Bewton's Portfolio

Bewton Maina

Full Stack Developer

About Me

A Full Stack Developer with experience leading cross-functional teams to deliver scalable platforms using Next.js, NestJS, and PostgreSQL. I have built Web2 and Web3 systems including AI-assisted tools, marketplaces, and blockchain integrations, with a focus on system design, performance, and reliability.

What I Do

Frontend Developer

Design and build responsive, intuitive interfaces using React and Next.js with strong attention to user experience and accessibility.

Backend Developer

Build secure, performant APIs and scalable backend systems using NestJS, PostgreSQL, Redis, and containerized environments.

Web3 & Blockchain Developer

Develop smart contract–powered systems on Cardano using Aiken and integrate on-chain logic with modern web applications.

Skills

HTML

Javascript

CSS

React

Typescript

SQL

MongoDB

NodeJS

ExpressJS

NestJS

NextJS

SocketIO

Docker

Git

HTML

Javascript

CSS

React

Typescript

SQL

MongoDB

NodeJS

ExpressJS

NestJS

NextJS

SocketIO

Docker

Git

HTML

Javascript

CSS

React

Typescript

SQL

MongoDB

NodeJS

ExpressJS

NestJS

NextJS

SocketIO

Docker

Git

Who I've Worked With

Building the future of Web3 and decentralized technologies

Etho

Project Technical Lead

Oct 2025 - Present

Leading a team to build an ethical marketplace sourcing products from indie brands, with a focus on responsible sourcing, mobile accessibility, and SEO performance.

Building a transparent ethical product marketplace

Key Achievements:

Led a team of 3 (AI Engineer, Designer, Full Stack Developer) to build an ethical marketplace
Built a multi-stage ingestion pipeline for scraping and ethical product tagging using Redis
Developed responsive Next.js interfaces with improved mobile accessibility and SEO performance
Deployed on AWS with CI/CD pipelines enabling continuous deployment and safe rollbacks

Technologies Used:

Next.jsNestJSPostgreSQLRedisAWSTypeScriptDocker

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LidoNation

Full Stack Developer Intern

Jan 2024 - Nov 2024

Built the majority of the frontend and backend systems for 1694.io, a governance platform supporting Cardano's Voltaire initiative.

Advancing Cardano's Voltaire Era

Key Achievements:

Built the majority of the frontend and backend systems for 1694.io
Designed and implemented core application flows using Next.js and NestJS
Orchestrated ingestion of blockchain transactions as events using Kafka
Refactored data models using TypeORM and PostgreSQL for improved scalability
Containerised development environments with Docker, reducing setup time by ~40%
Improved performance by ~25–30% through code-splitting and SEO optimisations

Technologies Used:

TypeScriptNext.jsNestJSTypeORMPostgreSQLDockerKafka

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Tally

Full Stack Developer Intern

Aug 2023 - Jul 2024

Built a notifications system that increased user engagement, developed GraphQL APIs with authentication and rate limiting, and implemented background workers for Discourse integration.

~15–20% increase in user engagement

Key Achievements:

Built a notifications system, increasing user engagement by ~15–20%
Developed GraphQL APIs with authentication and rate limiting
Implemented background workers for Discourse integration using cron jobs
Managed data models using MongoDB and Mongoose

Technologies Used:

Node.jsMongoDBMongooseGraphQLDiscourse APICron JobsJavaScript

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Fusion (Fusewith.me)

Part-Time Maintainer

Feb 2025 - Oct 2025

Maintained and enhanced a service-selling platform, improving user experience and authentication security.

Streamlined platform usability and performance

Key Achievements:

Fixed critical bugs and improved overall UI/UX flow
Implemented session-based user authentication using Redis for state management
Optimized API performance for service listings and checkout
Contributed to deployment stability and QA testing

Technologies Used:

Next.jsNode.jsExpress.jsRedisMongoDBTypeScriptDocker

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DirectEd Investor Platform

Smart Contract & Backend Developer

Jan 2025 - Apr 2025

Built backend logic linking investor contributions to on-chain smart contracts written in Aiken, ensuring accurate ROI distribution aligned with contribution ratios.

Introduced smart contract–driven transparency to micro-investments

Key Achievements:

Built backend logic linking investor contributions to on-chain smart contracts written in Aiken
Ensured accurate ROI distribution aligned with contribution ratios
Optimised API-to-contract interactions, improving transaction efficiency
Collaborated with blockchain engineers to validate contract behaviour
Deployed on Azure with CI/CD integration

Technologies Used:

AikenCardanoNext.jsNestJSPostgreSQLTypeScriptAzure

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Event Simplified

Project Technical Lead

Oct 2024 - Mar 2025

Led a cross-functional team of 5 to build an AI-assisted event management platform, designing system architecture across Next.js, NestJS, and Python AI services.

Key Achievements:

Led a team of 5 to build an AI-assisted event management platform
Designed system architecture across Next.js frontend, NestJS backend, and Python AI services
Implemented CI/CD pipelines using AWS CodeBuild and CodePipeline for continuous delivery
Resolved API timeout constraint due to Cloudflare by introducing a polling-based request model

Technologies Used:

Next.jsNestJSPostgreSQLAWS CodePipelinePythonTypeScriptAI/ML

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FitCheck

Backend Developer

Aug 2024 - Dec 2024

Developed a fit-matching algorithm comparing user measurements with clothing data, improving accuracy and reducing redundant computations.

~10% accuracy improvement and ~20% performance gain

Key Achievements:

Developed a fit-matching algorithm comparing user measurements with clothing data
Improved accuracy by ~8–10% through refined calculations and PoseNet integration
Reduced redundant computations by ~20%, improving overall performance

Technologies Used:

Node.jsTensorFlow.jsPoseNetJavaScriptTypeScript

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Tick-lish

Project Technical Lead

May 2025 - Dec 2025

Led a team of 3 to build a ticket-selling platform focused on simplified event onboarding and secure payment integration.

Building a seamless ticketing experience for event creators and attendees

Key Achievements:

Led a team of 3 to build a ticket-selling platform focused on simplified event onboarding
Integrated Stripe payments and implemented role-based access control using NestJS
Built a responsive frontend with strong mobile usability
Deployed on Render using VPC isolation to secure internal services
Implemented CI/CD pipelines for reliable releases and rollback support

Technologies Used:

Next.jsNestJSMongoDBStripeTypeScriptNode.jsDocker

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Hobbies

Reading, Coding, Biking, Badminton

Languages

Swahili (native), English (fluent, IELTS C1), Japanese (elementary)

Projects & Companies

Years of Experience

Web3

Specialization