dcoder.
Software Engineering
13 years building software that stays in production. Six clients running today — marketplaces, industrial platforms, automation. You talk straight to the engineer who builds it.
// what we build
Custom software,
built end to end.
From idea to production — straight with the team that builds it. No middlemen, no off-the-shelf.
Web apps · systems & SaaS · automation · AI agents · integrations · e-commerce · cloud & DevOps
Featured Work
Recent projects and solutions delivered.
Canoe — Boat Tour Marketplace
Marketplace for boat tours in Brazil with Stripe Connect payments, PWA, and multi-role management.
Quinta do Sol — Hotel & Gas Station Websites
Two custom WordPress sites for the same client: a hotel with live booking and a gas station with a fleet portal.
Shipyard
AI-native project management with Claude Code MCP integration, Git-aware Kanban boards, sub-repo detection, and multi-project support.
ChatMood
Real-time Twitch chat sentiment analysis with GPT-4o-mini, live dashboard, channel comparison, and Stripe subscription billing.
Consierge
WhatsApp AI customer service with admin panel: 6-category intent classification via GPT-4o-mini, SLA triage, team accounts, live takeover, multi-instance from day one.
GitFolio Premium
AI portfolio generator with Claude, GPT-4, and Gemini. Multi-platform OAuth and payments.
RadioGuess
Geography quiz with 153 countries, radio streaming, and Street View immersion.
Chatbot WhatsApp
Corporate WhatsApp bot for fleet fueling and HR with n8n workflows.
Rede Capanema — Multi-Vendor Marketplace
Multi-vendor marketplace with MercadoPago split payments and AI product creation.
Amachains Orde — Carbon Footprint Platform
Industrial carbon footprint platform with React Flow visual modeling, ISO 14044 allocation (Mass, FIFO, Production Orders), real-time collaboration and forward/reverse traceability.
Engineering solutions, one commit at a time
André Defrémont
DCODER is a software engineering studio founded by André Defrémont. Over a decade of experience building web applications, distributed systems, and delivering end-to-end solutions for clients.
Led by an engineer with a M.Sc. in Computer Science from UFPA. Six clients running systems in production today — from a marketplace with split payments to an industrial carbon footprint platform under ISO 14044.
Full-Stack Engineering
TypeScript, React, Vue.js, Node.js, Python, Next.js, Go, Java Spring Boot
Cloud & DevOps
Kubernetes, Docker, AWS, Helm, CI/CD pipelines, Microservices architecture
Applied AI
Agents on GPT-4o, Claude and Gemini, RAG, n8n automation running in production
API Integrations
ERP, CRM, payments, SharePoint, Google APIs, data pipelines
// founder_journey
André's career timeline
André's career timeline
A decade of engineering — from technical support to leading distributed systems and blockchain infrastructure for national-scale clients.
2020 — Present
Amachains
CIO & Full Stack Engineer
Built the platform for carbon credit management from scratch — PWAs with Vue.js, React.js, MERN stack. Managing AWS and Kubernetes deployments.
2024 — Feb 2026
RNP
Blockchain Software Engineer
Built and maintained Hyperledger-based networks for Brazil's national research and education infrastructure. Kubernetes, Helm, and Go.
2021 — 2023
UFPA
Master's in Computer Science — UFPA
Specialized in permissioned blockchain networks, Hyperledger Fabric, and distributed systems architecture.
2019 — 2020
Equilibrium Web
Full Stack Software Engineer
Developed and maintained AngularJS applications. Optimized Java legacy systems for improved performance and scalability.
2012 — 2019
XIFIX · UFPA
Full Stack Engineer · B.Sc. Information Systems
Progressed from technical support to full-stack development across React.js, Node.js, C#, and PHP. Bachelor's degree from UFPA with focus on Computer Networks and Blockchain.
CIO & Full Stack Engineer
Amachains
Built the platform for carbon credit management from scratch — PWAs with Vue.js, React.js, MERN stack. Managing AWS and Kubernetes deployments.
Blockchain Software Engineer
RNP
Built and maintained Hyperledger-based networks for Brazil's national research and education infrastructure. Kubernetes, Helm, and Go.
Master's in Computer Science
UFPA
Specialized in permissioned blockchain networks, Hyperledger Fabric, and distributed systems architecture.
Full Stack Software Engineer
Equilibrium Web
Developed and maintained AngularJS applications. Optimized Java legacy systems for improved performance and scalability.
Full Stack Engineer · B.Sc.
XIFIX · UFPA
Progressed from technical support to full-stack development across React.js, Node.js, C#, and PHP.
What People Say
"Excellent professional, exceeded expectations. Delivered far beyond what was agreed upon with impeccable quality. Very helpful with demands and adjustments."
MikroTik Hotspot · 2026
"One of the most talented and dedicated professionals I have ever collaborated with. His expertise in Node.js, React.js, blockchain, and Web3 technologies is impressive. His ability to manage both front-end and back-end is remarkable."
Web3 & Blockchain projects · Amachains
"I really liked André's work. Completed on time, excellent communication, full support and even did more than expected! I would hire again without a doubt!"
WordPress Migration · 2021
"As project manager, I saw firsthand his strong technical skills and commitment as a mobile developer. He not only met all requirements but also collaborated effectively. I highly recommend André for any development role."
Museu Goeldi Digital · UFPA
"I was always impressed by his professional vision, constantly ahead of its time. André is proactive, with a clear strategic vision and a unique talent for solving complex problems with efficiency and creativity."
XIFIX Tecnologia
"Excellent professional. Service fully delivered, within the established deadline!"
WhatsApp & SharePoint Bot · 2026
"Dedicated and highly skilled in software development. His strong work ethic and ability to learn quickly stood out. He approached challenges with a problem-solving mindset, ensuring the team's success."
RNP · Blockchain Infrastructure
"Everything excellent!!"
PDF Form Filler · 2026
"His abilities as a developer have always impressed me. I followed his journey in research, during which he completed his master's in Computer Science with a focus on Blockchain. He is certainly a great professional to have on the team."
Amachains · Product Team
"Very professional and helpful."
Web Scraping · 2021
"Exercises technical leadership that inspires reaching new heights of technology and innovation."
Cross-team collaboration
"Excellent professional! Without a doubt, I recommend!"
Landing Page
"Excellent professional, exceeded expectations. Delivered far beyond what was agreed upon with impeccable quality."
MikroTik Hotspot · 2026
"One of the most talented and dedicated professionals I have ever collaborated with. His expertise in Node.js, React.js, blockchain, and Web3 technologies is impressive."
Web3 & Blockchain · Amachains
"Completed on time, excellent communication, full support and even did more than expected! I would hire again without a doubt!"
WordPress Migration · 2021
"I was always impressed by his professional vision, constantly ahead of its time. André is proactive, with a unique talent for solving complex problems with creativity."
XIFIX Tecnologia
"Excellent professional. Service fully delivered, within the established deadline!"
WhatsApp Bot · 2026
"Exercises technical leadership that inspires reaching new heights of technology and innovation."
Cross-team collaboration
Let's build something great.
Open for software development projects, technical consulting, and technology partnerships.
Serving clients remotely worldwide