STRIPE CONNECT | STRIPE BILLING | STRIPE RADAR | STRIPE API | STRIPE CHECKOUT | STRIPE TERMINAL | FINTECH | SAAS | AI | PAYMENTS | COMPLIANCE (PCI DSS, GDPR) If Stripe is slowing down your product, breaking your billing logic, or causing failed payments you can’t explain, I can fix that. I’ve delivered 100+ Stripe integrations for SaaS and tech companies, and I’m a 4× Stripe Certified professional. You’re not getting a basic integration, you’re getting a payments system designed to reduce churn, recover revenue, and scale with your growth. I specialize in building Stripe systems that directly impact metrics like churn, AOV (Average Order Value), LTV, and checkout conversion rates. I don’t just plug APIs. I step into your architecture and make sure your billing, subscriptions, and payment flows are optimized end-to-end. I can help if you’re dealing with: 🔹 High checkout abandonment rates 🔹 Unexpected churn from failed payments or poor retry logic 🔹 Broken or confusing subscription upgrades/downgrades 🔹 Low AOV due to poor pricing or payment flow design 🔹 Inconsistent or unreliable webhook handling 🔹 Stripe setups that “work” but don’t scale What I can help you with: 🔹 End-to-end Stripe integration for SaaS platforms 🔹 Subscription architecture (plans, trials, proration, lifecycle logic) 🔹 Reducing churn with smarter retry logic and dunning strategies 🔹 Checkout optimization to improve conversion rates 🔹 Webhook architecture (reliable, scalable, no missed events) 🔹 Stripe account audits with revenue-focused insights 🔹 Advanced Stripe products (Connect, Sigma, custom workflows) If you already have developers, I can work directly with them or guide them through the correct architecture in live sessions. Most Stripe implementations leave money on the table. I help you close those gaps so your payments system actually drives revenue, not just processes it. If you want to improve conversion, reduce churn, or fix hidden issues in your Stripe setup, send me a message and let’s take a look.

