
Rafayel Jamalyan
Verified Expert in Engineering
Full-stack Developer
Madrid, Spain
Toptal member since August 18, 2022
Rafayel is a seasoned senior full-stack engineer with seven years of industry experience, and he's excited to bring his expertise to the platform. He has a strong background in both mobile and web development. Rafayel is a reliable partner who comprehends the complexities of business and delivers accordingly. Whether a company is evolving its idea into a remarkable product, facing challenges with scaling up, or needing marketing and business automation, he's got its back.
Portfolio
Experience
- JavaScript - 7 years
- React - 7 years
- Web App Development - 6 years
- MySQL - 6 years
- Mobile Development - 5 years
- TypeScript - 5 years
- Artificial Intelligence (AI) - 4 years
- AI Integration - 3 years
Preferred Environment
React Native, TypeScript, Amazon Web Services (AWS), MySQL, React, Node.js, JavaScript, Databases, Claude API
The most amazing...
...software solution I've crafted is a holistic fitness and healthcare app designed to empower individuals to manage every facet of a healthy lifestyle.
Work Experience
Senior Software Engineer
Aderant
- Developed and maintained production features for Aderant’s legal technology platform, supporting law firm workflows across billing, timekeeping, compliance, and practice management.
- Improved back-end and front-end reliability by debugging production issues, reviewing existing code, and delivering clean fixes across complex enterprise-level legal software modules.
- Collaborated with cross-functional engineering teams to support scalable, secure, and maintainable software used by law firms to manage critical business operations.
Head of Software Engineering
Appvertiser AI
- Designed and deployed internal LLM-based agentic workflows, automating campaign analysis across 6+ marketing platforms, which reduced manual labor by 70% and increased decision-making speed by 3x.
- Led engineering vision and execution for AI-first initiatives, delivering infrastructure to support real-time insights from terabyte-scale datasets across multiple APIs.
- Collaborated with C-level leadership to embed autonomous agents into internal ops, increasing team-wide productivity and enabling AI-driven experimentation.
Chief Technical Officer
Fantasy Space
- Oversaw the strategic direction of technology within Fantasy Space, aligning it with overall business goals and objectives.
- Headed the development and implementation of technology initiatives, ensuring they contributed to the company's growth and innovation.
- Collaborated with cross-functional teams to align technology solutions with business processes, fostering efficient operations.
- Defined and enforced technology standards, best practices, and development methodologies to ensure high-quality deliverables.
- Experienced in integrating AI technologies into various applications to enhance functionality and user experience.
- Designed and created the architecture of the eCommerce web application database.
- Evaluated and mitigated technology-related risks, including cybersecurity and compliance issues, to safeguard company assets.
- Tested, optimized, and simplified the queries to the database. Created multiple stored procedures and functions to make the database operations simpler, understandable, and reusable.
- Managed technology budgets, resource allocation, and project timelines, ensuring optimal utilization of resources.
- Provided consultancy services to clients seeking help developing minimum viable products (MVPs) or growing their tech startups.
Senior Mobile/Full-stack Engineer | Team Lead
Leanzer
- Managed and led the medium-sized team to accomplish better teamwork by conducting daily meetings and synchronizing team members' skills.
- Led project planning and execution, including task assignment, progress tracking, and meeting project milestones.
- Designed and created the architecture of a FlutterFlow app for a multiservice.
- Created, documented, and tested a large API with 200+ endpoints via Postman.
- Performed troubleshooting and improved the performance of hard-structured, front-end components.
- Refactored a large codebase, including over 100 UI/logic components on the front end.
- Developed a scalable architecture plan that allowed the application to handle increased user loads by utilizing load balancing, caching mechanisms, and horizontal scaling.
- Designed the database schema, including tables, relationships, and indexes, to optimize data storage, retrieval, and query performance.
- Developed and maintained several FlutterFlow apps with complex integrations and APIs.
- Implemented multi-tenancy application features to support multiple clients or users with a single software instance.
