Senior Dev for POS & Financial Reconciliation SaaS

@vishal1145

ReconFlow Your offline-first architecture will fail if you don't implement a conflict resolution strategy for when two branches modify the same cash register entry during network outages. I've seen this break reconciliation for 3 restaurant chains - transactions get duplicated or lost during sync, causing audit nightmares. Before architecting this, I need clarity on two things: What's your expected transaction volume per location during peak hours? And are you planning to support partial syncs or full database replication when connectivity returns? Here's the architectural approach: - FLUTTER + SQLITE: Build local-first POS with Hive for encrypted offline storage, implementing CRDT-based conflict resolution to prevent duplicate transactions during multi-device sync. - NODE.JS + POSTGRESQL: Design event-sourced backend where every transaction is immutable, enabling full audit trails and time-travel reconciliation when discrepancies occur. - AWS APPSYNC + DYNAMODB: Handle real-time sync with automatic retry queues and idempotency keys to prevent duplicate payments when network flickers during checkout. - PAYMENT RECONCILIATION: Build a matching engine that correlates POS receipts with bank settlements using fuzzy matching algorithms - I've reduced manual reconciliation time by 80% for 2 fintech clients. - NOSQL STRATEGY: Use MongoDB for flexible receipt schemas across different POS vendors, with PostgreSQL for financial ledgers requiring ACID compliance. I've built 2 offline-first fintech systems that processed $50M+ in transactions. I don't take on projects where data consistency isn't bulletproof. Let's discuss edge cases like network partitions and concurrent cash drawer access before committing to an MVP timeline.

@devsrank

Hello, We went through your project description and it seems like our team is a great fit for this job. We are an expert team which have many years of experience on NoSQL Couch & Mongo, Amazon Web Services, Node.js, PostgreSQL, SQLite, AngularJS, Flutter, SaaS Lets connect in chat so that We discuss further. Thank You

@TechizeBuilder

Hi! I'm a MERN Stack expert specializing in NoSQL Couch & Mongo, Amazon Web Services, Node.js, PostgreSQL, SQLite, AngularJS, Flutter. I've carefully read your Senior Dev for POS & Financial Reconciliation SaaS and fully understand the requirements — I'm confident I can deliver clean, scalable, and high-performance code on time. I'd love to discuss the details further and get started right away. Let's connect to make your project a success!

@fullstack0407

ReconFlow I have read your job post and I am a Full Stack Developer with experience building SaaS platforms, POS systems, ERP solutions, payment integrations, and multi-location business management software. I have worked on POS, inventory, CRM, and financial applications involving transaction tracking, reporting, user roles, audit logs, and real-time synchronization. I also have experience with Flutter, Node.js, PostgreSQL, REST APIs, and cloud deployments. For this MVP, I would recommend Flutter for the POS application, SQLite for offline operation, Node.js/NestJS for backend services, PostgreSQL for central data storage, and AWS for hosting and scalability. The system can support offline transactions, automatic synchronization, reconciliation workflows, discrepancy detection, branch management, and reporting dashboards while remaining scalable for future growth. Have you already defined the reconciliation rules and settlement workflows, or should those be designed during the architecture phase? Will the MVP integrate with specific payment providers or bank APIs initially?

@ambientinfotech

Hi, I can help you build a high-quality Flutter mobile application with clean UI/UX, fast performance, and scalable architecture. I have strong experience in Flutter app development, API integration, Firebase, custom backend systems, ERP/CRM integration, and eCommerce/mobile solutions. ✅ Cross-platform Android & iOS apps ✅ Clean and responsive UI/UX ✅ API & payment gateway integration ✅ Admin panel & backend support ✅ Fast communication & on-time delivery ✅ Long-term maintenance support I focus on delivering stable, user-friendly, and production-ready applications with complete client satisfaction. Let’s connect and discuss your project requirements in detail. Thanks,

@ParasTech7

I’m a Principal Software Engineer with 21+ years of experience building enterprise SaaS, POS, financial, and distributed systems. POS Experience: Yes. Currently building a Warehouse Management System with sales, inventory, purchasing, reporting, and multi-branch support. Offline-First Apps: Yes. Experienced with SQLite-based local storage, sync engines, conflict resolution, and auto-sync on reconnect. Payments/Reconciliation: Yes. Worked on transaction processing, financial reporting, audit trails, and reconciliation workflows. Recommended Stack: • Flutter • NestJS / Node.js • PostgreSQL • SQLite • AWS • Event-driven offline-first architecture . MVP Timeline: 8–10 weeks for a production-ready MVP. I can help define the architecture, not just write code, and would be happy to discuss the reconciliation workflows in detail.

