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Alfredo Barrera

@alfredobarrera

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Senior Full Stack Developer specializing in scalable web, mobile, AI, and blockchain solutions.

Philippines

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What I'm looking for

I seek roles where I can build scalable web/mobile and blockchain products, lead technical design, work in Agile teams, use modern stacks, and drive end-to-end delivery.

I am a results-driven Senior Full Stack Developer with eight years building scalable web and mobile applications, delivering high-performance solutions across frontend, backend, and blockchain stacks.

I design and implement robust backend architectures using Node.js, Nest.js, GraphQL, and relational and NoSQL databases, while crafting responsive user interfaces with React, Next.js, and modern styling frameworks.

I have shipped native iOS apps with Swift and SwiftUI, integrated AI and RAG systems, and implemented blockchain features using Solidity, Rust, Web3 libraries, and multiple wallet integrations.

I work effectively in Agile teams, emphasize maintainable code, CI/CD, and cloud deployments (AWS/GCP/Azure), and consistently lead projects from concept to production with a focus on performance and reliability.

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Experience

Work history, roles, and key accomplishments

Senior Full Stack Developer

PQS Software

Jan 2024 - Dec 2024 (11 months)

Developed and integrated AI-based modules and RAG functionality into the tax platform, engineered prompt-based solutions and integrated OpenAI/Anthropic APIs to improve tax-query resolution and performance.

TypeScript NestJS RAG MySQL Integration

iOS App Developer

Solve.Care Foundation

Apr 2022 - Dec 2023 (1 year 8 months)

Built a SwiftUI MVVM iOS app with Core Data, async/await networking, social sign-in, blockchain integrations (Web3swift, TrustWalletCore) and BinancePay support to enable secure healthcare transactions.

Swift SwiftUI MVVM Core Data

Senior Full Stack Developer

BXDX

May 2021 - Apr 2022 (11 months)

Developed a Next.js/Tailwind front-end and integrated multiple crypto wallets, implemented BRC20/Runes inscription flows and a Bitcoin fee tracker to support an ordinals marketplace.

Next.js Tailwind BRC20 Runes

iOS App Developer

School Hack AI

Jan 2020 - Apr 2021 (1 year 3 months)

Developed Swift/SwiftUI iOS app with MVVM, implemented media upload via Cloudinary, real-time chat and ChatGPT-powered writing tools to enhance user engagement and learning workflows.

Swift SwiftUI MVVM Cloudinary

Senior Full Stack Developer

HoneyChat

Mar 2019 - Dec 2019 (9 months)

Built a responsive Next.js/TypeScript frontend and scalable Nest.js backend on Azure, integrated Web3Auth/NextAuth for secure social login and implemented real-time chat via sockets.

Next.js TypeScript Nest Azure

Senior Full Stack Developer

WAAT

Jan 2018 - Feb 2019 (1 year 1 month)

Delivered end-to-end features and platform optimizations using React, Node.js and GraphQL, supported long-term projects with an MVP-driven approach and introduced technologies like Redis and TypeScript.

React Node GraphQL MongoDB

Full Stack Developer

NorthOne

Feb 2016 - Dec 2017 (1 year 10 months)

Built financial product features across frontend and backend using TypeScript, React and Node.js, and implemented AWS serverless components (Lambdas, EventBridge, DynamoDB) to ensure reliability and scalability.

TypeScript React Node AWS Lambda