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Payment Gateway Integration Engineers online
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10,0
10,0
97%

Indore, India
$20 USD pro Stunde
Hello, everyone! Worked on 3000+ projects and earned more then 5M+ dollars. Give a chance, Rest Assured definitely you will get quality work on time and within your budget with FREE MAINTENANCE. We are a group of committed professionals with a combined experience of 20 years in creating iOS/Android Mobile Applications. We have a talented pool of technical professionals with experience in the latest technology solutions for global business purchasers. We have designed & developed 1000+ projects, including Mobile Applications, Websites and Software Development; all with exceptional results. Technical Skills: * Mobile Development (Android, iOS, React Native, Flutter, Hybrid) * React JS, Node JS, Next JS, Socket.io,PHP (Core PHP, Cake PHP, Codeigniter, laravel, MVC) * eCommerce (Opencart, Shopify, Magento, Wordpress, Woocommerce) * Designing (Website, Graphic, Logo Design, Mobile UX/UI Design) * Social Networking Integration - Facebook, Linkedin, Twitter, Instagram, Youtube We are privileged to serve the best brands in India and even international markets. We'd be glad to assist you for any help you may need! Many thanks for visiting our profile! "Work to Fuel Your Dreams"

8,3
8,3
97%

Gujrat, Pakistan
$30 USD pro Stunde
Hello and welcome to my profile! * 7 years of Experience * Always on the top of the latest technologies * Good communicational and planning skills Skills set: * PHP * Laravel * Codeigniter * Symphony * WordPress * Android * IOS * Ionic * ReactJS * VueJS * AngularJS * Python * Management Systems * HTML/CSS

9,5
9,5
99%

Kolkata, India
$20 USD pro Stunde
Fourtunedesign is a web & graphic design company. Top Rated by Preferred Freelancer Team.We are specialized in various platforms and working on different fields such as: - Logo Design - UI/UX Design - FIGMA - Website Design & Development - Print Media. - Branding - Illustration - Icon Design - Poster Design - Digital Painting - Banner Design - Leaflets - Letterheads - Flyer Design - Business Cards - Brochure Design - T-shirt Design Our specialization is customized logo and web designing so we provide 100% original work.. I can deliver quality notes to tight deadlines.We believe in 100% customer satisfactory work, so our designing packages have flexible pricing and unlimited revision until your satisfaction.

10,0
10,0
97%

Surat, India
$15 USD pro Stunde
⭐ Top 1% on Freelancer.com | Narola Infotech - Digitalising Businesses Since 2005 ✎ About Us We are Narola Infotech, a globally recognized IT solutions company with 20+ years of experience delivering high-performance web, mobile, and enterprise software solutions to 1500+ happy clients across 50+ countries. Trusted by Fortune companies like CGI, L&T, Infosys, Biocon, and TVSNext. We don't just build software, we build lasting partnerships. Our approach is simple: understand your vision, deliver beyond expectations, and stay with you every step of the way. ✎ Why Choose Us? ➬ 20+ Years of Industry Experience ➬ 350+ Talented IT Professionals ➬ 3000+ Successfully Delivered Projects ➬ 95% Client Retention Ratio ➬ 4.9 ⭐ Clutch Rating ➬ 100% Project Success Ratio ➬ Clutch Top 1000 Companies Global 2022 ➬ Best Outsourcing Company - SGCCI ✎ Our Services ➬ Custom Web & Mobile App Development ➬ Custom Enterprise Software Development ➬ AI/ML & Data Analytics Solutions ➬ QA & Software Testing (Automation, Security, Performance) ➬ DevOps, Cloud Migration & Managed Services ➬ Salesforce Consulting, Implementation & Support ➬ Staff Augmentation - Dedicated Teams or Individual Developers ➬ Support & Maintenance ✎ Tech Stack ➬ Frontend: ReactJS, AngularJS, VueJS, NextJS, NuxtJS ➬ Backend: Node.js, Java, PHP, Laravel, .NET, Python, Django, WordPress ➬ Mobile: Flutter, React Native, iOS (Swift), Android (Java/Kotlin) ➬ Cloud & DevOps: AWS, Azure, Docker, Kubernetes, Jenkins, CI/CD, Terraform ➬ Database: MySQL, MongoDB, PostgreSQL, Firebase, MS-SQL ➬ Other: Salesforce, MS Dynamics 365, Power Platform, Big Data, AI/ML, Automation ✎ Industries We Serve ● Fintech ● Healthcare ● Retail & Ecommerce ● Education ● Real Estate ● Media & Entertainment ●Transport & Logistics ✎ Our Strengths ➬ Agile Development Methodology ➬ Daily & Weekly Progress Reports ➬ Clear Communication & Collaboration ➬ 100% Plagiarism-Free & Secure Delivery ➬ Guaranteed Data Privacy & NDA Protection ➬ Flexible Engagement Models: ● Fixed Cost ● Time & Material (Hourly) ● Dedicated Team ● Hybrid Model (Fixed + Hourly) ✎ Our Promise "You will get the value of every penny you spend. We are committed to driving your business forward with reliable, quality solutions powered by technology and innovation." - Ashish Narola, CEO

