Lucas Sena

Although my title was Tech Lead, over 50% of my time was hands-on as a developer, actively coding, designing solutions, and maintaining systems. To provide support to the client’s team, who had been managing the project prior to our involvement. Considering the team already had 1 tech leader and 2 architects actively coding.

• CI/CD - azure devops - scrum
• Visa/Mastercard integrations
• Unit test, native AOT, sonarqube, data encryption, Auth0.

Keywords: Figma, Azure, APIM, .Net 8, .Net Core, Minimal API, Sql, Kibana, Rancher, BFF.

Developing cutting-edge solutions in direct contact with clients or a team.

• CI/CD - Azure DevOps - Scrum
• SOLID, Clean Code, Clean Architecture, Design Patterns, DDD, and CQRS
  
• Unit and Integration Testing

Keywords/Skills: Figma, Azure, APIM, .NET 8, .NET Core, Minimal API, SQL, NoSQL, Azure Functions, Cosmos DB, Storage Account, Key Vault, Notification Hub.

Technical leadership and innovation, with architectural designs, applied solutions in a team responsible for executing court orders, and monetary and asset blocking.

• Business keywords: BacenJud, ISO 27001, Documentation, Legal Update Maintenance, National Monetary Council (CMN) Resolution, Audit Logs, Banking Secrecy Law (Complementary Law No. 105/2001), LGPD, Code of Civil Procedure (Law No. 13.105/2015).
• I established rules to avoid building solutions in the legacy system, migrated some services to a serverless architecture using AWS Lambda, and implemented logging and health check concepts with CloudFront.
• I developed APIs in microservices and established communication between these services via messaging, improving scalability and system maintenance. CI/CD improvement.
• Enhancement of the agile culture, promoting better understanding and application of Scrum.
• I established the use of Definition of Ready (DoR) and Definition of Done (DoD) criteria, improved process documentation, and extracted more value from meetings, making them more productive and focused.

Keywords/Skills: C#, .NET6, DDD, CQRS, Lambda, Azure DevOps, Scrum, AWS MSK, SQS, S3, SNS, CloudWatch, EKS, SonarQube, Auth0, Design Patterns, AWS CloudFormation, ElasticCache, SQL Server, MySQL, Event Handling, Mediatr.

Client: Grupo ViaVarejo
I implemented Pix (new payment system), supported, and planned solutions such as ZeroDollar, along with credit and debit card validation.

• I had the opportunity to work with a highly organized and collaborative team at a great company, gaining valuable experience.
• We started with Kanban and gradually transitioned to Scrum, guided by a Project Manager (PM), Product Owner (PO), Technical Leader, and Agile Leader, throughout this process, I used management tools like Jira, Confluence, and Microsoft Teams to optimize our workflows.
• As a member of the Payment Gateway team, our primary focus was:
  -Developing microservices using .NET 5, optimized for deployment in Kubernetes.
  -My role involved hands-on experience with CI/CD pipelines using Jenkins, integrations with GitHub, SQL Server, MongoDB, and Kafka.
• With a focus on testing quality, we opted for Test-Driven Development (TDD) and also used circuit breaker patterns, resilience strategies, encryption, Cypress, as well as unit and integration tests.
• Additionally, I explored and applied technologies and tools such as Kong, Hangfire, Polly, GraphQL, CQRS, event sourcing, RSA encryption, and monitoring solutions like Kibana and Grafana, we also used Sonar for code quality and security analysis.
• Our DevOps, Database, and Infrastructure teams provided specialized support, ensuring that each area was managed by experts.

Keywords/Skills: C#, .NET5, TDD, Scrum, CQRS, Auth0, DoD, DoR, Kanban, MongoDB, Kafka, Elastic Cache, JMeter, Cypress, CI/CD, Azure DevOps, TDD, EKS, Jenkins, SQL Server, MySQL

I worked directly with clients by proposing cloud solutions focusing on Azure and updated technology stacks.

Keywords/Skills: c#, azure functions, xamarin, mvvm, windows forms, cosmo db, storage tables, ACR, DDD, Sql, No Sql, Invoice Printer.

• Focused on enhancing the architectural foundation of the company’s main product (with over 1,400 screens) by establishing a Visual Studio template to standardize development across all teams.
• Developed new solutions, introducing modern technologies to the company.

Keywords/Skills: MVVM, C#, Azure Functions, HTTP Trigger, Web API, Swagger, SQL Database, Push Notifications, Windows Forms, MVVM, Agile, FCM-Firebase, VB6.

Responsible for the IT team and cost reports for infrastructure and partnerships.

• Communication and negotiation of solutions with the Android and iOS Tech Leads.
• Gathered and refined requirements with clients.
• Designed the architecture of systems and cloud solutions.
• Assisted in team building and technical discussions.
• Developed complex app functionalities related to likes, comments, playlists, following artists, large-scale push notifications, big data on music audience, subscriptions, and premium services within the app.
• Stack: C#, .NET Web API, Azure, AWS, ElasticCache, ElasticSearch, SQL Server.

Keywords/Skills: OAuth 2, Cognito, JWT, SOLID, Clean Code, Blue-Green deployment, Agile.

To support the growth of a music streaming app, several steps were necessary:

• Migration of the system to the cloud.
• Creation and maintenance of solutions on AWS/Azure.
• Optimization of the software architecture.
• Research and apply new solutions.
• Stack: C#, Git, .NET WebAPI, Azure, AWS, Zabbix.

Keywords/Skills: Azure SQL Database, VPN, AWS ELB, S3, CloudFront, Cognito, Route 53, stress testing, warming up patterns, latency evaluation, health checks.

I was hired urgently after a referral to solve a critical issue in a production system with an API serving 300,000 users.

• My responsibility was to investigate and resolve the issue, ensuring the stability and continuity of services without interruption.
• Based on my experience, I implemented improvements in the API's architecture and infrastructure, optimizing performance and strengthening system resilience in a short timeframe.
• Stack: C#, JavaScript (JS), jQuery, MVC.NET, WebAPI, MSSQL, ASP.NET WebForms, Windows Server 2008, Windows Server 2012, IIS, TFS.

Keywords/Skills: MSSQL Replication, Stored Procedures, Views, IIS farm load balancing, repository pattern, caching patterns.

Development of internal systems aligned with the CEO.

• Focus on a dynamic web communication system with adaptive language support.
• Stack: C#, Javascript (JS), jQuery, ASP.NET WebForms, SQL Server.

Keywords/Skills: EntityFramework, MVC, Three-tier architecture, IIS, Windows Server.

Document digitization, user support.