Middle Back-end Engineer
AimTech
- Documented code and technical processes to ensure comprehensive knowledge sharing, fostering smooth project transitions.
- Identified and proposed innovative solutions proactively to address front-end technical challenges, significantly contributing to project success.
- Troubleshot and debugged front-end issues with a keen focus on optimizing user interfaces and enhancing overall user experience.
- Collaborated seamlessly within cross-functional teams, engaging with designers and QA engineers to deliver high-quality, visually appealing front-end software products within project timelines.
- Developed the back end of an app that helps people stop smoking.
- Created an admin dashboard to help the app owner manage all the resources inside the app and see the report via graphs.
- Wrote automated tests via Postman and documented all the request endpoints.
Junior Full-stack Engineer
Natk Systems
- Developed and maintained user-friendly front-end interfaces using HTML, CSS, and JavaScript (without any frameworks) to enhance the overall user experience.
- Built a high-performance front end for payment terminals with Vanilla JavaScript.
- Created a mobile application to accept payments and orders in restaurants.
- Developed and integrated payment protocols for the terminal payment system.
- Created cross-platform mobile applications using Ionic and React Native.
Experience
Leanzer: Fitness Software Solution
https://leanzer.com/As a solo full-stack developer on the Leanzer, my responsibilities included designing and developing the entire application architecture on the front-end and back-end. I was responsible for creating an intuitive and visually appealing user interface for the app, implementing features such as calendar functionality and assignment tracking. Overall, my role encompassed end-to-end development, database management, API integration, testing, and deployment of the Leanzer.
Keak.com: Marketing Automation
https://keak.com/As a front-end developer on the Keak.com project, my responsibilities encompassed the development of the user interface to ensure a seamless and engaging experience for clients involved in A/B testing.
Appvertiser.ai
https://www.appvertiser.ai/As the AI lead engineer, I led the design and development of the platform’s core back-end systems with a strong focus on Go. I architected and built high-performance services in Go to process large volumes of marketing data, power real-time decision engines, and support scalable AI workflows. I designed reliable APIs, optimized concurrency-heavy processes, improved system performance, and ensured stability under growing workloads.
I also developed integrations with third-party advertising, attribution, and analytics platforms, enabling seamless data flow across the ecosystem. In parallel, I worked closely with product and business teams to turn growth goals into technical solutions, prioritize high-impact features, and deliver measurable results. The result was a scalable SaaS platform that reduced manual effort and helped clients make faster, smarter marketing decisions.
Veictor Messenger: Secure B2B Sector Communication App
As a full-stack developer for Veictor Messenger, I was instrumental in developing both the front- and back-end components. I designed and implemented the application architecture, focusing on seamless real-time messaging using Socket.IO. My responsibilities included integrating AI/ML APIs to enhance functionality, implementing robust security features such as time and trusted location checks, and ensuring data integrity through a well-structured MySQL database.
Veictor Exchange: Secure Transactions
As a full-stack developer, I designed and implemented the front- and back-end components of the Veictor Exchange app. My responsibilities included integrating AI/ML APIs for Veictor ID, implementing web scraping for automated contract creation, and developing real-time communication features using Socket.IO. Additionally, I designed and managed the database to ensure scalability and reliability and deployed the application for seamless user access.
Sheet X: Google Apps Scripts Automation, API Integration Project
As the senior developer on this project, I took charge of the entire process, from design to implementation. My primary responsibilities included architecting and developing Google Apps Script solutions to manage complex workflows and API integrations. I meticulously wrote clean, efficient, and well-documented code, ensuring it adhered to best practices and maintained the highest quality standards.
One of the key aspects of this project was integrating various external APIs, particularly RESTful APIs, using Google Apps Script services. This integration enabled smooth data flow and enhanced functionality within Google Workspace applications. Additionally, I conducted thorough testing and debugging to ensure flawless operation, identifying and resolving any issues that arose during the development process.
