqaswebmaster

Your goal is clear: improve Google visibility with work that produces measurable gains, not just a generic SEO report. I’d start with Search Console and Analytics to identify the pages, queries, technical issues, and ranking blockers with the biggest opportunity. From there I’d optimize high-value pages across titles, metadata, schema, internal linking and search intent, then build a clean white-hat backlink plan with relevant outreach targets and anchor mapping. I’d also identify content gaps and refresh opportunities to strengthen topical relevance, then compare impressions, clicks, rankings and organic traffic before and after the work. I work on US hours with dedicated focus, and every deliverable comes with a 100% satisfaction and performance guarantee. Open the chat and I’ll share the most relevant SEO samples, process, and a realistic timeline for your first measurable improvements. Waqas Ahmed

@arslanshahid386

Hi, I can help you with this project. I have relevant experience with PHP and can handle the work from development to testing and delivery. I've reviewed your requirements and can provide a clean, reliable, and responsive solution. Let's discuss the details and get started. Best, Arslan Shahid

@aptechzain1

Hi! I can build the offline POS with .NET/C# and local database sync for Windows or Android tablets. Should the manual protocol 201.3 flow be fully automated or only logged for later reconciliation? I’ll keep inventory, customer profiles, reports, and manual receipt handling reliable offline. Best regards. Portfolio:

@shayankhan333

Hello, I will build your offline POS for minerals, transport, and machinery rentals, queuing sales locally on Windows or Android and syncing automatically when connectivity returns. It will cover inventory, customer profiles, filtered reports, and manual entries via protocol 201.3. I can start today. For offline storage I will use SQLite with a conflict-safe sync queue, so field entries reconcile cleanly once online. Questions: 1) Windows laptops, Android tablets, or both? 2) Should sync go to your own server or a cloud database? Looking forward to discussing further. Regards, Shayan.

@pasion0128

★•══•★ Hi client ★•══•★ I’d build a solid POS app that works offline on Windows laptops and Android tablets, storing transactions locally and syncing automatically when the internet’s back—no more lost sales in remote areas. Inventory and customer management will be smooth, letting your teams update stock and profiles on the fly. For offline data, I’d use a local database (like SQLite) with smart sync logic to handle conflicts gracefully. Sales reports will be filterable by date, location, service type, or staff member for easy insights. The manual transaction feature will follow protocol 201.3 or a reliable alternative so handwritten receipts won’t be a headache. I’ve worked on similar offline-first apps ensuring stability and ease of use for field teams. Clear setup guides and clean code documentation are part of the package so you can take over maintenance anytime. What’s your preferred tech stack, or should I suggest one based on your environment? Best regards, Rico

@shawanay

Internet disruptions can lead to lost sales. A reliable POS system that operates fully offline is essential. I propose developing a system equipped for inventory and customer management, with comprehensive sales reporting and manual transaction options, guaranteeing sales continuation and operational efficiency even offline. With five years of experience as a Full Stack Developer, I have successfully built systems that address such challenges and prevent sales interruptions. Consistent, quality delivery on projects is my focus. To tailor the solution to your needs, we should decide on the platform: web-based, desktop, or mobile. What is your preferred platform for the POS system?

@ammarahmed20

As an experienced full-stack developer with a focus on mobile app development and PHP expertise, I possess the necessary skills to build you a reliable offline POS system. Acknowledging that your field teams often face challenging situations in remote areas with unreliable connectivity, I will leverage my technical know-how to create a solution that not only breaths flexibility in terms of web, desktop or mobile usage but also operates seamlessly on Windows laptops and Android tablets. In order to achieve robust offline workflows, I'll implement an efficient local data store and syncing logic that will automatically sync all transactions once a connection is reestablished. My vast experience in creating seamless real-time and autonomous systems can be seen through projects such as AI voice receptionist for booking calls into GHL or implementing LOADEX freight sales automation on n8n and Supabase. Once the installable POS application is up and running, my commitment doesn't stop there. I'll provide you timely and clear setup instructions along with a comprehensive user guide specifically made for your field teams. Additionally, I'll provide you the source code or documented build process so that you can maintain the system effortlessly internally. Rest assured, choosing me for this mission-critical project guarantees you practicality, adaptability, and long-term efficacy for your service-based company needs.

@longngoc2307

Hi - Truong here "FULLY OFFLINE POS WITH AUTO SYNC" — you need field sales to keep working even when connectivity disappears. I’d use a local SQLite store on the device, queue every transaction with a sync status, then reconcile changes automatically when the connection returns. The key edge case is interrupted syncing, so transactions need unique IDs and safe retry logic to prevent duplicates. I’d structure inventory, customers and reporting around your minerals, transport and equipment-rental workflows rather than a generic retail POS, while keeping it usable on Windows and Android. Which device will field teams use most often: Windows laptops or Android tablets? Looking forward to working with you.

