I build cloud-native products that ship fast, scale cleanly, and stay reliable.
I’m Harry Revisios, a Full-Stack Engineer with 7+ years of experience building high-traffic web and mobile products in product-led environments. I specialize in TypeScript, React/Next.js, and AWS serverless architectures, with strong experience in Stripe payments, subscriptions, and event-driven systems.
Core focus
AWS Lambda · DynamoDB · AppSync
Event-driven EventBridge · SQS
Payments Stripe · Subscriptions
Frontend React · Next.js
Mobile React Native (iOS)
Based in
Core Expertise.
Cloud-native & event-driven
AWS serverless architecture
Lambda, API Gateway, AppSync, DynamoDB, EventBridge, SQS, S3 with a focus on reliability and cost efficiency.
Event-driven systems
Asynchronous workflows, idempotent handlers, retries, and observability for real-world production behavior.
Infrastructure as code
AWS CDK for repeatable environments, safe deployments, and maintainable stacks.
Product Engineering
Payments & Subscriptions
Stripe Checkout + Payment Intents, subscription lifecycles, webhooks, and consistent customer state.
TypeScript-first frontend
React, Next.js, modern state/data patterns, component systems, and performance-focused UI delivery.
Performance & monitoring
Pragmatic instrumentation, failure-mode thinking, and optimization where it matters (latency, throughput, UX).
My Experience.
01/2026 –
Pasteque Electronics & Computer Systems · Larissa, GR (On-Site)
ERP Consultant | Software Development & Integrations
Develop custom JavaScript applications and business logic within Pylon ERP. Build warehouse management (WMS) applications for inventory tracking and warehouse operations. Develop SQL Server queries and custom reports covering inventory, stock movements, and supplier data. Integrate external applications with Pylon ERP through its Connectivity API.
03/2024 – 01/2026
Cloud Touchless Massage · NY, USA (Remote)
Full-Stack Engineer
Built a centralized AWS serverless stack handling high-traffic, customer-facing workloads with 99.9% uptime. Developed a React Native iOS app deployed across 15 iPads enabling real-time massage chair control, reducing staff workload by 80%. Created a Next.js web app with Stripe billing, processing hundreds of payments daily. Implemented 60-second heartbeat checks and reliability patterns, cutting downtime by 90%.
09/2020 – 02/2024
Authoritive Inc. · New York, USA (Remote)
Full-Stack Engineer
Led frontend development for a microlearning SaaS used by 30+ authors to convert content into interactive programs. Built key features like a drag-and-drop editor and checkout builder, reducing publishing time by 70%. Contributed to serverless backend services with 99.9% uptime powering thousands of daily deliveries. Implemented multi-channel delivery (SMS, WhatsApp, MS Teams) reaching 3,000+ active users.
10/2015 – 09/2020
Freelance · Larissa, Greece
Web Developer
Built and launched 10+ mobile-first websites for local businesses. Applied SEO best practices, boosting traffic by 30% in three months. Optimized performance, cutting load times by 40% and improving UX.
Certifications.
May 2026
Microsoft
Microsoft Certified: Azure Fundamentals
Selected Work.
Two flagship systems that best represent how I think about product engineering, architecture, and production reliability. If you want more, link out from these case studies instead of listing many smaller projects.
Cloud Touchless Massage
AWS Serverless
Real-time control
Stripe Billing
React Native
• Centralized serverless platform supporting high-traffic customer sessions with 99.9% uptime.
• React Native iOS app across 15 iPads enabling real-time chair control, reducing staff workload by 80%.
• Stripe integration for memberships + day passes, processing hundreds of payments daily.
• Heartbeat monitoring and resilience patterns reducing downtime by 90%.
Authoritive Self-Service Platform
Microlearning SaaS
React/Next.js
AWS Serverless
GraphQL
• Frontend lead for a microlearning SaaS used by 30+ authors.
• Built drag-and-drop editor and checkout builder, reducing publishing time by 70%.
• Serverless backend (Lambda, DynamoDB, AppSync, S3) with 99.9% uptime powering thousands of daily deliveries.
• Multi-channel delivery reaching 3,000+ active users (SMS, WhatsApp, MS Teams).
Maintained repos.
Small utilities and libraries I use in real projects. These are actively maintained and kept intentionally focused.
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Reach out.
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What I'm looking for
Product teams that value strong engineering fundamentals: type safety, clean architecture, observability, and disciplined delivery.
Education
BSc (Hons) Computer Science · Mediterranean College (In progress)
Languages: Greek (Native), English (Fluent C2)