9,4
9,4
98%

Karachi, Pakistan
$20 USD pro Stunde
At Digital Arcanum, we don’t just deliver services — we build complete digital growth systems. With over a decade of experience, we’ve worked with global brands and multi-million to multi-billion dollar companies, helping them scale through strategy, technology, and performance marketing. Every project is personal. We go beyond templates and generic execution to create high-performance digital ecosystems that drive traffic, engagement, and conversions. Strategy First — The Real Game Changer We don’t believe in random posting or design. Every action is backed by data, intent, and business goals. From first impression to final conversion, everything is connected. If your brand is posting but not growing or your website isn’t converting — you don’t need more content, you need the right system. 👉👉Social Media & Performance Marketing We are social media growth specialists, not just managers. We build and scale brands across: Instagram, Facebook, TikTok, and YouTube Our services include: Social media strategy & content systems High-quality design (Adobe Photoshop & Illustrator) Reels & video editing (Adobe Premiere) AI-powered content (ChatGPT, Claude) Copywriting & engagement optimization Meta Ads & Google Ads (conversion-focused) Retargeting & scaling strategies Goal: Turn attention into revenue 👉👉Website Development & Automation We build fast, scalable, SEO-optimized platforms: 👉WordPress, Shopify, Webflow, Wix, Squarespace 👉GoHighLevel (GHL) funnels, landing pages, CRM 👉Full-stack solutions & API integrations 👉Automation using n8n & CRM workflows 👉SEO & Branding We drive long-term growth through: Keyword research & technical SEO Content strategy & optimization eCommerce SEO We also create premium brand identities: 👉Logo design & corporate identity 👉Marketing collaterals, packaging, pitch decks 👉UI/UX for websites & mobile apps Why Digital Arcanum 👉1000+ successful projects 👉Experience with global brands 👉Strategy-first approach 👉Strong focus on ROI 👉Built-in quality checks 👉24/7 operations Final Thought Most agencies deliver services. We build systems that scale businesses. Digital Arcanum — Where Strategy Meets Growth

10,0
10,0
99%

Surat, India
$21 USD pro Stunde
Smartinfosys is a leading website development, corporate branding and SEO company that has been on the scene since 2001. Starting with a small set-up, we have gradually consolidated our resources and today have 150+ full-time team members working for you in Five Development Centers in India. We fit in with your aspirations and works with the sole objective of empowering you and your business by providing state-of-the-art website design & development services, android & iOS apps design & development, corporate branding services, graphic design, and SEO services. Our services are: Website Design & Development Android & iPhone Apps Custom PHP Application Development Regular Website Maintenance Ecommerce Website Development CMS Website Development WordPress Websites API Integration, LLM API,REST API PHP Open Scripts Customization SEO,Node.js Audit AWS Corporate Branding / Graphic Design / Print Design Logo/ Van-Truck Wrap design / Tradeshow displays/ Flyers/Brochures/Book Covers/ PPT Presentation Social Media Marketing / Digital Marketing Blog ,Article writing We have featured in international publications such as Techgoss, 1mby1m and The Economic Times for our contribution to the web industry.

