I solve problems
with technology.
7+ years transforming complex requirements into scalable digital products. Technology is chosen to fit the client's needs, not the other way round.
Eduardo R. Vargas
Dev Sênior · Tech Lead · Arquiteto
How I work
I'm Eduardo — I solve problems with technology.
7+ years delivering software in startups, fintechs, public sector and industry. I work as a senior full-stack developer, tech lead and architect, always focused on the business problem, not technology for its own sake. Stack-agnostic: Flutter, React, Next.js, Node.js, Python, hardware and whatever makes sense for the solution. From MVP to enterprise systems.
Industries I've worked in
Reply within 48 business hours.
Code is the end of the story. The beginning is understanding the problem.
Every project starts with questions, not code. That's the difference between delivering what was asked and delivering what was needed.
Diagnose before typing
The problem must be clear before the first line of code. This step saves weeks of rework.
Architecture that scales
Technical decisions built to last, without over-engineering or unnecessary technical debt.
Delivery without drama
Direct communication, managed scope and respected deadlines. The code works; the project closes.
that's how every service starts
What I do
End-to-end solutions from design to deployment, focused on quality and results.
Software Architecture
Scalable system design, MVP modelling, stack definition and complex ecosystems. From whiteboard to production code.
Full-Stack Development
Web, mobile and integrations. Technology is chosen based on the client's needs.
Tech Lead & Mentoring
Technical team leadership, code review, standard-setting and development of junior and mid-level developers.
Performance & SEO
Core Web Vitals optimisation, technical SEO, schema markup and AEO/GEO strategies for AI and search engine ranking.
Case Studies & Projects
Real solutions delivered for real clients.
Positivo Casa Inteligente
App de casa inteligente para controle de dispositivos IoT via Bluetooth e Wi-Fi com SDK Tuya.
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Doutor na Net
Plataforma de telemedicina com consultas por videochamada, prescrição digital e pagamento integrado.
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Tá Entregue
Three integrated delivery apps: customer, partner (merchant) and courier.
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Portal Cidadão DNIT
App de transparência pública para acompanhamento de obras rodoviárias federais com mapa interativo.
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SUPRA DNIT
Plataforma para gestão e execução de obras rodoviárias, aquaviárias e ferroviárias do DNIT.
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Quem Concerta
Marketplace conectando prestadores de serviços residenciais a clientes com agendamento, chat e avaliações.
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Kidos Go & Professor
App de segurança escolar com check-in via QR Code, comunicação pais-escola e painel para professores.
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Meditorando
App de meditação com trilhas guiadas por áudio, diário de gratidão e acompanhamento de progresso.
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9x4 Educação
App gamificado para aprendizado de tabuada com desafios cronometrados e ranking de alunos.
PlayShorts
Plataforma de vídeos curtos educacionais com player customizado, upload por usuários e busca em tempo real.
Véspera
LP de produto premium com storytelling visual, specs técnicas e pré-venda para fone de ouvido de luxo.
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Vértice Arquitetura
Site de escritório de arquitetura com portfólio de projetos, galeria de obras e página de contato.
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Momentum AI
Landing page de alta conversão para startup de IA com seções de produto, pricing e CTA orientado a resultado.
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Conexão Digital 2026
Página de evento digital com countdown animado, programação, palestrantes e sistema de inscrições.
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Projeto Raiz
Site para ONG com apresentação de projetos sociais, captação de doações e área de voluntariado.
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Igreja da Esperança
Site institucional com galeria de fotos, localização e formulário de contato integrado ao Firebase.
View detailsProfessional Journey
7+ years building digital products in startups, banks and government agencies.
StarNorte Tecnologia
Desenvolvedor Mobile Sênior
Desenvolvimento mobile multiplataforma com Flutter para aplicativos B2C e B2B. Liderança técnica de squad, code reviews, arquitetura de features e mentoria de devs júnior e pleno.
Devvo Tecnologia
Especialista Flutter — Doutor na Net MVP
Desenvolvimento do MVP do app de telemedicina Doutor na Net. Integração de videochamada, pagamentos e prescrição digital, com entrega em prazo acelerado.
NTT DATA
Especialista Flutter — Prudential do Brasil
Especialista Flutter alocado na Prudential do Brasil para desenvolvimento e manutenção do app móvel de seguros, com foco em qualidade e cobertura de testes.
SISCON
Desenvolvedor Full-Stack — DNIT
Desenvolvimento e manutenção do sistema SUPRA — plataforma administrativa para gestão e execução de obras de engenharia rodoviária, aquaviária e ferroviária do DNIT. Responsável por frontend, backend e banco de dados.
Snowman Labs
Desenvolvedor Mobile Pleno
Desenvolvimento mobile para clientes fintech e varejo com Flutter e React Native. Squads ágeis com Scrum, entregas quinzenais e foco em performance de produto.
Falconi
Analista / Desenvolvedor Mobile
Desenvolvimento de app mobile para projetos de consultoria de gestão empresarial, com foco em performance, coleta de dados de field e UX para usuários não técnicos.
Dynatest
Analista / Desenvolvedor Mobile
Desenvolvimento de app para coleta de dados de infraestrutura rodoviária com integração de hardware via Bluetooth e TCP/IP para equipamentos de medição.
BRB — Banco de Brasília
Estagiário / Analista de Sistemas
Análise e desenvolvimento de sistemas internos do banco, com projetos de Machine Learning para análise de risco de crédito usando Python e Django.
Orbistec
Estagiário de Engenharia de Software
Primeiro estágio formal em desenvolvimento de software. Trabalho com React Native, Kotlin e Swift para desenvolvimento de apps mobile e APIs REST.
Frequently Asked Questions
Quick answers to the most common questions before we start working together.
I'm tech-agnostic by philosophy: technology is chosen to fit the client's needs, not market trends. I analyse the problem, context, team and available resources before defining any stack. I've worked with Flutter, React Native, Next.js, Node.js, Python and even hardware integrations — always with the same principle: what's the best solution for this specific case?
It means I don't just deliver code — I deliver technical decisions. I design system architectures, define quality standards, review code, mentor junior teams and bridge the technical conversation with stakeholders and PMs. With 7+ years of experience, I can anticipate problems before they become production bugs and help products scale safely.
I work from MVP to mature systems: mobile apps (Flutter, React Native), web systems and sites (Next.js, React), advanced data visualisation dashboards (Three.js), hardware and IoT integrations, government SaaS and fintechs. I've worked in health, logistics, education, public sector, fintech and industry.
I work on a project basis (fixed scope, timeline and price), hourly/monthly (part-time or full-time dedication) or as an embedded tech lead within an existing team. Larger projects can start with a discovery phase (architecture and planning), resulting in precise scope and reliable estimates.
Fill in the contact form below or send a message on WhatsApp/LinkedIn. I reply within 48 business hours to schedule an initial 30-minute call — no commitment — to understand the project, assess the fit and propose the next steps.
Let's talk.
Tell me about your project. I'll reply within 48 business hours.
Reply within 48 business hours. Startups, companies and freelance projects.