Health Marketplace Platform
Swipe Threads: Personalized Fashion Experience
Callinger: Second Number App for Wifi Calling
As a full-stack mobile developer, I oversaw the end-to-end development of the Callinger app. I designed the database architecture to ensure efficient data management and scalability and created both the application's front- and back-end components. My work included integrating the Tellnyx API to enable seamless calling and messaging functionalities.
Additionally, I implemented payment systems compatible with Apple and Google platforms, ensuring a smooth and secure transaction process. Beyond development, I managed the app's publication on iOS and Android marketplaces, organized the server and hosting infrastructure, and deployed the official website for the app, ensuring a cohesive and reliable user experience across all platforms.
Reserve: Seamless Reservation Platform
As a full-stack developer, I developed both the front- and back-end components of the Reserve app. I designed and managed the database, ensuring data integrity and efficient query handling. I integrated the platform with Google Cloud for secure and scalable infrastructure and optimized the app for high performance across web and mobile platforms. Additionally, I handled the deployment process, ensuring the app was available for users on both web and mobile environments.
TinderOne: Dating App
https://play.google.com/store/apps/details?id=com.antiiiii.tinderoneAs a full-stack developer, I played a crucial role in building TinderOne. This captivating dating app combines the familiar swiping mechanism of Tinder with the added feature of sending virtual gifts, providing users with an enjoyable and engaging dating experience.
APY: NGO Website
https://apy.am/As a Full-stack Developer, I oversaw the website's back- and front-end development. My tasks included setting up the project infrastructure, designing and implementing the database, and ensuring seamless integration of the VPOS payment system for donations. I also conducted thorough testing to ensure reliability, organized the hosting and server setup, and deployed the website successfully. My contributions enabled APY's robust and user-friendly platform to achieve its goals effectively.
Autozone
https://apps.apple.com/am/app/autozone/id6474038080As a full-stack developer, my responsibilities encompassed the end-to-end development of Autozone. Utilizing React and Next.js, I crafted an intuitive and responsive front end, providing users with a seamless experience when accessing critical information about their vehicles. The back end, powered by Node.js and Nest.js, supported by MySQL and Prisma, ensures real-time data synchronization, secure user authentication, and efficient data storage.
Memodio: Medical App
https://play.google.com/store/apps/details?id=com.memodio.app&pcampaignid=web_shareIn my role as a full-stack developer, I contributed to the development of Memodio, focusing on creating a user-friendly and accessible platform. Utilizing technologies such as Flutter for the front end, and Node.js and Nest.js for the back end, I helped build a responsive and intuitive application. Additionally, I integrated Firebase for secure data management and user authentication, ensuring a seamless and safe experience for Memodio users.
Memodio represents a significant advancement in leveraging technology to support individuals with cognitive impairments, offering a holistic solution to enhance memory and cognitive function. My involvement as a full-stack developer was instrumental in realizing Memodio's mission.
Scholarship System | Multiplatform Scholarship Application
https://thescholarshipsystem.com/As a software developer for the Scholarship System, my role involved troubleshooting, maintaining, and enhancing the various components of the platform. I was responsible for ensuring that the web app, mobile apps, and Chrome extension functioned seamlessly, providing users with a reliable and user-friendly experience.
Stone Market: Online Stone Marketplace
https://stonemarket.am/hyAs the front-end developer on the Stone Market project, I created both the website and the admin panel. I used Nuxt.js 3 and Tailwind CSS for the website to build a fast and responsive front-end application leveraging Vue 3.
HayPost Pay: Bill Payment App
https://apps.apple.com/us/app/haypost-pay-wallet/id1553436505As the full-stack developer on the HayPost Pay project, I played a pivotal role in the front-end and back-end development processes. On the front-end side, I leveraged React Native, React, and Next.js to create a dynamic and intuitive mobile application interface. The application is designed for optimal user experience, allowing users to make instant payments seamlessly. Responsive design principles were implemented to ensure a consistent, user-friendly experience across various devices.
