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Leandro Gehlen

@leandrogehlen

Full-Stack Engineer at NSD Tecnologia building a real-time options trading app with live market data and order execution.

Brazil

Message

What I'm looking for

I'm focused on GTM engineering—connecting CRM, billing, and marketing data programmatically so revenue teams can trust their numbers.

At NSD Tecnologia, I built a mobile-first options trading application with live market data, multi-JWT authentication, and order execution with electronic signature. I also delivered active-position monitoring and statistics dashboards.

At Vive Saúde, I shipped applications with NestJS and Next.js, integrated payment gateways and third-party APIs, and maintained production deployments. I also refactored AI-generated applications into maintainable code.

Before moving into software engineering, I sold financial products at Banco do Brasil and founded Lucky Dives. That experience informs my current focus on GTM engineering: connecting CRM, billing, and marketing data so revenue teams can trust their numbers.

Experience

Work history, roles, and key accomplishments

Current

Full-Stack Developer

Current

NSD Tecnologia

Nov 2025 - Present (11 months)

Built an options trading application with React 19, TypeScript, Vite, and Zustand, mobile-first with dark mode. Integrated real-time market data over WebSocket (STOMP/SockJS) and implemented multi-JWT authentication and order execution with electronic signature.

React TypeScript Vite Zustand WebSockets STOMP SockJS JWT Authentication Trading Platforms

Full-Stack Developer

Vive Saúde

Jan 2025 - Nov 2025 (10 months)

Built and shipped end-to-end applications with NestJS/Node.js and Next.js/React. Integrated payment gateways and third-party APIs, configured servers, managed deployments, and refactored AI-generated applications into production-ready code.

NestJS NodeJS Next.js React Payment Gateways API Integration Server Configuration Deployment Refactoring

Backend Developer (Mid-level)

ICA Bank

Mar 2023 - Aug 2023 (5 months)

Integrated a NestJS backend with a payment API and implemented email-based account verification and password recovery flows.

NestJS Payment APIs Email Verification Password Recovery

Freelance Software Developer

Self-employed

May 2021 - Apr 2023 (1 year 11 months)

Delivered scoped solutions for business clients, translating business needs into technical solutions on defined timelines. Built features and frontend interfaces with modern JavaScript frameworks and integrated APIs with third-party services.

JavaScript Frontend Development API Integration Third Party Providers Bug fixing Performance Optimization

CEO & Founder

Lucky Dives

May 2018 - May 2021 (3 years)

Led a startup end to end, including product roadmap, prioritization, budget, and timelines. Coordinated developers and designers to turn business requirements into working features and handled stakeholder communication and operational decisions.

Product Management Roadmapping Budgeting Team Coordination Stakeholder Management Leadership