Daniel Santana
Verified Expert in Engineering
DevOps and Developer
São Paulo - State of São Paulo, Brazil
Toptal member since November 26, 2015
Daniel is a full-stack software engineer with expertise in JavaScript/TypeScript/React, Python, Linux, and cloud environments, among other technologies. He has extensive experience designing real-time, mission-critical systems where reliability and performance were essential. Daniel focuses on practical, standards-based solutions that facilitate teamwork and enable the quick delivery of business needs.
Portfolio
Experience
- Linux - 12 years
- Python - 10 years
- Node.js - 10 years
- TypeScript - 8 years
- Docker - 8 years
- PostgreSQL - 7 years
- React - 7 years
- Kubernetes - 6 years
Preferred Environment
Docker, Kubernetes, Linux, PostgreSQL, Python, TypeScript, SQLite, React
The most amazing...
...project I've built is my own Linux distribution, having a small footprint and being runnable on servers, embedded devices, desktops and Android smartphones.
Work Experience
Full-stack Software Engineer
Alaska Airlines / Up Labs LLC
- Designed data pipelines for processing and normalizing spreadsheet data into Google BigQuery using Python with the Pandas library.
- Implemented ELT processes using Databricks for dashboard data ingestion.
- Defined a software stack and system architecture for the application development.
- Developed RESTful APIs with FastAPI and responsive web interfaces with Next.js.
- Implemented UI/UX designs from Figma with interactive components and dynamic data visualizations.
Full-stack Software Engineer | DevOps Engineer
Konektera
- Developed a custom CRM platform to manage deals between partners and clients, unify company data from different platforms, and concentrate main business activities into a single place with an optimized workflow.
- Managed a team of four members alongside me to keep up the development and maintenance of the CRM platform.
- Implemented AI pipelines with RAG to generate copywriting templates based on information available from the clients and our partners.
- Unified the infrastructure from different service providers into AWS and handled systems administration and maintenance.
- Took part in discussing, planning, and implementing operational improvements to reduce company costs and increase staff performance.
Full-stack Software Engineer | DevOps Engineer
Pfizer, Inc
- Developed a platform used by C-level executives to track global development, production, and distribution of COVID-19 vaccines with up-to-date information daily.
- Improved COVID-19 platform resilience to avoid downtime during infrastructure maintenance or unplanned service downtimes.
- Developed an ETL setup to fetch and merge data continuously from internal APIs, relational, columnar, and graph databases with PostgreSQL, Redshift, Neo4j, and other manual data sources, e.g., SharePoint spreadsheets.
- Led a team of developers to create MARS, a Pfizer Management of Analytics and Reporting Solutions. This platform aggregates and displays data insights about clinical trials running globally from multiple systems.
- Integrated public data from ArcGIS using weather forecasts and natural disaster information to predict and warn about possible disruptions in vaccine/drug distribution across the globe.
- Developed custom search pages for the company's internal search engine to show information about employees, customers, materials, and other content associated with their business.
- Created and configured scalable CI/CD workflows in Azure DevOps, GitHub Actions, and Jenkins.
Full-stack Software Engineer
ASAPP, Inc.
- Added and improved many features to the internal data annotation platform (back and front ends), such as user/role management, data import/export, new annotation mechanisms, legacy data migration, bulk data manipulation, and analytical dashboards.
- Developed tools for dynamically annotating and tagging large data sets by multiple users in complex workflows used to train AI chatbot models.
- Added a test framework to the front-end platform to reduce regressions in future changes.
- Refactored the front end into a single standardized codebase and cleaned extraneous code and dependencies.
- Improved the UI/UX by applying material design best practices, simplifying user interactions, and closely listening to user feedback.
- Improved the Docker setup to reduce image sizes, improve build time, and adequately use production builds.
Full-stack Software Engineer
For Days, Inc
- Improved the analytics platform by creating new dashboards, fixing existing ones with more accurate data, and using custom parameters to view historical data more flexibly.
- Enhanced the performance of complex SQL queries in the analytics platform and documented them to reduce the learning curve so that other team members could modify them in future changes.
- Implemented user voucher creation/modification in the back-office platform.
Full-stack Software Engineer
Caos Group
- Wrote a bulk email pinging/verification platform from scratch.
- Developed a call center platform from scratch with an integrated autodialer system using a predictive dialing algorithm tailored for the specific usage of the company.
- Created G.AI.A, a marketing platform that uses AI and NLP to create campaigns with better results.
- Architected a system for automatically processing user data and discount coupons according to the user profile.
- Configured a Kubernetes cluster for Scuta.ai, a call center platform that uses AI and NLP to match call recordings against the scripts.
Software Engineer | Technology Consultant
TveStore
- Ported the legacy platform to Docker to simplify the software development and deployment procedures.
- Configured a distributed storage setup for uploading and downloading videos.
