Hire the Best Payment Processing Specialists
in Ukraine

More than 3,000 reviews on G2
Rating is 4.5 out of 5.
4.5/5
of Upwork by G2 peer reviewers
Anton P.

Myrhorod, Ukraine

$35/hr
5.0
1 jobs

"Cut our monthly AWS costs by 61%, from $2,280 down to $817, with zero disruption to production workloads.", โ€” CTO, Fintech Startup ๐Ÿ† AWS DevOps Engineer, Senior DevOps, AWS Architect, Cloud Engineer with 6+ years in AWS, Azure, Kubernetes and cloud infrastructure enhancement โœ… ABOUT ME As an Certificate AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer, I bring 6+ years of hands-on experience across AWS, azure and kubernetes environments, moving fluidly between aws devops and azure devops work depending on what the client's stack demands. 39% lower AWS spend, from $2,000 to $800/month, delivered while working as an AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer for a Fintech SaaS client, where aws devops and devops practices ran side by side across a hybrid AWS and azure stack, backed by tight security & compliance controls and FinOps discipline from day one. 99.9% uptime and 60% faster releases came from building CI/CD and ci/cd pipelines with github actions, plus ci/cd azure workflows, in my role as an AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer for teams standardizing on Azure DevOps. 25+ kubernetes clusters managed with Docker and docker devops workflows cutting deployment time by 45%, work I take on as an AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer across both aws and azure devops environments. 12+ production environments hardened for security & compliance, with IAM policies and FinOps cost controls reducing audit findings by 30% on every AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer engagement I run. 18,000+ daily requests routed through ECS/Fargate, with Terraform/CDK and other IaC tools cutting environment provisioning from days to minutes, a core part of how I work as an AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer. 6+ mlops pipelines deployed alongside data engineer teams and a senior full stack developer, cutting model deployment time by 40% using python automation as an AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer. โœ… WHERE I DELIVER On AWS - 20+ cloud infrastructure builds spanning ECS/Fargate, kubernetes and multi-region AWS deployments for SaaS and Fintech platforms, all run with aws devops rigor as an AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer. On Azure - 15+ azure devops pipelines, ci/cd azure workflows and azure cloud engineer projects cutting release cycles by 35%, with github actions and CI/CD tying it all together in my work as an AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer. Across security & compliance - 25+ IAM design and framework projects for regulated industries, backed by devops best practices across aws and DevOps tooling as an AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer. Across Docker and kubernetes - container orchestration and ci/cd pipelines lifting deployment frequency by 3x, whether the client calls it devops, aws devops or azure devops. With python - 12+ automation scripts and mlops integrations, 28% lower operational overhead, often working alongside a full stack developer or senior full stack developer on shared codebases. On infrastructure due diligence - project manager coordination on erpnext frappe deployments before funding rounds as an acquisition manager, where devops and aws hygiene matter as much as the numbers. โœ… INDUSTRY IMPACT Fintech, Payments - 39% AWS cost reduction ($2,000 to $800/month), 99.9% uptime and AWS End User Messaging integration cutting notification latency by 50%, delivered as an AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer running aws devops and devops practices daily. SaaS, B2B Platforms - multi-region AWS deployments and IaC tools like Terraform/CDK reducing infrastructure drift incidents by 60%, with aws and azure devops kept in sync throughout. AI, MLOps - 6+ mlops pipelines processing 10,000+ daily inference requests with automated CI/CD and ci/cd pipelines, working alongside a data engineer with python scripting the glue between them. Enterprise Cloud Migration - github actions-driven ci/cd azure pipelines migrating legacy workloads with zero downtime, devops throughout, as an AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer. Startups and Scaleups - cloud infrastructure enhancement and erpnext frappe deployments cleaned up before funding rounds as an acquisition manager and project manager, aws and devops working hand in hand. โœ… HOW I BUILD On AWS: aws, aws devops, ECS/Fargate, kubernetes, Docker, docker devops, Terraform/CDK, IAM, FinOps, the core stack behind every AWS DevOps Engineer, Senior DevOps, AWS Architect and Cloud Engineer engagement. On Azure: azure, azure devops, ci/cd azure, github actions, cloud infrastructure enhancement, devops throughout.

  • Kubernetes
  • Terraform
  • Docker
  • DevOps
  • Amazon Web Services
  • CI/CD
  • Jenkins
  • Linux
  • Python
  • Ansible
  • Git
  • Google Cloud Platform
  • Cloud Architecture
  • AWS CloudFormation
  • Amazon EC2
  • Cloud Computing
  • Amazon ECS
  • Microsoft Azure
  • AWS Lambda
  • Deployment Automation
Anatolii N.

