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Kelwin GamezKG

Kelwin Gamez

Senior Java Backend Engineer | Java | Spring Boot

€350/day
Santander, ES
8-15 years

Average response time: 1 hour

About Kelwin

Senior Java Backend Engineer with 12+ years of experience designing and building distributed systems, cloud-native applications, enterprise data platforms, and large-scale backend solutions using Java, Kotlin, Spring Boot, and Microservices.

Throughout my career, I have worked across Banking, Travel Tech, Business Information, Marketing, and Wholesale Distribution, contributing to the design, modernization, and evolution of enterprise systems used by thousands of customers.

My experience spans the full software development lifecycle, from requirements refinement and solution design to implementation, deployment, production support, and continuous improvement. I have participated in the delivery of cloud-native platforms on Azure and Google Cloud Platform, leveraging technologies such as Kafka, RabbitMQ, BigQuery, Kubernetes, and Reactive Programming.

In addition to my engineering roles, I have contributed to consulting initiatives involving platform modernization, database migrations (SQL Server to PostgreSQL), Google Ads API integrations, cloud-native data discovery platforms, and distributed microservice architectures. These engagements required technical investigation, solution design, system integration, and backend development across complex enterprise environments.

In recent years, I have focused on backend platforms operating at scale, collaborating closely with architects, business stakeholders, and cross-functional teams to translate business requirements into maintainable and scalable technical solutions. My work includes digital banking products, enterprise data platforms, reporting systems, high-volume transactional services, and large-scale distributed systems integrating multiple data sources and cloud technologies.

Core expertise:
• Java (11–21), Kotlin
• Spring Boot, REST APIs
• Microservices & Distributed Systems
• Kafka, RabbitMQ
• PostgreSQL, SQL Server, BigQuery
• Azure, GCP
• Kubernetes
• Platform Modernization & System Integration
  • English

    Fluent

  • Spanish

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • Huxley
    Senior Software Engineer
    BANKING AND INSURANCE
    May 2023 - Today (3 years and 2 months)
    Santander, Spain
    Client: ING Bank Spain & Portugal
    Project: Youth Banking Account Platform

    • Contributed to the design, implementation, and delivery of a new banking account product for minors, participating from the early stages of the initiative through the launch of the first production MVP.
    • Collaborated with business stakeholders, architects, and engineering teams to translate business requirements into scalable technical solutions.
    • Participated in architecture and design discussions, evaluating technical approaches and ensuring alignment between business objectives, security requirements, and implementation strategies.
    • Supported the evolution of the product from a savings-focused offering into a transactional banking experience, enabling capabilities such as debit cards and Bizum integration.
    • Contributed to a banking platform that has grown to more than 30,000 active accounts in production.
    • Investigated and resolved production issues, providing troubleshooting support and contributing to platform stability and operational excellence.
    • Serve as one of the primary technical references within the project, maintaining domain knowledge and supporting continuity across multiple team transitions.
    Java Kotlin SQL AzureDevOps SpringBoot
  • eDreams ODIGEO
    Senior Software Engineer
    TRAVEL AND TOURISM
    May 2022 - May 2023 (1 year)
    Barcelona, Spain
    Project: Accommodation Area

    • Developed backend services supporting accommodation-related business processes within a large-scale travel platform.
    • Collaborated with internal stakeholders to gather requirements and deliver new features for the Accommodation domain.
    • Led the onboarding of 12 ETL microservices supporting invoice reconciliation processes and operational data flows.
    • Participated in production support rotations, troubleshooting incidents, analyzing application behavior, and contributing to service reliability using observability and monitoring tools.
    • Contributed to a distributed microservices ecosystem handling high-volume operational workflows and integrations.
    Git SQL Spring boot Google cloud Java
  • EPAM Systems
    Senior Software Engineer
    January 2020 - February 2022 (2 years and 1 month)
    Kraków, Poland
    Project: Reporting Platform (Equifax)

    • Acted as a technical lead during the initial project phase, collaborating with business analysts and stakeholders to refine requirements and define implementation approaches.
    • Designed and implemented microservices for a reporting platform processing large-scale datasets and supporting real-time tracking and reporting workflows.
    • Applied Domain-Driven Design (DDD) principles to model business domains and align technical solutions with business requirements.
    • Participated in solution modeling activities, defining service boundaries, API contracts, and integration patterns within a distributed architecture.
    • Contributed to cloud-native deployments and platform implementation on Google Cloud Platform (GCP), leveraging services such as BigQuery, Pub/Sub, Firestore, IAM, and KMS.
    Google cloud Git Spring boot Java Microservices

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Education

  • Google Cloud Platform Fundamentals: Core Infrastructure M101 P: MongoDB for Developers Aspect Oriented Programming (AOP) using Spring AOP and AspectJ Oracle Certified Associate, Java SE 8 Programmer
    Google Cloud Platform Fundamentals: Core Infrastructure M101 P: MongoDB for Developers Aspect Oriented Programming (AOP) using Spring AOP and AspectJ Oracle Certified Associate, Java SE 8 Programmer
  • Licenciado en Computación, Ciencias de la Computación
    Universidad de Carabobo
    2014
    Licenciado en Computación, Ciencias de la Computación

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