9,1
9,1
99%

Antalya, Turkey
$45 USD pro Stunde
I've been on internet since 1996. I always tried to do something with programming. Started with mirc scripting, then created my own websites (I had 1500+ websites when it was 2005) and earned a lot of money with domain parking and google adsense. Since I was not so good with programming, I was asking help from other people. But as you probably guess, I had many many problems with programmers. Then, I decided to improve my programming skills. Finally, I realized that coding is the coolest thing in the world. I feel better when I help other people over the world. This is how I became freelancer programmer :) I love coding and ready to help you. - Web Scraping / Crawling - Data extraction - Data conversion - API Integration - Wordpress plugin

9,4
9,4
98%

JAIPUR, India
$12 USD pro Stunde
⭐ 4.9 Rating | 🏆 1,700+ Projects Completed | 👥 1,000+ Happy Clients | 🔄 80%+ Client Retention Rate | 👍 258 Recommendations Hi, I'm Shobha, a Digital Marketing Specialist with 15+ years of experience helping businesses increase visibility, generate qualified leads, and achieve sustainable online growth. Leading a team of 25+ SEO experts, developers, designers, and marketers, we provide complete digital solutions, including SEO, AEO (Answer Engine Optimization), GEO (Generative Engine Optimization), Google Ads (PPC), Social Media Optimization (SMO), Social Media Marketing (SMM), Website Design, Website Development, Mobile App Development, E-commerce Solutions, and Custom Website Development. Our expertise helps businesses rank higher on Google Search, gain visibility on AI-powered platforms such as ChatGPT, Gemini, and Perplexity, generate high-quality leads through paid advertising, and build high-performing websites that convert visitors into customers. 💼 Our Expertise ✅ Search Engine Optimization (SEO) ✅ Answer Engine Optimization (AEO) ✅ Generative Engine Optimization (GEO) ✅ Google Ads & PPC Campaign Management ✅ Social Media Optimization (SMO) ✅ Social Media Marketing (SMM) ✅ Website Design & UI/UX Development ✅ WordPress Development ✅ Next.js & React Development ✅ PHP, Laravel & Custom Web Applications ✅ Shopify & E-commerce Development ✅ Mobile App Development (Android & iOS) ✅ Hosting, Maintenance & Technical Support 🎯 Our Approach Analyze → Strategize → Execute → Optimize → Scale We begin by understanding your business, competitors, target audience, and growth objectives. Based on detailed research and data analysis, we create customized strategies that combine SEO, AEO, GEO, PPC, Social Media Marketing, Website Design, and Development to maximize visibility, generate qualified leads, improve conversions, and increase ROI. ✔ Research-Driven Strategy ✔ Data-Based Decision Making ✔ Transparent Communication & Reporting ✔ Focus on Leads, Sales & ROI ✔ Continuous Optimization & Performance Tracking ✔ Long-Term Growth & Brand Authority Your One-Stop Solution for SEO, AEO, GEO, PPC, SMO, SMM, Website Design, Development, and Digital Growth. 👉 Let’s connect and take your business to the next level of online success.