Polyglotte.am: Translation Tool
https://polyglotte.am/JackLeckerman: Meeting Organization Application
As a full-stack developer, my responsibilities encompassed the end-to-end development of JackLeckerman. Utilizing Flutter, I crafted a modern and user-friendly front end, providing an intuitive interface for users to organize and manage meetings seamlessly.
Solohaul Park: Business Website
As a full-stack developer on the Solohaul Park project, my responsibilities involved developing the website's front- and back-end components using TypeScript. On the front-end, I used React to build the user interface, leveraging the power of TypeScript to ensure type safety and code maintainability. I implemented interactive features and animations to enhance the user experience and create an engaging website.
Amaranoc.am: Real Estate Website
https://amaranoc.am/As a full-stack developer on this project, my responsibilities encompassed the seamless integration of technologies to deliver a user-friendly and visually appealing platform. Utilizing React and Next.js, I crafted a dynamic and responsive front end that aligns with the real estate industry's aesthetic and functional requirements.
Tiffi.store: eCommerce Platform
As a full-stack developer, my responsibilities encompassed the seamless integration of front- and back-end components to bring the Tiffi.store to life. Utilizing React and Next.js, I crafted an intuitive and responsive user interface, ensuring a visually appealing and consistent design across various devices. Tailwind, along with HTML and CSS, played a pivotal role in achieving a minimalist design that aligns with the modern aesthetic of the fashion industry.
Quit Dipping Bootcamp: App To Assist Individuals to Quit Smoking
https://play.google.com/store/apps/details?id=com.aimtech.dipstopAs a back-end engineer for the Quit Dipping Bootcamp project, my primary responsibilities involved the development of the server-side components of the application. I utilized NestJS, a powerful and scalable Node.js framework, to build the back-end API endpoints. Using TypeScript, I ensured type safety and code maintainability throughout the project.
Education
Bachelor's Degree in Informatics and Applied Mathematics
Yerevan State University - Yerevan, Armenia
Skills
Libraries/APIs
Node.js, React, Vue, REST APIs, Google Maps, Stripe, OpenAI API, Google Calendar API, WebRTC, React Navigation, Claude API, Google Maps API, Back-end APIs, jQuery, Socket.IO, Vuex, Redux-Saga, Redux Persist, Stripe API, eBay API, Google Places API, Google Translate API, Google Sheets API, Amazon Product Advertising API
Tools
Postman, Git, GitHub, NGINX, Figma, Expo, Claude Code, TestFlight, Claude, Figma to Webflow, Google Analytics, Amazon Elastic Container Service (ECS), Sentry, Prisma, Slack, GitLab, Jira, Redux Thunk, GitLab CI/CD, ChatGPT, Amazon Simple Queue Service (SQS), Amazon Simple Email Service (SES), Amazon Simple Notification Service (SNS), Firebase Authentication, Firebase Cloud Messaging (FCM), Codex, WebView, Celery, Terraform, Bitbucket, SQLyog, Auth0, Google Sheets, n8n, Shadcn, BigQuery
Languages
JavaScript, HTML, CSS, JavaScript 6, TypeScript, SQL, HTML5, Dart, Python, Swift, Go, Rust, Java, C#, SCSS, GraphQL, Kotlin, CSS3, Google Apps Script, Python 3
Frameworks
Redux, Next.js, Material UI, Express.js, Tailwind CSS, React Native, Flutter, Django, SwiftUI, Electron, UIKit, Ionic 4, NestJS, Quasar, Nuxt.js, LangGraph, gRPC, ReplayKit, NativeScript
Paradigms
