Open to opportunities

Daniel Santos

@danielsantos

Message

I am a senior backend engineer specializing in scalable cloud microservices.

Brazil

Message

What I'm looking for

I seek a senior backend/cloud role focused on scalable microservices, observability, cost optimization, and opportunities to lead technical initiatives and mentor engineers in an Agile environment.

I am a senior software engineer focused on building resilient, cost-efficient backend systems for fintech and banking.

At my current role I implemented structured observability that cut feature errors by 50% and led the end-to-end design and delivery of a Savings feature using scalable Go microservices; I also migrated card and account integrations to reduce monthly costs by 17.5% and drove reliability improvements that increased NPS by 20%.

Previously at XP Inc I built an event-driven .NET Core application that generated and stored over 1MM credit card invoices monthly, reduced storage costs by 70.6% using Azure Blob, cut PDF delivery time by 75% with Kafka-driven architecture, and lowered contact rate to save about $100k monthly while managing and mentoring a team of seven engineers.

I bring strong expertise in cloud (AWS, Azure), containers and orchestration (Docker, Kubernetes), databases (MongoDB, PostgreSQL, SQL Server, DynamoDB), observability and monitoring, and automated testing; I enjoy leading technical initiatives, optimizing costs, improving reliability, and mentoring engineers to deliver impactful fintech products.

Experience

Work history, roles, and key accomplishments

Current

Senior Software Engineer

Current

Modak App

Aug 2024 - Present (1 year)

Implemented structured observability with AWS CloudWatch and centralized logging, reducing Allowances feature errors by 50%; led design and delivery of Go microservices for a Savings feature and migrated card integrations to a new banking partner, cutting monthly costs by 17.5% and improving NPS by 20%.

Go AWS Cloudwatch Microservices API Integration Observability Webhooks Docker

Senior Software Engineer

XP Inc

Jan 2022 - Aug 2024 (2 years 7 months)

Built an event-driven .NET Core system generating and storing +1MM credit card invoices monthly and moved PDF storage to Azure Blob to cut costs by 70.6%; implemented Kafka-based workflows that reduced PDF delivery time by 75% and decreased contact rate by 6.5%, saving $100k monthly while leading a team of 7 engineers.

C#.NET Core Kafka Azure Blob Storage MongoDB Event Driven Architecture Handlebars Gotenberg

Software Engineer

Modal Bank

Feb 2021 - Jan 2022 (11 months)

Developed 30+ RESTful APIs for the Open Banking initiative and optimized SQL Server schema and queries to handle 100k+ daily transactions, ensuring regulatory compliance and scalable transaction processing.

C#Entity Framework REST APIs SQL Server Performance Tuning Dapper