Kyiv, Ukraine

$35/hr
4.9
30 jobs

Payment bugs and failed webhooks cost you real revenue. I build and fix payment flows that reconcile to the cent: Stripe integrations, subscriptions and billing, invoicing, card processing, bank APIs. 10+ years of backend engineering (Node.js, TypeScript, PostgreSQL), currently a team lead at a fintech company processing millions of transactions. $100K+ earned on Upwork, 100% Job Success, including two 6-year contracts with the same clients Senior full-stack engineer with $100K+ earned on Upwork, 4,300+ hours, and a 100% Job Success Score. I ship and stabilize production web systemsโ€”from urgent Vue/Nuxt/React frontend work to Node.js APIs, PostgreSQL, payment flows, and AI integrations. Iโ€™m a strong fit when you need: โ€ข a production bug fixed without destabilizing an existing codebase โ€ข a responsive landing page or frontend implemented from Figma โ€ข a Node.js/TypeScript API or third-party integration โ€ข payment, transaction, invoicing, or fintech business logic โ€ข an n8n or OpenAI/Claude workflow engineered with retries, validation, and safe failure handling My Upwork history includes long-running full-stack products, complex frontend animation, and quick delivery on focused frontend tasks. Clients have specifically highlighted speed, reliability, and the ability to get difficult UI work right the first time. Core stack: Node.js, TypeScript, JavaScript, PostgreSQL, Vue.js, Nuxt, React, NestJS, REST APIs, Docker, payment integrations, n8n, and OpenAI/Claude APIs. Send me the current codebase, design, or production issue, and Iโ€™ll give you a direct assessment of the solution, risks, and realistic delivery time.

  • Payment Processing
  • Node.js
  • Stripe
  • Payment Gateway Integration
  • FinTech
  • PostgreSQL
  • TypeScript
  • JavaScript
  • Software Architecture
  • Database Design
  • REST API
  • API Integration
  • Vue.js
  • NestJS
  • AI Agent Development
  • n8n
  • OpenAI API
  • React
  • Nuxt.js
  • Front-End Development
Oleksii Z.

Irpin', Ukraine

$30/hr
5.0
3 jobs

I am a senior EMV L3 certification and payment integration consultant with 10+ years of hands-on experience in POS, SoftPOS and ATM solutions. I have delivered 50+ successful Visa, Mastercard MTIP, JCB, Amex and UnionPay certifications for POS/ATM vendors, acquiring banks and processors across Europe, the Middle East and Asia. My core expertise includes: โ€ข EMV Level 3 certification (Retail & Cash) โ€ข POS, SoftPOS (CPoC / MPoC) and ATM integrations โ€ข ISO8583 transaction flows and payment debugging โ€ข Processor-side integrations (Tieto, CompassPlus, Way4, SmartVista, UPC, MADA and D8-based processors) โ€ข UL / FIME certification labs and scheme simulators I regularly work with product and engineering teams at the stages where certification, scheme compliance or complex payment issues need to be resolved efficiently. Available for contract, consulting or full-time engagements. Remote.

  • Payment Processing
  • Business Analysis
  • Transaction Processing
  • FinTech Consulting
  • POS Terminal Development
  • Software QA
  • POS Terminal
  • Point of Sale & Payment Systems
  • Android App
  • Mobile App Testing
  • Payment Functionality
  • Payment Gateway
  • Manual Testing
  • Android
  • Android SDK
Yaroslav S.

Kremenchuk, Ukraine

$30/hr
5.0
3 jobs

๐Ÿ˜Ž Experienced in building full stack websites for small and medium-sized businesses, I can bring your idea into a fully functional full stack project. Whether youโ€™re trying to sell your products, offer your services, or create a new online store, I can help as a full stack developer. ๐ŸŽฒ Creator of t.me/dndArenaCommunity ๐Ÿ’ป Tech skills โœ”Node JS | TS: โ— NestJS โ— AdonisJS โ— ExpressJS โ— RestAPI / GraphQL โ— Sequelize, TypeORM, Mongoose โ— Web3.js / Ether.js / Viem โ— npm / yarn / npx โœ”PHP โ— Laravel | Eliquent โ— Symfony | Doctrine โ— Lumen โ— CodeIgniter โœ”EcmaScript | TS โ— Vue 2/3, Vuex | Pinia, Vuetify | Vueuse โ— React, Redux | Thunk/Saga โ— Angular | RxJS โœ”Styles โ— CSS / SCSS / SASS โ— TailwindCSS โœ”Databases โ— MySQL | MariaDB โ— PostgreSQL โ— MS SQL Server โ— MongoDB โ— SQLite โ— ClickHouse Don't hesitate to contact me. Share your ideas and let's work together to expand your business globally using my full stack expertise.