- Implemented metrics and logging on the whole platform using a New Relic and ELK stack to help track down recurrent bugs and issues.
- Mentored the development team and the board of directors on best practices for software development and workflow improvements.
- Planned a major redesign of the platform without impacting the delivery of new features demanded by clients.
Full-stack Software Engineer
Easytown
- Led and reviewed the work of a team of three developers during the whole development of the platform.
- Developed the architecture of a social eCommerce platform considering high scalability and modularity requirements.
- Attended public events (e.g., campus party) to present the project to a variety of people with very different backgrounds.
- Redesigned the system during a major shift in the company strategy.
- Led the development of the redesigned platform progressively without any downtime.
Full-stack Software Engineer
Project One
- Developed the architecture of proprietary CRM systems in the company.
- Designed and implemented a system of dynamically generated lead capture forms with real-time statistics dashboards.
- Developed an ORM in .NET inspired by Entity Framework to integrate the company's proprietary frameworks.
- Integrated and normalized information from multiple APIs of different data providers.
- Developed a highly interactive data analysis dashboard using Crossfilter and D3.js.
- Configured production environments and deployment procedures.
- Created a simple deployment system using bash scripts.
- Architected extensions and customizations for vTiger, a CRM system.
- Made custom portlets for the Liferay platform using JRuby.
- Managed a team of four developers and coordinated the work with a designer for the initial prototypes of a startup project.
Software Developer
Freelance
- Developed a pet shop ERP (desktop and web application) with real-time synchronization and analytical data visualizations.
- Worked closely with local pet shops to understand their workflows and use cases and developed tools to fit into their daily tasks without increasing work complexity.
- Developed an access control system for a medical government entity.
Experience
Easytown
Technologies used include Node.js, MongoDB, RabbitMQ, ElasticSearch, Redis, Python, and AngularJS.
Education
Professional Degree in Cybersecurity
FIAP - São Paulo, SP
Bachelor's Degree in Biomedical Science
São Camilo University - São Paulo, SP
Bachelor's Degree in Computer Science
Carlos Drummond de Andrade University - São Paulo, SP
Associate's Degree in Software Development
State Technical School - São Paulo, SP
Associate's Degree in Electricity/Electronics
SENAI Roberto Simonsen - São Paulo, SP
Skills
Libraries/APIs
Immutable.js, React, Node.js, jQuery, REST APIs, Chart.js, Recharts, SQLAlchemy, Bottle.py, Pandas, D3.js, TanStack Table, OpenAPI, Pydantic, Vue, SharePoint API, ArcGIS, WebRTC
Tools
Git, Vim Text Editor, Terraform, Pytest, Microsoft Visual Studio, Google Kubernetes Engine (GKE), Dialogflow, Blender, Claude, RabbitMQ, Redash, Asterisk, AutoCAD, FluidSIM, Jenkins, Jira, Adobe Experience Design (XD), Azure Kubernetes Service (AKS), Asana, Amazon Simple Email Service (SES), Prisma, Retool, BigQuery
Languages
HTML, CSS, TypeScript, GraphQL, Python, C#, JavaScript, SQL, C, VB.NET, JRuby, Clojure, Kotlin, PHP, Java
Frameworks
Express.js, Django, Django REST Framework, AngularJS, Redux, Next.js, Jest, Flask, React Native, Angular, .NET, Laravel, Alembic, Spring Boot, Spring, Material UI
Platforms
Linux, Kubernetes, Docker, Amazon Web Services (AWS), Google Cloud Platform (GCP), Heroku, New Relic, Android, Azure, Rancher, Databricks
Storage
Redis, MongoDB, PostgreSQL, NoSQL, SQLite, Oracle RDBMS, Microsoft SQL Server, Neo4j, Hasura, Redshift, Amazon S3 (AWS S3), PostGIS
Paradigms
Scrum, Azure DevOps, Agile, DevSecOps, Defensive Programming
Industry Expertise
Cybersecurity
Other
Amazon RDS, Shell Scripting, Data Visualization, Chakra UI, NeoVim Text Editor, NixOS, Artificial Intelligence (AI), 3D Printing, OpenSCAD, FastAPI, Zustand, Agentic AI, Large Language Models (LLMs), Microsoft Azure, Electricity, Electronics, Industrial Automation, Home Automation, Biology, Molecular Biology, Computational Biology, Drug Development, Genetics, Biotechnology, Research Methods, Clinical Trials, Full-stack, Data Engineering, PostGraphile, Waterfall Methodology, Statistics, Physics, Optics, IT Project Management, IT Security, IT Governance, Data Governance, SecOps, Offensive Security, Red Teaming, Software Development, GPU Computing, CTO, OpenAI, Azure Databricks, Google BigQuery, LangChain, Retrieval-augmented Generation (RAG), Pgvector
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