React Native & Flutter Mobile App Developer specializing in 𝗔𝗡𝗗𝗥𝗢𝗜𝗗 & 𝗜𝗢𝗦 𝗔𝗣𝗣𝗦 ✅ Rewarded as 🏆 𝗧𝗢𝗣 𝗥𝗔𝗧𝗘𝗗 🏆 by Upwork (𝗧𝗢𝗣 3%) ✅ 4696+ 𝗛𝗢𝗨𝗥𝗦 and still counting ✅ 122+ 𝗝𝗢𝗕𝗦 𝗖𝗢𝗠𝗣𝗟𝗘𝗧𝗘𝗗 𝗦𝗨𝗖𝗖𝗘𝗦𝗦𝗙𝗨𝗟𝗟𝗬 ✅ 100% 𝗝𝗢𝗕 𝗦𝗨𝗖𝗖𝗘𝗦𝗦 𝗦𝗖𝗢𝗥𝗘 (Client Satisfaction Ratio) ✅ 𝗛𝗜𝗚𝗛-𝗤𝗨𝗔𝗟𝗜𝗧𝗬 𝗪𝗢𝗥𝗞 ✅ 𝗕𝗨𝗗𝗚𝗘𝗧-𝗙𝗥𝗜𝗘𝗡𝗗𝗟𝗬 ✅ 𝗙𝗟𝗨𝗘𝗡𝗧 𝗘𝗡𝗚𝗟𝗜𝗦𝗛 𝐆𝐫𝐞𝐞𝐭𝐢𝐧𝐠𝐬, I'm Muhammad Jabbar, a Senior iOS/Android Mobile app and Full Stack MERN Developer with over 15+ yrs of hands-on experience in building robust mobile and web applications. My expertise spans various technologies, allowing me to deliver high-quality, scalable solutions that drive success. I’ve worked with a diverse range of clients to bring their visions to life using the latest tech stacks. ✳️ 𝐒𝐄𝐑𝐕𝐈𝐂𝐄𝐒 𝐈𝐍𝐂𝐋𝐔𝐃𝐄𝐃 𝐈𝐍 MOBILE APP DEVELOPMENT: ✔ 𝐌𝐨𝐛𝐢𝐥𝐞 𝐀𝐩𝐩 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: React Native, Flutter, Swift, Java ✔ 𝐅𝐫𝐨𝐧𝐭-𝐞𝐧𝐝: React.js, JavaScript (ES6+), HTML5, CSS3, Figma to React, Next.js, TypeScript ✔ 𝐁𝐚𝐜𝐤-𝐞𝐧𝐝: Node.js, Express.js, REST API, MongoDB, Laravel, PHP API ✔ 𝐃𝐞𝐯𝐎𝐩𝐬 & 𝐂𝐥𝐨𝐮𝐝: AWS, Realtime Systems, Docker, Vercel, Netlify, Firebase ✔ 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞: MongoDB, MySQL, PostgreSQL ✔ 𝐀𝐈 & 𝐀𝐏𝐈𝐬: OpenAI, AWS, Google APIs, Stripe, Twilio, SendGrid, OneSignal ✔ 𝐀𝐈-𝐂𝐨𝐝𝐢𝐧𝐠 𝐓𝐨𝐨𝐥𝐬: Lovable, Claude Code, Google Firebase Studio, ChatGPT, Cursor 🏆 𝗧𝗢𝗣 𝗣𝗥𝗢𝗝𝗘𝗖𝗧: 𝗟𝗔 𝗠𝗢𝗩𝗜𝗡𝗚 𝗦𝗧𝗔𝗥 (𝗨𝗦𝗔) One of my top projects is LA Moving Star, a US-based moving services marketplace platform built for Los Angeles. This system connects customers and moving companies through a complete multi-module solution including: ✅ Client/Customer App (post moving job, budget, tracking, payments) ✅ Company App (job bidding, crew assignment, communication) ✅ Foreman App (start move, live location tracking, job completion) ✅ Sales Team App (job insights and status monitoring) ✅ Admin Panel (analytics dashboard + agreement document management) Key features included: 🔥 Job posting + bidding system 🔥 In-app chat 🔥 Real-time crew tracking 🔥 Secure payment workflow 🔥 Ratings & reviews system 🔥 Full admin analytics & reporting 💬 𝗖𝗟𝗜𝗘𝗡𝗧 𝗥𝗘𝗩𝗜𝗘𝗪 (𝗥𝗘𝗔𝗟 𝗙𝗘𝗘𝗗𝗕𝗔𝗖𝗞) ⭐⭐⭐⭐⭐ "Muhammad and his team were very good partners in developing our app which had a lot of moving parts. I have never built an app and am not a coder. I knew what I wanted to build from a business perspective and the team was very patient working with me to shape the process and make sure that the user experience would be very good." ⭐ 𝗪𝗛𝗬 𝗠𝗘? ✅ WEEKLY REPORTS + CLEAR COMMUNICATION ✅ SPRINT-BASED DELIVERY + MILESTONE PLANNING ✅ FIXED-PRICE OR HOURLY CONTRACTS (flexible) ✅ CLEAN ARCHITECTURE + REUSABLE COMPONENTS ✅ FULL TRANSPARENCY, NDA, AGILE METHODOLOGY 💥 NO MORE TALK! LET'S START BUILDING! Need your app delivered FAST & PROFESSIONALLY? DROP ME A MESSAGE AND LET’S BEGIN TODAY. ✳️ 𝐊𝐄𝐘𝐖𝐎𝐑𝐃𝐒 𝐓𝐎 𝐅𝐈𝐍𝐃 𝐌𝐘 𝐒𝐄𝐑𝐕𝐈𝐂𝐄𝐒: | Flutter Developer | Flutter App Developer | Android App Developer | iOS App Developer | Cross Platform Mobile Developer | Mobile App Development | AI Mobile App Developer | Artificial Intelligence App Development | Machine Learning App Integration | Firebase App Developer | API Integration Flutter | Hybrid App Developer | AI Solutions for Mobile Apps | AI App Developer | Mobile App Developer | Senior Mobile App Developer | Dating App Development | Flutter Mobile App Development | Education App Developer | Saloon Booking Mobile App Development | Dating Mobile App Development | Food Delivery Mobile App Development | AI App Development | Chat Mobile App Developer | Chat Buddy Mobile App Development | iPhone App Development | Android Mobile App Development | Android App Development | Cross Platform Mobile Development | Cross Platform Development | AI Mobile App Developer | Flutter Mobile App Firebase | Flutter Developer | Flutter Mobile App | Mobile App Developer | Mobile App Development | Flutter Laravel | Flutter Mobile App Developer | Mobile App Builder | React Native Mobile App Development | React Native Mobile App Developer | Mobile Developer | Mobile App Developer | Flutter Mobile App Developer | Flutter Mobile App Dart | Flutter Mobile App Firebase | Flutter Mobile App Developer | Flutter Mobile App | Mobile App Developer | Mobile App Development | Mobile App Redesign

1% Top Rated software engineer on Upwork, 5+ years of building complex systems from scratch and shipping software for companies like ABB, Telekom and various institutes. Startups and businesses hire me to design, build, and launch real products, not prototypes, that are ready to grow, scale smoothly, and meet professional standards from day one. Expertise: MVP Development (idea to production) Dashboards, workflows, secure portals, state-driven components, edge functions Postgres schema design, RLS policies, authentication, storage, triggers, pgvector for AI-ready features Taking MVPs to the next level with more robust architectures, including cloud-based backends (AWS) when products outgrow early-stage setups SaaS platforms, client portals, marketplaces, and internal tools Automation, n8n workflows, API integrations, webhooks, async jobs, and resilient pipelines AI integration, chatbots, RAG I don’t over-engineer, I don't sit on calls all day and I don’t waste time - I build software that’s fast, maintainable, and lasts - and I make sure it stays that way. If you are looking for a partner to design, build, and evolve your next MVP or web application, let’s connect.

