Seygi K.

Seygi K.

Sao Paulo, Brazil

Back End Developer

14 years of exp.


Profile Summary

Experienced Senior Software Engineer with a proven track record of designing, architecting, and delivering high-availability distributed systems. Skilled in developing large-scale web applications, microservices, and APIs for the financial, fraud, and security sectors. Proficient in .NET Core (C#), Java, and Node.js, with expertise in Clean Architecture, SOLID principles, and Design Patterns.

Primary Skills

C# | 14 yrs

Culture Profile

In workplace, I am known for . . .
  • In the workplace, I am known for my problem-solving skills, collaboration, and delivering high-quality solutions.
  • In the workplace, I am known for my adaptability, attention to detail, and ability to meet tight deadlines.
I thrive in environments . . .
  • I thrive in environments that encourage innovation, collaboration, and continuous learning and growth.
  • I thrive in environments that foster creativity, support teamwork, and prioritize open communication.
I struggle in environments . . .
  • I struggle in environments that lack clear communication, direction, or opportunities for collaboration.
  • I struggle in environments that are highly bureaucratic or resistant to change and new ideas.

Work Experience

ShoppingGives

Senior Software Engineer
  • Jun, 2023 - Present
  • Remote
  • Migrating architecture from .NET to NodeJs with TypeScript, reducing the cost on AWS Cloud by about 30% monthly.
  • Reducing the time to process donations and increasing the simultaneous processing by about 20%.
  • Supporting big companies such as Michael Kors, Coach, etc.

Skills

C#TypeScriptAPI GatewayAWS LambdaPostgreSQL.NET CoreRabbitMQ

Industries

Software

XP Investimentos

Partner | Fraud Prevention Engineering Manager
  • Sep, 2020 - Jan, 2023
  • Remote
  • Reduced fraud costs by approximately 15% through the development of highly scalable and secure APIs
  • Managed and mentored a team of software engineers, successfully promoting several individuals to Lead Software Engineer
  • Led the development of highly scalable, resilient, and secure APIs for Fraud Prevention, ensuring robust protection for the company and its +7MM customers
  • Recognized for exceptional leadership and team-building efforts, resulting in the expansion of a small squad of 4 developers into a thriving tribe with over 40 dedicated to security services
  • Spearheaded the XP rules engine project from conception to implementation, significantly improving data collection and decision-making processes
  • Successfully implemented Facial Biometrics (Facetec) for enhanced security measures
  • Orchestrated the implementation of cutting-edge technologies and best practices, establishing a foundation for high-performance and innovative solutions

Skills

C#API GatewayAzure BlobsAzure DatabricksAzure Event HubsData Lake AnalyticsPower BIRedis.NET CoreApache Kafka Azure Service Bus

Industries

Financial ServicesSoftware

XP Investimentos

Lead Software Engineer
  • Mar, 2020 - Sep, 2020
  • Remote
  • Successfully implemented Facial Biometrics (Facetec) for enhanced security measures.
  • Created and led 2 squads focused on improving security journeys.
  • Implemented a Dinamo HSM appliance for secure Token (2FA) authentication, reducing costs by 10% and improving response times for our mobile app and website.
  • Successfully implemented Auth0 and Electronic Signature for enhanced security measures.
  • Stabilized critical and security journeys, allowing for medium and long-term focus.

Skills

C#API GatewayAzure BlobsAzure DatabricksAzure Event HubsData Lake AnalyticsPower BIRedis.NET CoreApache Kafka Azure Service Bus

Industries

Financial Services

XP Investimentos

Senior Software Engineer
  • Aug, 2019 - Feb, 2020
  • Brazil
  • Optimized login journey, reducing response time from 3 seconds to 250ms.
  • Architected and implemented a facial recognition system authorizing +100K daily transactions.
  • Developed highly scalable, resilient, and secure APIs for Fraud Prevention, AML, Authentication, and Authorization.
  • Ensured code quality and stability through comprehensive testing, including unit, integration, and load testing.

Skills

C#API GatewayAzure BlobsAzure DatabricksAzure Event HubsData Lake AnalyticsPower BIMicrosoft SQL ServerOracleRedis.NET CoreApache Kafka Azure Service Bus

Industries

Financial ServicesSoftware

Iteris Consultoria e Software

Lead Software Engineer
  • Mar, 2013 - Aug, 2019
  • Remote
  • Led development teams in the financial sector, working with clients such as Itaú, Rede, Banco Votorantim, Raizen, and Pagseguro.
  • Created scalable and elastic applications for cloud environments (AWS, Azure).
  • Led the integration of the Rede team with Visa for REST services of Chargeback, improving payment processes.
  • Focused not only on project completion but also on enchanting clients to initiate new projects with the company, resulting in a significant growth of client projects by 30%.

Skills

C#JavaAWSAzureAPI GatewayMicrosoft SQL ServerRedis.NET CoreAngularNode.jsApache KafkaSharepoint

Industries

Financial Services

Micropost

Senior Software Engineer
  • Mar, 2011 - Feb, 2013
  • Remote
  • Led development teams and contributed to the development of web systems, SOAP services, and REST APIs.
  • Integrated with SOAP systems and developed portals for the financial sector, condominiums, and post offices.
  • Undertook the migration of a project from COBOL to .NET, ensuring a smooth transition and enhanced functionality.
  • Modeled databases, ensured UX/UI quality, and delivered high-quality programming solutions.

Skills

JavaScriptMySQL.NETjQuery

Industries

Financial ServicesSoftware

Eggtech Sistemas & Serviços

Software Engineer
  • Apr, 2010 - Feb, 2011
  • Remote
  • Developed .NET applications
  • Improved and maintained ERP systems
  • Created ERP solutions

Skills

JavaScriptMySQL.NETjQuery

Industries

IT ServicesSoftware

Education

Bachelor's degree
  • Computer Science, Information Technology
  • Centro Universitário FMU | FIAM-FAAM, Brazil
  • 2012

All Skills

  • Languages

    • C# | 14 yrs
    • JavaScript | 7 yrs
    • TypeScript | 7 yrs
    • Java | 7 yrs
  • Cloud

    • AWS | 6 yrs
    • Azure | 6 yrs
    • API Gateway | 9 yrs
    • AWS Lambda | 7 yrs
    • Azure Blobs | 6 yrs
    • Azure Databricks | 3 yrs
    • Azure Event Hubs | 6 yrs
    • Data Lake Analytics | 4 yrs
    • Power BI | 2 yrs
    • Azure Service Bus | 5 yrs
  • Databases

    • Microsoft SQL Server | 14 yrs
    • MySQL | 5 yrs
    • Oracle | 5 yrs
    • PostgreSQL | 7 yrs
    • Redis | 7 yrs
  • Frameworks

    • .NET | 14 yrs
    • .NET Core | 13 yrs
    • Angular | 3 yrs
    • Node.js | 5 yrs
  • Libraries

    • Apache Kafka | 7 yrs
    • jQuery | 1 yr
    • RabbitMQ | 5 yrs
    • Nest.js | 7 yrs
  • Tools

    • CI/CD Pipelines | 7 yrs
  • Platforms

    • Sharepoint | 5 yrs
  • Paradigms

    • Distributed Systems | 14 yrs