Available for new opportunities
Marcus Sena
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Building scalable infrastructure, automation, and full-stack solutions. Full-Stack Software Engineer specialized in high-performance ecosystems.
{developer}
Software engineer with +5 years of experience building SaaS platforms, AI agents and automations that scale. Currently leading full-stack architecture at L0GIK, where I deliver systems used by 10,000+ users daily. Obsessed with DX, performance, and self-maintaining code.
Next.js
React
TypeScript
Node.js
n8n
Gemini API
PostgreSQL
Prisma
Tailwind CSS
Evolution API
Docker
GitHub Actions
Zod
REST APIs
LLMs
VPS Deploy
Next.js
React
TypeScript
Node.js
n8n
Gemini API
PostgreSQL
Prisma
Tailwind CSS
Evolution API
Docker
GitHub Actions
Zod
REST APIs
LLMs
VPS Deploy
Selected Work
Featured Projects
01
3 photos
SaaS / AI
UaiMailer - AI Email Builder SaaS
AI-powered Email Marketing Builder using Gemini.
Automated HTML generation from design files
Next.jsNode.jsGemini APIUploadthingReact
View project→Click to explore
02
5 photos
+1
Backend / Workflow
Cardan Sete - Gestão de O.S. Automotiva
Management Platform with WhatsApp automation via Evolution API.
Automated flow with digital signatures
WordPressn8nEvolution APIGoogle Drive APIPHP
View project→Click to explore
03
2 photos
AI Agents
Marvin MS Dev - Agente IA WhatsApp
AI Virtual Assistant for B2B lead qualification.
Real-time qualification, response in seconds
Evolution APIn8nLLMVPSNode.js
View project→Click to explore
04
3 photos
Data
Growth Engine POC
Lead capture system with resilient webhooks and LGPD compliance.
24 automated tests, LGPD compliant
Next.jsTypeScriptPrismaPostgreSQLZodCI/CD+2
🚧 Coming soonClick to explore
Journey
From community projects to scalable systems serving thousands.
2024 – Present
Senior Software Developer
L0GIK
TypeScript, React, Next.js, Node.js — architecting scalable APIs for 10K+ daily users, AI agents with n8n + Evolution API, payment gateways (PIX, card), advanced tracking (GA4/GTM/Meta Pixel) and architecture focused on resilience and performance.
2022 – 2024
Mid-Level Software Developer
L0GIK
HTML/CSS/JS, Vue.js, deep CRM integrations (Salesforce, HubSpot, RD Station), Google Sheets and SMTP. Responsive email templates, deploy/QA, CMS maintenance (WordPress, Drupal, AEM, Shopify).
2020 – 2022
Entry-Level Front-End Developer
Newbies Developer Community
Intensive training in modern JavaScript, community open-source projects, code reviews and collaborative learning in HTML, CSS and JS.
Under NDA
Corporate Experience
Projects under NDA — no screenshots, but full tech details.
🔒 AI Agents
Agentes IA + Integração CRM
Conversational AI agents for customer service and lead qualification at scale, connected to corporate CRMs.
Node.jsTypeScriptn8nLLMSalesforceHubSpotRD Station
🔒 Analytics / Data
Tagueamento Completo de E-commerces
End-to-end tracking infrastructure for GA4, Google Ads and Meta Pixel with server-side conversions.
GTMGA4Google AdsMeta PixelDataLayerJavaScriptGTM Server
🔒 Architecture
Dashboards com Microgerenciadores
Node.js workers that collect, process and feed executive dashboards in real-time.
Node.jsTypeScriptPostgreSQLWorkersREST APISlack
🔒 Automation
Automações n8n para Processos Humanos
Complex n8n workflows that replaced entire manual routines, triggered by cron and webhooks.
n8nWebhooksREST APIGoogle SheetsSlackSMTP
🔒 Architecture
Enterprise API Integrations
Data orchestration between multiple CRMs, databases and corporate REST APIs with high availability.
n8nNode.jsTypeScriptREST APIPostgreSQLDocker
// white_hat
>Security First_
Every line of code is written with security in mind.
security_policy.sh
$ I build systems with OWASP Top 10 awareness, input sanitization, parameterized queries, and principle of least privilege. Pentesting mindset from development to deployment.
01
OWASP Top 10
Protection against injection, XSS, CSRF, broken auth, and misconfigurations.
02
Pentest Mindset
I think like an attacker so your system doesn't have to face one unprepared.
03
Data Protection
LGPD/GDPR compliance, encrypted storage, and secure token handling.
04
Secure Architecture
Rate limiting, WAF rules, CSP headers, and zero-trust API design.
// data_pipeline
Data Engineering
Collecting, transforming, and delivering data with precision and security.
SOURCE→EXTRACT→TRANSFORM→LOAD→DELIVER
⚡
Workers & Microservices
Node.js workers that collect, process, and feed real-time dashboards with resilient queues.
🔄
ETL Pipelines
Automated extraction, transformation, and loading from multiple sources into data lakes and warehouses.
🛡️
Secure Data Injection
Parameterized queries, input validation at every layer, and encrypted data transport to databases.
📊
CRM Data Orchestration
Bidirectional sync with Salesforce, HubSpot, and RD Station — enriching leads and feeding analytics.
🔗
Webhook Resilience
Retry policies, dead-letter queues, and idempotent processing for zero data loss.
📈
Tracking & Analytics
GA4, GTM Server-Side, Meta CAPI — server-to-server event pipelines with full data ownership.
Let's Talk
Interested? Get in touch — I respond within 24h.