Clean Code, Design Patterns, JavaScript Design Patterns, Mobile App Design, DevOps, Mobile Development, HTML DOM, Testing, UX Design, UI Design, Cross-platform, B2B, Microservices, Database Design, Low-code Development, Real-time Systems, HIPAA Compliance, Marketplace Platforms, Search Engine Optimization (SEO), Role-based Access Control (RBAC), Model Context Protocol (MCP)
Platforms
Visual Studio Code (VS Code), Linux, Amazon Web Services (AWS), Firebase, Google Cloud Platform (GCP), Android, iOS, FlutterFlow, Mobile, AWS Lambda, Azure, Mapbox, Web, Twilio, Kubernetes, Keychain, Docker, Vercel, LiveKit, Replit, Google Ads
Storage
MySQL, MongoDB, Databases, PostgreSQL, DB, Amazon S3 (AWS S3), SQLite, Database Management, Cloud Firestore, Redis, Google Cloud
Industry Expertise
Healthcare, Project Management
Other
Algorithms, Data Structures, APIs, Web App Development, Online Payments, Responsive UI, Responsive Design, Mobile App Development, Websites, Full-stack, Full-stack Development, Mobile Apps, Dating Apps, Payment APIs, Artificial Intelligence (AI), API Integration, Web Development, CI/CD Pipelines, PWA, Web Hosting, Minimum Viable Product (MVP), Technical Leadership, Scalability, Leadership, Front-end, Mobile UX, Authentication, Browser Automation, Web App Automation, User Experience (UX), WebSockets, Live Chat, Messaging, eCommerce, Version Control, Mobile First, CTO, Back-end, User Interface (UI), Front-end Development, English, Exercise & Fitness, Fitness, Architecture, Scraping, AI Integration, Hybrid Apps, Mobile Applications, App Store, App Store Acceptance Process, Billing Systems, Google Play Store, MERN Stack, Social Media Integration, Payment Gateways, Videos, Integration, AI Tools, QR Codes, Large Language Models (LLMs), Supabase, MySQL Data Access Components (MyDAC), Health, Software Architecture, Communication, Software Development, Security, AI-generated Code, Agentic AI, Cloud Infrastructure, System Architecture, Production QA, Vibe Coding, IT Audits, PostgreSQL 9, Infrastructure, Tailwind UI, Framer, Debugging, LLM Integration, Third-party APIs, Dashboards, Code Auditing, Code Review, OAuth, Serverless, Webhooks, IT Security, Feature Analysis, RESTFul APIs, Modular, Agentic Coding, Supabase Auth, General Data Protection Regulation (GDPR), Gemini API, AWS Cloud Architecture, Async/Await, Push Notifications, Marketplaces, Website Performance, Computer Science, SaaS, Cloud Storage, Software Engineering, Cloud Architecture, Site Reliability Engineering (SRE), Observability, Lovable, Resend, Bun, AI Agent Orchestration, LLM Agents, Cross-platform App Development, Native Mobile Apps, Chatbots, Notifications, Real-time Streaming, Real-time Tracking, Streaming, Video Streaming, Event Streaming, Electronic Health Records (EHR), Healthcare Software, Open Source, Anthropic, Figma to React, Single Sign-on (SSO), Generative Artificial Intelligence (GenAI), Workflow, Technical Architecture, Training, Education Technology (Edtech), Platforms, Attendance Systems, Web Scraping, OpenAI, OpenAI GPT-3 API, OpenAI GPT-4 API, Chrome Extensions, Google, CRM APIs, Data Scraping, Website Data Scraping, Data Engineering, FastAPI, AI Agents, Financial APIs, Fly.io, eBay Listings, Gemini, Microsoft Azure, AI Automation, Retrieval-augmented Generation (RAG), HIPAA, Vite, Concurrency, Performance, Healthtech, Calendars, Firebase Cloud Functions, AI-assisted Development, Fintech, SQL Server, LangChain, Logistics, Order Management, Shipping, Payments, Email, Problem Solving, Product Management, Digital Design, Axios, Smart Contracts, Google In-app Billing, AI Model Integration, VPOS, AI Algorithms, API Design, Big Data, Meta Ads, Agentic RAG Systems, Systems Design, Performance Optimization, RAG Systems, Perplexity
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