✨ Top-Rated Full-Stack Java Developer | React/Angular | AWS 🚀 I build production-grade web apps with Java Spring Boot backends and React or Angular frontends. My focus is clean architecture, reliable APIs, and fast, usable UIs. I have delivered products in fintech, healthcare, logistics, and SaaS with payments, subscriptions, RBAC, audit trails, reporting, and real-time dashboards. I deploy on AWS with CI/CD. 🧩 What I Do 💹 Back-end: Java, Spring Boot, REST APIs, Microservices, Hibernate or JPA, OAuth2 or JWT, caching, queues 💹Front-end: React, Angular, TypeScript, Material or Ant, Redux or NgRx, responsive UI, accessibility 💹 Cloud and DevOps: AWS EC2, S3, RDS, Lambda, Docker, CI/CD, monitoring, cost control 💹 Data and Integrations: PostgreSQL, MySQL, Redis, webhooks, payment processors, third-party APIs 💹 Quality and Security: Unit and integration tests, code reviews, performance tuning, secure coding 🏆 Selected Wins • Built a payments and settlements engine with ledger, refunds, disputes, webhooks, and reports • Shipped a logistics load board with real-time tracking, bids, and document workflows • Delivered a health portal with secure messaging, scheduling, and HIPAA-aligned controls • Created operations analytics dashboards with drill-downs, alerts, and CSV or PDF exports 🔧 Services • Full-stack feature development and refactors using Java with React or Angular • API and microservices design, integrations, and webhooks • Cloud deployment on AWS, CI/CD, and observability • UI modernization with component libraries, state management, and performance tuning 🗂️ Tech Snapshot • Back-end: Java, Spring Boot, Hibernate, JDBC, OAuth2, JWT • Front-end: React, Angular, TypeScript, Redux, NgRx, Material, Ant • Cloud: AWS EC2, S3, RDS, Lambda, Docker, GitHub Actions, Jenkins • Data: PostgreSQL, MySQL, Redis, exports to CSV or PDF or JSON • Tooling: Git, Maven, Gradle, Postman, JUnit, Mockito If you want a reliable full-stack partner who can own a module end to end, design, build, test, and ship, let’s connect. 🙂

Hi, I’m Abdul K— a Full-Stack Developer with 15+ years of hands-on experience delivering modern, scalable, and high-performing web solutions. Over the years, I’ve successfully built and deployed a wide range of applications — from SaaS platforms and AI-driven tools to custom e-commerce and enterprise systems. My goal is to turn ideas into reliable, business-ready products that drive results. Services I Offer ✅ SaaS Application Development ✅ AI Integration & Automation ✅ Custom Web App Development ✅ Database Design & Architecture ✅ Performance Optimization ✅ E-commerce Solutions ✅ API Development & Documentation ✅ System Migration & Deployment ✅ Landing Page & Company Website Design ✅ Server Setup & Maintenance Technical Expertise ✅ Django | Node.js | Express.js | Python | ASP.NET ✅ React.js | Next.js | Tailwind CSS | Bootstrap ✅ PostgreSQL | MongoDB ✅ Docker | Kubernetes | CI/CD | YAML ✅ RESTful APIs | Git & GitHub Why Work with Me ✔️ Comprehensive Expertise: With a strong background in AI, full-stack development, and cloud technologies, I bring the versatility needed to craft efficient, high-quality solutions. ✔️ Clear Communication: I maintain consistent communication and provide transparent progress updates throughout every stage of the project. ✔️ Deadline-Driven: I’m committed to delivering exceptional results on time and within budget—turning your ideas into reality with precision and reliability. Whether you’re looking for a reliable developer to build something from the ground up or improve an existing system, I’m here to help. Let’s connect and bring your next project to life!

