Daves Portfolio

Summary:

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• 10 years of experience building production-grade, end-to-end systems across startup and enterprise environments.

• Specialized in modern frontends with React, Next.js, Angular, Android(Java, Kotlin), iOS(Swift, SwiftUI, Objective-c), Flutter and React Native scalable backends with Node.js, Python/Django, C# Asp.Net, .Net Core and Java/Spring Boot, and AI-powered workflows using LLMs, LangChain, and automation tools.

• Strong focus on cloud-native architecture, CI/CD pipelines, and delivering measurable business value

     Professional Experience

Senior Full-Stack Engineer | Vetly | NY, USA (Remote)

Aug. 2025 ~ May. 2026

•  Developed scalable full-stack applications, leading frontend engineering (Next.js, TypeScript, Tailwind CS, shadcn/ui, Radix UI, Material UI) and backend development (NestJS, PostgreSQL) for enterprise-grade solutions, improving UI consistency by 30% and reducing page load times by 35%.

• Built responsive, reusable UI components, designed secure RESTful APIs, and optimized database queries, improving application performance by 40% and reducing API response times by 30%.

• Collaborated with cross-functional teams to deliver production-ready features, accelerating developmen, velocity by 25% while maintaining scalable architecture and clean code practices.

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Technologies : Next.js, NestJS, TypeScript, Tailwind CSS, PostgreSQL, shadcn/ui, Radix UI, Material UI, REST APIs, Docker, AWS / GCP, Git

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Senior Full-Stack Engineer | LimeSurvey | Hamburg, Germany (Remote)

Jan. 2024 ~ Jul. 2025

• Contributed to an open-source survey platform by developing backend features with Python/Django and frontend applications with React and Storybook, helping improve development efficiency by 20%.

• Built responsive React interfaces for survey creation, response management, and data visualization, improving user workflow efficiency by 30% and reducing page load times by 35%.

• Integrated AI-powered features, including sentiment analysis, question recommendations, and response clustering, reducing manual data review by 50% and accelerating insight generation by 40%.

• Optimized backend APIs and survey processing logic, improving system performance by 30% and ensuring reliable processing of large-scale survey data under high concurrency.

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Technologies : React.js, Python/Django, Storybook, Tailwind CSS, Bootstrap, jQuery, Docker, Composer, PHP

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Junior Mobile & Web Developer | nSoft Laundr System | Manila, Philippines(Remote) 

Nov. 2022 ~ Dec. 2023

• Contributed to an open-source survey platform by developing backend features with Python/Django and frontend applications with React and Storybook, helping improve development efficiency by 20%.

• Built responsive React interfaces for survey creation, response management, and data visualization, improving user workflow efficiency by 30% and reducing page load times by 35%.

• Integrated AI-powered features, including sentiment analysis, question recommendations, and response clustering, reducing manual data review by 50% and accelerating insight generation by 40%.

• Optimized backend APIs and survey processing logic, improving system performance by 30% and ensuring reliable processing of large-scale survey data under high concurrency.

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Technologies : Node.js, TypeScript, SQLite,  Android(Java), iOS(Swift), MySQL, Bootstrap, jQuery

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Frontend Developer | TheTrackApp | NY, USA (Remote)

Sep. 2021 ~ Oct. 2022

• Developed a digital memorial platform using Next.js, TypeScript, and Chakra UI, enabling families to create personalized memorial pages with photos, videos, and tributes.

• Built responsive, accessible, and SEO-optimized features while integrating APIs for media uploads, digital guestbooks, maps, and kiosk displays, improving page load speed by 35% and user engagement by 30%.

• Collaborated with backend and design teams to deliver a secure, high-performance platform while ensuring data privacy and reliability.

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Technologies : React.js, Node.js, Electron, TypeScript, SQLite, Material UI, Redux, WebRTC

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Backend Developer | AlphaSwap | London, UK (Remote)

Jun. 2019 ~ May. 2021

• Built and maintained backend services for a Data-as-a-Service platform using Nest.js, PostgreSQL, REST APIs, and GraphQL, while developing APIs for real-time stock data, portfolio analytics, and user activity, improving data processing consistency by 24% and reducing response latency by 31%.

• Optimized PostgreSQL queries and database schemas while collaborating with React and Next.js developers to deliver responsive, data-driven features, improving data retrieval performance by 28% and feature delivery efficiency by 18%.

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Technologies : React.js, Next.js, NestJS, PosgreSQL, easy-peasy, RestFul API, GraphQL

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Mobile Developer | Myeloma Canada | Canada (Remote)

Jan. 2018 ~ Apr. 2019

• Developed a healthcare platform for multiple myeloma management using React Native, enabling secure patient data management and treatment tracking.

• Built responsive web and mobile features with Android and iOS support, integrating REST APIs to improve clinical workflows and user experience by 30%.

• Collaborated with cross-functional teams to deliver a secure, scalable, and HIPAA-conscious application with optimized performance and reliability.

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Technologies : Node.js, TypeScript, React Native, MySql, jQuery, Javascript, Android, iOS, UWP