@Proswift

Hi, You need a field POS for minerals, transport, and machinery rental that keeps working offline: queue sales, sync when the network returns, plus inventory, customers, filtered reports, and a way to log handwritten receipts (protocol 201.3 or equivalent) for later reconcile. Stack: native Android (Kotlin) on tablets, with a Windows-friendly option if needed. Offline: local SQLite as source of truth; each sale/customer/stock change queued with a unique id; auto-sync over REST when online, with conflict rules so nothing is dropped. I’ve shipped a distributor app with local SQLite, offline orders, SKU stock, and customer/store records that sync when connectivity returns — same pattern as remote field teams. Price: $100 Timeline: ~2–3 weeks for v1 (offline sales, inventory, customers, reports, receipt reconcile + user guide). If you have the 201.3 spec, I’ll match it; otherwise a receipt number + photo/log that reconciles on sync. Best regards

@ayesha86664

Hi there! Field sales should not stop because the internet is unstable. You need a POS that works reliably offline, stores every transaction safely, and syncs without creating duplicate or missing records when the connection returns. I have experience building business applications with C#, .NET, PHP, mobile apps, database systems, and offline-first workflows. I understand the need for inventory, customer management, field sales, reporting, and reliable synchronization for remote teams. I would prefer a .NET based solution with a local SQLite database for offline storage and a secure API for automatic synchronization. Transactions will be queued locally, synced when connectivity returns, and handled with conflict and duplicate protection. I will also include manual transaction support, filters, setup documentation, and a simple interface for Windows laptops and Android tablets. check our work https://www.freelancer.com/u/ayesha86664 Do you already have an existing database or system that the new POS needs to integrate with? Let me know if you’re interested & we can discuss it. Best Regards Ayesha

@umer419

Hello, I checked your project "Functional Offline POS System" and already have a clear understanding of your requirements and how to deliver them efficiently. I have solid experience in PHP, Mobile App Development, and I've successfully completed similar projects by delivering high-quality, scalable, and reliable solutions. Why choose me? * Strong expertise in PHP, Mobile App Development * Clean, optimized, and scalable implementation * Fast communication and regular progress updates * Focused on delivering results, not just completing the task I'm ready to start immediately and would be happy to discuss the details. Best regards, Umer

@lazarr4

Hello, the first thing that stands out here is the offline sync logic—if the queue grows too large or the connection stays down for days, you risk data loss or performance hits when syncing back to the main system. I’ve built a few offline-first apps for field services where the core challenge was keeping the local store in sync with a cloud backend without blocking the UI. One project used SQLite for the local cache and a background worker to handle retries and conflict resolution when the connection returned. I’d go with a web-based stack using React for the frontend, Node.js with Express for the API, and SQLite wrapped in a service worker to handle the offline queue and automatic sync. The local database would mirror the schema of the main system, with timestamps and status flags to track unsynced records. For the 201.3 protocol, we can implement a simple CLI tool or a dedicated UI button to flag transactions as "manual" with a note field for reconciliation. One unknown is whether you already have a main system the POS should sync with or if we need to design the backend schema from scratch. If the latter, we’ll need to align on the data model early. Thanks, Lazar.

@azwa04

The key challenge is making the POS genuinely offline rather than simply caching the interface. I’d use a local-first database on the Windows/Android client so sales, inventory and customer updates continue without connectivity, queue every transaction with a unique ID, and automatically sync/reconcile with the central database once the connection returns. I’d structure inventory and sales around minerals, spare parts, equipment and services, with reports filterable by date, location, service and staff. I’d also isolate the manual receipt/Protocol 201.3 flow so offline transactions can be reconciled safely without creating duplicates. I’d test the critical scenario by disconnecting the device completely, processing transactions, restarting the app, reconnecting, and verifying that every queued transaction syncs correctly.

@engruhulajom

Hello Dear! Good Day! Hope you are doing fine. This is Ruhul Ajom Sagor. I am an expert "Web Developer" with 10+ years of working experience in PHP, HTML5, CSS3, JavaScript, jQuery, Bootstrap, MySql and different Frameworks. I have completed my B.S.C Engineering in Computer Science and Engineering (CSE) from BUET. Hire me and you don't have to worry about your website problems again! I'll add value to your projects by creating astonishing designs and code with high impact and optimized user interaction that leads to bigger conversions. WHAT PROBLEMS CAN I HELP YOU SOLVE? • Custom Websites Using PHP and Frameworks • e-Commerce Websites (Woo-Commerce and Shopify) • Custom WordPress themes • On-Page and Off-Page SEO • WordPress themes Customization • Database Modeling/Development • WordPress migrations and upgrades • Responsive Coding (Make your website compatible with: smartphones, tablets, desktops) • Websites speed and loading time improvements • Cross-browser compatibility • PSD to HTML to WordPress conversion • HTML5/CSS3/jQuery websites based on Bootstrap I love challenges, talking to my clients, and meeting others’ standards as well as expectations. I will be discussing everything in detail, giving my full advice and delivering through best of my skills. You are cordially welcome to discuss your project. Thank You! Best Regards, Ruhul Ajom