@nitinjohnson316

ReconFlow Hi, I am a Full Stack Developer with 14+ years of experience building web applications, SaaS platforms, POS systems, and business management software. My experience includes: • POS and inventory management systems • Multi-branch business applications • Payment gateway integrations • Offline and online data synchronization • Laravel, Node.js, Flutter, PostgreSQL, MySQL, and AWS • SaaS architecture and MVP development Answers: 1. Yes, I have worked on POS, inventory, and business management systems. 2. Yes, I have experience with offline data storage and sync solutions. 3. Yes, I have worked with payment gateways, transaction tracking, and financial reporting. 4. I recommend Flutter, Node.js/NestJS, PostgreSQL, SQLite, and AWS. 5. MVP timeline: approximately 8–12 weeks depending on final requirements. I can help with architecture planning, database design, development, testing, and deployment. I can complete work quickly with good quality and long-term support.

@gauravl3

ReconFlow! I am Gaurav and my team and I are your go-to solution for creating cutting-edge, scalable software tailored specifically to meet your unique business needs. Our extensive experience in Full-Stack Development, specializing in Flutter and Node.js - the key technologies you're looking for, will enable us to bring your POS & Financial Reconciliation SaaS vision to life with remarkable precision. To be specific, we have successfully built POS systems and efficient offline-first applications that reliably sync data as soon as the internet is restored, thus completely aligning with your project objectives. Additionally, our familiarity with payment and reconciliation systems will add extra value to the development of this critical aspect of your SaaS platform. In terms of tech-stack and architecture, I recommend using a combination of Flutter, Node.js with NestJS, PostgreSQL and SQLite on AWS for centralized data management and security. This well-refined stack ensures high-performance while also keeping future scalability in perspective. With our wealth of experience in fintech applications and multi-location retail systems combined with your vision, we can promise an MVP delivery within a realistic timeline that doesn't compromise on quality.

@raj00565

With 12+ years of experience in POS systems, SaaS platforms, and backend development, I can help build a reliable offline-first solution for retail and restaurant operations. My expertise includes Node.js, Flutter, PostgreSQL, SQLite, AWS, payment integrations, and financial reconciliation systems. I focus on delivering scalable, secure, and maintainable applications that ensure smooth operations even with limited connectivity.

@kunalkakkad

ReconFlow We can help define the architecture and build your offline-first POS and financial reconciliation SaaS MVP for retail and restaurant businesses. Yes, we have experience with POS-style workflows, inventory/order systems, multi-user dashboards, payment tracking, audit logs, APIs, and SaaS platforms. We have also worked on offline-capable mobile apps where local data is stored and synced once connectivity returns. For this MVP, I’d recommend: Flutter for POS/mobile apps SQLite for offline local storage Node.js/NestJS for backend APIs PostgreSQL for central cloud database AWS for hosting, storage, queues, backups, and scaling Architecture would include local-first transaction capture, background sync, conflict handling, branch-wise dashboards, user roles, audit logs, and reconciliation logic comparing POS sales, cash collections, digital payments, and bank settlements. MVP modules: 1. Offline POS transaction flow 2. Auto-sync and retry queue 3. Cash register and payment tracking 4. Multi-branch dashboard 5. Bank settlement import/reconciliation 6. Discrepancy reports and audit logs Estimated MVP timeline: 10–14 weeks, depending on reconciliation rules, payment sources, and reporting depth. A few questions: 1. Which POS/payment providers need integration first? 2. Will bank settlement data come from API, CSV, or manual upload? 3. Do you need restaurant table/order features in MVP? Let’s define the reconciliation workflow and build a stable MVP architecture.

@Menaga3777

As a passionate and versatile Full-Stack developer, my understanding of your project's scope and intricacies resonates deeply with my professional experience. My proficiency in the skills you've outlined such as Flutter and Node.js allows me to confidently state that I am well-equipped to materialize your SaaS platform vision for financial reconciliation. The expertise I bring encompasses a diverse range of domains including POS systems, payment, and fintech, which aligns excellently with your project requirements. Speaking to relevant experience, I've recently built a highly efficient Point of Sale system for a leading retail chain with multiple branches. This involved integrating smart reconciliation features for transactions data while providing real-time cash flow analysis over different bank accounts. Moreover, I have hands-on experience deploying seamless offline-first applications - crucial for uninterrupted operations especially in retail environments. Regarding the tech stack and architecture, given the nature of your project, I would invoke the benefits provided by AWS cloud platforms for its security, scalability, and flexibility. Pairing it with Flutter's smooth UI/UX capabilities under Node.js/NestJS.io framework for the backend interactions paired with PostgreSQL or SQLite database management would be my recommended solution for this endeavor.

@fizaa170

ReconFlow Hi, This project aligns well with my experience building ERP, POS, inventory, and business management systems. I can contribute not only as a developer but also in defining a scalable architecture for an offline-first reconciliation platform. ✔ Offline-First POS (SQLite + Sync Engine) ✔ Flutter Cross-Platform App ✔ NestJS APIs ✔ PostgreSQL Multi-Tenant Database ✔ Sales, Cash & Digital Payment Tracking ✔ Bank Settlement Reconciliation ✔ Discrepancy Detection Engine ✔ Multi-Branch Dashboard ✔ Role-Based Access Control ✔ Audit Logs & Activity Tracking Recommended Architecture Flutter (POS) → SQLite Offline Storage → Sync Service → NestJS APIs → PostgreSQL → Analytics & Reconciliation Engine Answers Yes, I have worked on POS, ERP, inventory, and retail management systems. Yes, including local database sync, conflict handling, and offline-first workflows. Yes, payment tracking, settlement workflows, financial reporting, and reconciliation logic. Flutter + NestJS + PostgreSQL + SQLite + AWS is my recommendation for scalability and maintainability. MVP timeline: 8–12 weeks depending on reconciliation complexity and reporting requirements. One important question: Will bank settlement reconciliation be based on uploaded bank statements (CSV/Excel) in Phase 1, or do you require direct bank/payment gateway integrations from the MVP stage?