  • Node.js
  • Amazon Web Services
  • Vue.js
  • React
  • Angular
  • NestJS
  • DevOps
  • Web Development
  • Full-Stack Development
  • Microservice
  • GraphQL
  • Web3
  • Ethers.js
  • DeFi
  • CI/CD
Vladyslav S.

Kyiv, Ukraine

$35/hr
5.0
101 jobs

The pitch decks I design have helped SaaS & Tech startups raise over $40 million โ€” from pre-seed to Series B. My clients include Westmount Wealth, CPI Capital, Citi and Neura Energy, operating across SaaS, Fintech, and high-stakes B2B environments. If you need an investor pitch deck, a B2B sales presentation, or a scalable template design system built to a standard that serious clients and investors trust โ€” this is what I do. ๐Ÿ’ก WHAT MAKES MY PROCESS DIFFERENT I am a Figma-first presentation designer. Every deck is architected in Figma for pixel-level precision before a single slide is built in PowerPoint or Google Slides. Here is the critical advantage: most designers who work in Figma deliver beautiful decks that are locked as flat, uneditable images in the final PowerPoint file. Every file I deliver is 100% natively editable โ€” live text, adjustable colors, fully functional shapes โ€” so your team can open it and work with it immediately. Figma-level aesthetics. PowerPoint-level editability. No compromises. ๐Ÿ“‹ MY STEP-BY-STEP WORKFLOW 1. Brief & Discovery โ€” we align on your goals, audience, narrative, and key outcomes 2. Reference Gathering โ€” I collect visual references to define the aesthetic direction 3. Demo Slides โ€” I design 2 to 3 sample slides for your approval before touching the full deck 4. Full Deck Design โ€” once the direction is locked, I build the complete presentation in Figma, then convert to your chosen format 5. Revisions โ€” structured feedback rounds until every slide is right 6. Final Delivery โ€” 100% natively editable PowerPoint/Google Slides/Canva/Keynote file, ready to present ๐Ÿ’ผ CORE SERVICES โ€ข Investor Pitch Decks โ€” from Seed to Series A, built to hold the room with VCs and institutional investors โ€ข Master Slide Template Systems โ€” scalable, fully branded PowerPoint or Google Slides systems your entire team can use consistently โ€ข B2B Sales & Corporate Decks โ€” high-converting presentations for enterprise sales cycles, internal reviews, and stakeholder communications โ€ข Deck Refresh & Visual Elevation โ€” taking an existing pitch deck and polishing it to a premium standard without a full rebuild โ€ข One-Pagers & Sales Collateral โ€” high-end marketing materials that serve as a perfect entry point for your brand โ€ข Data Visualization & Infographics โ€” transforming complex data and financial models into clear, compelling slide visuals ๐Ÿข INDUSTRIES SaaS, Fintech, Healthcare, Real Estate, Consulting, and E-commerce. If your audience makes high-stakes decisions, I know how to design for that room. If you have a pitch deck, sales presentation, or template design project coming up, send me a brief overview of what you need. I start every project with a conversation โ€” because the best work comes from a clear brief, not a rushed proposal.

  • Presentation Design
  • Pitch Deck
  • Microsoft PowerPoint
  • Business Presentation
  • Google Slides
  • Figma
  • PowerPoint Presentation
  • Startup Pitchbook
  • Sales Presentation
  • Fundraising Presentation
  • Financial Presentation
  • Data Visualization
  • Infographic
  • Visual Presentation Design
  • Storytelling
  • Marketing Presentation
  • Canva
  • Keynote
  • Presentation Slide
  • Graphic Design
Anhelina L.

