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Marcus Silva

@marcussilva1

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Senior full-stack engineer building scalable React and Node.js microservices.

Brazil

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What I'm looking for

I’m looking for a team where I can build high-availability web platforms using React, Node.js, microservices, and AWS—owning architecture, performance, and event-driven reliability while mentoring and shipping measurable improvements.

I’m a Senior Full Stack Developer with 10+ years of experience building and scaling production web applications. I specialize in React on the frontend and Node.js on the backend, with deep expertise in microservices, event-driven architecture, and performance optimization.

At Klaviyo, I led full-stack development of high-traffic CRM and operations platforms in a cloud-native AWS environment, supporting 1M+ daily requests. I architected React SPA dashboards with Redux Toolkit, React Query, and real-time WebSocket feeds, and built Node.js microservices (Express/NestJS) for CRM workflows and customer data orchestration using async event-driven patterns.

I’m hands-on with scalable API delivery—designing REST and GraphQL APIs with contract-first OpenAPI specs to enforce schema alignment—and I focus on reliability through event-driven pipelines (Kafka), background processing (Bull/Redis), and query tuning for PostgreSQL and MongoDB. I also value team impact: I’ve mentored junior engineers on Node.js async patterns, React component architecture, and API design best practices.

Experience

Work history, roles, and key accomplishments

Senior Full Stack Engineer

Klaviyo

Jun 2021 - Apr 2026 (4 years 10 months)

Led full-stack development of high-traffic CRM and operations platforms using React and Node.js microservices handling 1M+ daily requests. Architected React dashboards and real-time WebSocket feeds, and built Express/NestJS microservices with Kafka event-driven pipelines and Bull/Redis queues in an AWS ECS/EKS Kubernetes environment.

React Redux toolkit React Query WebSockets NestJS Kafka AWS ECS Kubernetes

Full Stack Developer

Firework

Oct 2018 - Jan 2021 (2 years 3 months)

Built React (TypeScript) dashboards and Node.js/NestJS microservices for FinTech platforms, delivering real-time reporting and high-throughput transaction APIs. Migrated a legacy monolith to async microservices to improve throughput, and implemented JWT/OAuth2 authentication, RBAC, and Jest/Supertest coverage with Swagger-documented REST contracts.

React TypeScript NestJS PostgreSQL MongoDB Redis OAUTH2 RBAC Jest Swagger

Junior Full Stack Developer

Octo Mais

Oct 2015 - Mar 2018 (2 years 5 months)

Developed internal compliance and reporting tooling using React frontends and Node.js backends focused on data integrity, RBAC, and automated reconciliation. Implemented Redis caching and async background jobs to remove manual spreadsheet steps, and added Mocha/Chai integration tests with Swagger-documented REST endpoints.