@jagratip3

I have experience building POS, SaaS, and offline-first business applications and can help architect and develop your MVP. My recommended stack is Flutter (POS/Admin), NestJS (API), PostgreSQL (cloud), and SQLite (offline local storage) with a sync engine for automatic recovery when connectivity returns. ✔ Offline-first POS with auto-sync ✔ Multi-branch management & role-based access ✔ Payment tracking, reconciliation, and discrepancy reporting ✔ Audit logs and secure SaaS architecture

@mehta2010

I have worked on a comprehensive pos application built using csharp wpf mvvm. It has offline working ability using local sql db and a sync architecture which runs periodically using guids and data syncing. It also has offline wallet functionality which takes care of lot of scenarios like wrong wallet balance on difference pos terminals, please reply to my bid and i will discuss more and send you screenshots of my work

@tamannarajput18

ReconFlow: As a senior Full-stack developer, my skills align perfectly with your project requirements for building a SaaS platform. To start, I have extensive experience in POS systems and have previously developed offline-first applications that perfectly align with the vision you have for automating financial reconciliation between multiple channels. Moreover, I can underscore my solid understanding of Point-of-Sale functionalities specific to the retail and restaurant sector from my previous projects. In terms of payment and reconciliation systems, I have successfully developed solutions with NestJS, PostgreSQL and SQLite that expedite the process and minimize discrepancies. Additionally, integrating this architecture onto AWS or similar cloud platforms like you prefer would give us excellent scalability, reducing development time and enhancing performance. Regarding the timeline estimation for an MVP, it's imperative we sufficiently discuss your specific requirements before setting any fixed time frame.

@souvikbasu

ReconFlow Hi, I'm a senior full-stack developer with SaaS, fintech, and offline-first experience. 1. POS: Built billing + inventory systems with barcode scanning, cash/card split payments, and end-of-day reconciliation reports. 2. Offline-first: Used SQLite with sync queues and conflict resolution (last-write-wins + manual override flag) — exactly this pattern. 3. Payments/reconciliation: Integrated Razorpay & Stripe, built bank settlement matching via transaction ID cross-referencing and discrepancy flagging. 4. Stack recommendation: Flutter + SQLite (offline POS client), NestJS + PostgreSQL (cloud backend), AWS SQS for sync queue. Event-sourcing pattern for offline ops ensures zero data loss on reconnect. 5. MVP timeline: 6–7 weeks — Weeks 1–2: Auth + POS core + offline SQLite; Weeks 3–4: sync engine + payment tracking; Weeks 5–6: reconciliation dashboard + discrepancy reporting; Week 7: multi-branch + QA. Are you targeting Android POS tablets, desktop, or both? Happy to jump on a call to define the architecture.

@sora0218

Hello Mate!Greetings , Good morning! I’ve carefully checked your requirements and really interested in this job. I’m full stack node.js developer working at large-scale apps as a lead developer with U.S. and European teams. I’m offering best quality and highest performance at lowest price. I can complete your project on time and your will experience great satisfaction with me. I’m well versed in React/Redux, Angular JS, Node JS, Ruby on Rails, html/css as well as javascript and jquery. I have rich experienced in SQLite, Amazon Web Services, PostgreSQL, AngularJS, SaaS, NoSQL Couch & Mongo, Flutter and Node.js. For more information about me, please refer to my portfolios. I’m ready to discuss your project and start immediately. Looking forward to hearing you back and discussing all details.. Please respond at your earliest convenience

@ammarahmed20

ReconFlow! With six years of experience under my belt, I've successfully delivered on projects that have demanded meticulous financial tracking, such as SaaS products for the retail and healthcare industries. This has given me invaluable insights into complex domains involving payment systems, bank reconciliation, and multi-location management. Coming from a SaaS background, I understand the importance of building a solution that not only meets objectives but also provides a seamless user experience across all devices regardless of poor or no internet connectivity. For your project, I propose employing Flutter for smooth cross-platform functionality and Node.js paired with NestJS for robust backend architecture. These tech stacks along with deploying on AWS or a similar cloud platform guarantee high scalability, superior performance, and reliable offline-first operation. Regarding timeline, I estimate completing the MVP within three to four months considering the intricacies involved in an end-to-end financial system like this.

@dushyant317

ReconFlow — I can help architect and build your offline-first POS and reconciliation SaaS using Flutter + NestJS + PostgreSQL/SQLite with sync mechanisms, audit trails, multi-branch support, and payment reconciliation workflows designed for scalable retail and restaurant operations.