Luiz de Castro

Luiz de Castro

Solutions Engineer | Integration & Architecture

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Berlin, Germany+4915140372255toluizcastro@gmail.com

Senior Solutions Engineer with 10+ years of experience designing and delivering technical implementations across SaaS, payment infrastructure, open finance, and fraud prevention. Skilled at partnering with engineering, product, and customer teams to architect scalable integrations and turn complex requirements into practical solutions that drive real business outcomes.

Experience

Solutions Engineer·Payrails

12.2024 – 03.2026

Act as technical advisor throughout the full customer adoption journey, from solution design through deployment and ongoing health management. Lead pre-sales workshops with architecture recommendations tailored to each customer's environment. Onboard merchants by managing integrations with third-party platforms and APIs, diagnosing technical issues across authorization flows, webhooks, and tokenization setups. Guide customers through complex platform migrations. Partner with Product and Engineering to translate recurring integration patterns into platform improvements.

Solutions Engineer·Signifyd

07.2022 – 11.2024

Served as primary technical advisor for enterprise e-commerce merchants adopting a machine learning-based SaaS platform. Designed customised pre-sales demos and proof-of-concepts to demonstrate business impact. Managed data ingestion pipelines using Python and SQL. Worked closely with customers on webhook-based event flows and real-time API integrations. Collaborated with Data Science, Product, and Engineering to refine solutions based on recurring customer feedback.

Senior Solutions Engineer·Belvo

02.2022 – 07.2022

Advised enterprise clients on integrating developer-focused open finance APIs, translating technical concepts for both engineering and business stakeholders. Developed customised demos and proof-of-concepts using JavaScript, Python, and React. Served as a key escalation point for product feedback, collaborating with product managers on feature scoping and roadmap planning.

Implementation Engineer·Infobip

03.2016 – 02.2022

Integrated third-party services and APIs into Infobip's platform for enterprise clients, delivering scalable cloud solutions on AWS and Azure. Designed and built custom orchestration workflows managing routing logic and service coordination across multiple channels and providers. Collaborated with Go-To-Market, Product, and Engineering to drive platform improvements, including early integration of LLM-based features into conversational AI products.

Portfolio

Sanity CV Profile

Featured
Production

A content-managed CV and portfolio site built with Sanity and Next.js. Work experience, skills, projects, and education are all modeled as structured documents in Sanity Studio and served via GROQ queries. New projects can be published directly from the Studio without touching code, with instant ISR revalidation keeping the frontend in sync. Built as a hands-on dive into Sanity's content platform, covering schema design, Portable Text, and the full image pipeline and live content delivery.

Next.jsTypeScriptSanity StudioTailwind CSSGROQ
Studio ↗Web ↗

Eleplate

Production

Full-stack application helping Los Angeles restaurants reduce taxes by donating surplus food to organisations feeding people in need. Built with React, Next.js, Node.js, and MongoDB, integrating Stripe, DoorDash, Uber, AWS, and email service APIs to automate the donation and tax benefit workflow.

Node.jsReact.jsNext.jsMongoDB
Backend (Private) ↗Frontend (Private) ↗

Tradingrid

MVP

Web application enabling cryptocurrency investors to automate custom trading strategies without writing code. Built with React, Node.js/Express, Python/Flask, and MongoDB, integrating with Binance and Bybit APIs and Stripe and PayPal SDKs for payment processing.

Node.jsReact.jsPythonMongoDB
Backend ↗Frontend ↗Service ↗

Neovia

MVP

Web application helping a local infrastructure company streamline budget calculations by automating material pricing and cost estimates. Built with React, Node.js, and MongoDB, featuring a custom database integration and automated budget generator.

SQLNode.jsMongoDBReact.js
Backend ↗Frontend ↗

Skills

Tech Stack

Node.jsPythonReact.jsNext.jsPostgreSQLMongoDBCloud (AWS, GCP)

Domain

SaaS IntegrationsHeadless ArchitecturePaymentE-commerce Platforms

Methods

REST APIsSDKsWebhooksSolution DesignTechnical Documentation

Observability

DatadogGrafana

AI & ML

LLM APIsPrompt EngineeringML-based Systems

Education

Information Technology

Instituto Federal do Paraná (IFPR)

Degree

Computer Science for Web Development

Harvard University through edX

Online Course

Languages

EnglishFluent
PortugueseNative
SpanishIntermediate
GermanBasic

Managed with Sanity · Built with Next.js