10,0
10,0
98%

Puttalam, Sri Lanka
$20 USD pro Stunde
If you are seeking a strategic technology partner who delivers modern, scalable, and intelligent digital solutions, you are in the right place. We are a forward-thinking team specializing in Software Engineering, Web & Mobile Development, AI Solutions, and Intelligent Automation. Our approach is focused on building future-ready systems that combine clean architecture, performance, and business impact. Our technical expertise spans PHP, Node.js, Angular, Flutter, React, React Native, C#, VB.NET, and leading platforms such as WordPress, WooCommerce, Magento, and PrestaShop, supported by enterprise-grade databases including MySQL, PostgreSQL, Oracle, and SQL Server. Beyond development, we help businesses scale through AI-driven innovation and automation, including: - AI chatbots, voice agents, and virtual assistants - Workflow and process automation using Make (Integromat), n8n, and custom solutions - AI-powered data processing, content generation, and decision support - CRM, marketing, and operations automation to reduce costs and increase efficiency We have strong expertise in API-based integrations and ecosystem automation, connecting platforms such as Amazon, eBay, Shopify, Walmart, Lazada, Wish, and logistics providers including USPS, UPS, FedEx, and DHL, enabling seamless commerce and fulfillment workflows. Our focus is not just on delivery, but on measurable outcomes, speed, reliability, scalability, and long-term value. We thrive on complex challenges and continuously adopt the latest AI and automation trends to keep our clients ahead of the curve. Review our portfolio below and let our work demonstrate the standard we uphold. We are committed to delivering solutions that are intelligent, efficient, and built for growth.
A Payment Gateway Integration Engineer is a developer who connects websites, mobile apps, and software platforms to payment processors so businesses can securely accept credit cards, digital wallets, and alternative payment methods. This specialist handles the technical work of integrating APIs from providers such as Stripe, PayPal, Braintree, Adyen, and Authorize.Net, ensuring transactions flow reliably between the customer, the merchant, and the acquiring bank.
Hiring a skilled payment integration engineer is critical because checkout is where revenue is won or lost. A poorly integrated gateway leaks sales through declined cards, failed redirects, and abandoned carts, while a clean integration protects conversion rates, supports global currencies, and keeps sensitive cardholder data outside the merchant's environment. For any business processing online payments, this hire directly affects cash flow, fraud exposure, and regulatory standing.
These engineers build and maintain the full payment stack on the merchant side. The work spans server-side API integration, client-side checkout components, webhook handling, and reconciliation logic. Typical deliverables include:
Payment integration sits at the intersection of backend engineering, security, and platform-specific SDKs. Strong candidates are fluent in REST APIs, webhooks, and asynchronous event handling, and they typically work across several of the following:
Payment gateway integration work is in demand across nearly every sector that collects money online. Common engagements include e-commerce stores adding new payment methods, SaaS companies launching subscription billing, marketplaces building split payments and payouts, mobile apps adding in-app purchases through Stripe Connect or PayPal Payouts, fintech startups embedding card acquiring into their products, donation platforms, education and online course platforms, on-demand services, ticketing systems, and healthcare or telemedicine providers needing HIPAA-aware payment flows. Marketplaces in particular require careful work around KYC, escrow, and disbursement that goes beyond a basic checkout integration.
Because payment code touches money and regulated data, hiring standards should be higher than for general web work. Look for engineers who have shipped live integrations, can speak fluently about edge cases, and treat security as a first-class concern.
Useful interview questions a client can ask directly:
Freelancer.com gives you access to a global pool of payment specialists who have worked across nearly every major gateway, region-specific processor, and e-commerce platform. Whether you need a one-off Stripe integration, a Shopify checkout customization, a multi-gateway routing layer, or ongoing maintenance of subscription billing, you can post a project on Freelancer.com and receive competitive bids from engineers who match your stack and budget. Clients set their own budgets, review verified portfolios, and use Milestone Payments to release funds only when work is verified. The scale of freelancers on Freelancer.com means you can find specialists with deep experience in niche gateways like Razorpay, PayU, Paystack, Flutterwave, or Mercado Pago alongside mainstream providers, making it a practical place to hire on Freelancer.com regardless of which market you serve.
Ready to accept payments cleanly and securely?
Hiring for payment work is different from hiring a generalist developer because the brief needs to be specific about gateways, payment methods, and compliance expectations. The clearer you are about your stack, target markets, and transaction model, the better the proposals you will receive. The process on Freelancer.com follows three straightforward steps.
The project brief is the single biggest determinant of bid quality. For payment integration work, vague briefs attract generic bids, while specific briefs attract engineers who have already shipped exactly what you need. Head to the
Bids are short proposals, not just price quotes. A strong proposal for payment work shows the engineer has read the brief, understands the gateway, and has thought through edge cases like webhook retries, refunds, and authentication. Read each proposal carefully and shortlist candidates whose technical approach matches your requirements.
The final decision combines proposal quality with profile evidence. Payment work rewards consistency, so weigh the depth of a freelancer's track record rather than a single impressive example. Look closely at how previous clients describe communication, reliability, and post-launch support.
A standard single-gateway integration on an existing application typically takes one to three weeks, depending on whether you need subscriptions, webhooks, and refund tooling. More complex work, such as marketplace split payments, multi-currency support with smart routing, or full PCI-compliant custom checkouts, can run longer. The brief, sandbox access, and clarity of your business logic are usually the biggest factors in timeline.
Yes. Many merchants hire a freelancer specifically to ship an initial integration, fix a broken webhook flow, add a new payment method, or migrate from one gateway to another. You can also retain the same engineer on an ongoing basis for maintenance, gateway updates, and fraud tuning once the initial work is live.
A general backend developer can write APIs, but a payment integration specialist understands the specific risks and patterns of money movement: idempotency, webhook reliability, PCI scope, 3DS2, chargebacks, and reconciliation. That domain knowledge prevents costly mistakes like duplicate charges, lost transactions, or accidental storage of raw card data.
If your integration uses hosted fields, iframes, or redirects so card data never touches your servers, you generally qualify for the simplest PCI self-assessment (SAQ-A). A good integration engineer will architect the checkout specifically to keep you in that reduced scope, but compliance ultimately remains the merchant's responsibility.
Yes. Engineers regularly build abstraction layers that route transactions to different processors based on currency, region, card type, or cost. This is common for international merchants who want a primary global gateway alongside local processors for better acceptance rates.

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