Kozova, Ukraine

$17/hr
5.0
1 jobs

โœ… READY TO START ASAP ๐Ÿ† QA AUTOMATION ENGINEER | 3+ years| PLAYWRIGHT SPECIALIST | DRIVING PRODUCT QUALITY WITH AI TESTING Hi, Iโ€™m Lina, a Senior QA Automation Engineer with deep expertise in Playwright. I team up with fast-scaling tech companies across the US and Europe to replace sluggish manual QA processes with highly efficient, automated pipelines. My focus is on removing release bottlenecks so your team can ship faster, scale securely, and deploy to production with zero risk. โœ”๏ธ QA Automation Engineering: Re-architecting legacy test suites into lightning-fast, highly resilient CI/CD pipelines leveraging scalable Playwright frameworks and uncompromising quality gates. โœ”๏ธ AI-Powered QA Strategies: Integrating AI-driven testing agents within robust Playwright environments to optimize coverage and secure complex, non-linear workflows where standard automation falls short. โœ”๏ธ Quality-Driven Mindset: Enforcing a zero-noise testing standard. I wipe out flaky tests using Playwright, guaranteeing absolute build reliability for developers and sustaining elite product quality. As a dedicated QA specialist, my focus is on engineering modern testing ecosystems with Playwright that seamlessly bridge the gap between agile development and flawless end-user experiences. Leveraging my background in test automation, I architect robust, production-ready Playwright frameworks from the ground up. I started my path in tech with a deep interest in software quality. Early in my career, I worked as a manual tester, which taught me the tester's mindset - the ability to find edge cases and understand user pain points. This foundation makes me a better Playwright specialist today: I don't just automate scripts; I automate the most impactful scenarios for QA testing. Over the last 3 years, I have evolved into a proficient QA Automation Engineer, leading QA testing efforts for complex web and mobile platforms with a focus on stable Playwright pipelines. WHAT I HELP WITH: 1๏ธโƒฃ. Web & Mobile Automation Architecture I build test suites from scratch using Playwright, WebDriverIO and Appium, focusing on Page Object Model (POM) for maintainability. As a QA testing specialist, I specialize in: โ— Building robust suites from scratch with Playwright, WebDriverIO and Appium. โ— Advanced UI automation and QA testing with Playwright (JavaScript/TypeScript). โ— Modern, fast, and reliable QA testing with Cypress and Playwright. โ— Integration with CI/CD tools like Jenkins, GitHub Actions, and GitLab CI. I work as a qa tester ensuring that both web and mobile interfaces function perfectly. 2๏ธโƒฃ. Technical Stack & Market-Leading Tools As a technical automation engineer, I leverage a modern stack for QA testing that clients look for most: โ— Frameworks: Playwright, WebDriverIO, Appium, Mocha, Jasmine. โ— API Testing: Postman, Axios, Playwright API testing for robust backend validation. โ— Infrastructure & DevOps: Docker, Jenkins, Git, BrowserStack, SauceLabs. โ— Mobile Testing: Appium Inspector, Appium Device Farm, Xcode/Android Studio. โ— Scripting: Python automation, JavaScript/TypeScript, and SQL for QA testing database verification. This allows me to support developers with clear, actionable Playwright data and maintain high-speed delivery. 3๏ธโƒฃ. Quality Assurance Software Strategy I design the QA testing software lifecycle: โ— Defining Playwright testing strategies from the ground up for maximum coverage. โ— Identifying which parts of the system require QA testing automation for the best ROI. โ— Test Management: Using Jira, Zephyr, or TestRail to track QA testing progress. โ— Creating professional Playwright reports with Allure for clear visibility of the product state. 4๏ธโƒฃ. Specialized Testing Experience My experience includes QA testing complex systems, including those built on popular CMS platforms. For instance, I have worked as a WordPress developer in the context of QA testing, which helps me understand the internal architecture of such sites. This technical background and Playwright knowledge allow me to identify potential vulnerabilities and architectural flaws much faster than a standard qa tester. 5๏ธโƒฃ. Analytical Testing & Mentoring Even as an automation engineer, I recognize the value of a solid manual QA testing foundation. I often combine my Playwright work with: โ— High-level exploratory QA testing to find "hidden" logic bugs. โ— Mobile app testing across various physical devices and emulators. โ— Mentoring any manual tester on the team to help them transition to Playwright and QA testing. 6๏ธโƒฃ. Performance & Maintenance โ— Playwright suite optimization to reduce execution time. โ— Maintaining and updating existing POM structures to match UI changes. โ— API QA testing to ensure backend stability WHY CLIENTS TRUST ME: โœ”๏ธ 3+ years of focused experience as a QA Automation Engineer in QA testing. โœ”๏ธ Expert in Playwright, WebDriverIO, Appium, Selenium, Cypress, and Postman. โœ”๏ธ Proven track record in building Playwright frameworks

  • Software QA
  • Manual Testing
  • Web Testing
  • Automated Testing
  • Functional Testing
  • API Testing
  • Selenium
  • QA Automation
  • Regression Testing
  • Performance Testing
  • QA Engineering
  • Usability Testing
  • Automation
  • Python
  • JavaScript
  • Software Testing
  • Game Testing
  • Mobile App Testing

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