✅ Top rated by Upwork ✅ 5+ years of experience ✅Get your urgent tasks done within 24 hours I'm a Python expert with 5+ years of Industry experience in websites data scraping, bot development and browser automation. • Ability to scrape job boarding, yellow pages, classified, LinkedIn, and e-commerce websites. • Ability to crawl javascript loading, IP blocking, Rate limit, and captcha protection websites. Ability to scrape job board websites including LinkedIn, Indeed, Wellfound, Glassdoor etc. • Ability to scrape from PDF documents too. • Ability to crawl 1M+ records per day. • Ability to scrape mobile app data too. • I will be available 24/7 for support. • Feel free to contact me if you have any available work ;) Perks: • No need to hire or pay before the job is completed satisfactorily. • 100% client satisfaction. • Responsible for back-and-forth changes. • Script can be delivered in case it is required. • Fast and accurate data • Deliverables are available in all popular formats (JSON, CSV, EXCEL, XML, SQL) • Frequent updates about the current progress • Can set up in client system irrespective of OS environment. Range of tasks: • Android Apps, Windows Apps scraping. • Web scraping, crawling, parsing, and data extraction & browser automation. • Bypass any captchas(Cloudflare Captcha, Recaptcha) to prevent IP blocking and bot detection. • PDF Extraction along with OCR techniques Skills • Python, Java, Javascript • Requests, Selenium, Beautiful Soup, Scrapy, Pupeeter, LXML • PDF Parsing, Conversion from PDF to EXCEL • ORACLE, MYSQL, Advanced Database Skills. I hope to hear from you soon.

I am a tech enthusiast and Software Engineer with over 7 years of experience across several fields. Front-end experience: Flutter (mobile, web) Back-end experience: Python, Firebase, Java, Node.js, C#, Ruby on Rails AI experience: I have hands-on experience building apps that integrate AI capabilities—leveraging machine learning, natural language processing, and generative models to deliver smarter, more adaptive user experiences. I am the co-founder of a Flutter agency, SmartUp Software, where we provide custom software development and staff augmentation services. We've successfully developed and deployed 20+ mobile and web applications. I also developed an award-winning social project called Berrinche, aimed at helping parents and therapists of children with ASD identify the causes of disruptive behaviors and discover effective ways to manage them.

I'm a System Engineer turned into CEO. I lead a team of 150 awesome talented persons, including Developers, Creative, UX designers and QA Analysts. We love what we do and have lot of fun doing it. During the past 15 years we have been part of different kind of projects, from top notch concept technologies projects to big corporate systems. Some of our achievements - TOP 2 oDesk Agencies. - 56000+ hours logged (28+ man years !!) - 5 star rating - 100+ projects successfully done - Innovation Award 2012 - Our customers love us and we love them

I help companies build, extend, and troubleshoot production Java backends using Spring Boot, REST APIs, secure integrations, and relational databases. Since 2021, I have worked on financial platforms, electronic invoicing, open banking, social applications, commercial JDK automation, and JVM performance analysis. I can take ownership of an existing codebase, investigate difficult issues, and deliver maintainable, production-ready features. Selected experience: * Architected the backend and MySQL database for a Costa Rican electronic invoicing platform built with Java 21 and Spring Boot * Implemented government invoice submission, subscription management, payment integrations, reporting, and complex business workflows * Led and coordinated a development team of up to 10 people * Automated commercial JDK building and JCK testing, reducing the release process to several hours * Developed secure APIs and third-party integrations for open banking and investment systems * Diagnosed JVM memory, garbage collection, threading, and performance problems * Maintained existing Java applications and resolved production issues for long-term Upwork clients How I can help: * Java and Spring Boot backend development * REST API design and third-party API integrations * Spring Security, JWT, OAuth, and role-based access control * Microservices and asynchronous processing * MySQL, PostgreSQL, OracleDB, Hibernate/JPA, and Flyway * Unit and integration testing with JUnit and Mockito * Debugging, refactoring, performance analysis, and production support * Docker, Git, Maven, Gradle, and CI/CD workflows I focus on clear communication, practical architecture, maintainable code, and dependable delivery. If you need a Java engineer who can understand both the technical implementation and the underlying business requirements, send me a message with your project details.

Getting things done start to finish, high complexity projects, diverse technologies, performance, reliability and quality. I have a track record of solving difficult problems and delivering complex cross functional software projects, deploying engineering solutions that benefit the entire organization, and defining key technical standards. I build, coach and support stellar teams while being hands-on and fully engaged in technical intricacies. Core specializations: - Complex distributed systems - design, architecture, quality control, maintenance strategies - Identity management, account security, financial compliance, KYC, data privacy - Large systems modernization and refactoring - Operations reliability, high availability/high performance services - Defining organizational standards, mentoring, tech hiring strategies Platforms and environments: - backend and full stack web development - high availability services and applications - cross platform mobile development Technology background: - software development: Java, Scala, Clojure, ClojureScript, Python, JavaScript, Dart, TypeScript, PHP - deployment and maintenance: Linux, FreeBSD, AWS, GCP, Grafana, Prometheus - databases: PostgreSQL, MySQL, Oracle, MongoDB, DynamoDB and others - mobile development: React Native, Flutter, native iOS apps