MediaMarkt Saturn GmbH
Linkedin Profile
Senior Software Engineer
As part of the Subscription Management team, I collaborated closely with a multi-talented team to
maintain and enhance the APIs that power the subscription workflow. This involved regular meetings
to discuss solutions, share ideas, and ensure alignment on project goals. Together, we worked to
support MediaMarkt’s growth into new countries, products, and partnerships.
My focus was on implementing new features, improving scalability, and making the APIs more dynamic
and adaptable.
Key contributions include:
- Application Maintenance: Assisted in maintaining and improving a suite of
several interconnected
services on Google Cloud, ensuring reliable functionality and performance.
- Dynamic Contract Generation: Designed and implemented the Document API to
dynamically
generate subscription contracts, integrating data and templates to produce PDFs.
- Innovative Onboarding Solutions: Developed the subscription-bootstrap project,
leveraging Docker and Docker Compose to simplify the setup process for new developers, enabling
rapid project initiation and reducing onboarding time.
- Data Migration: Worked on migrating customer data to the company’s
a global Customer Data Repository.
- Batch Processing Solutions: Developed a reliable SFTP consumer for batch job
processing of sales document cancellations using Spring Integration, ensuring efficient data
handling and integration with storage solutions.
- Infrastructure Migration: Supported the migration of services to a new GCP
project aligned with MediaMarkt’s infrastructure shift to Kubernetes, Terraform, GitHub Actions,
and FluxCD.
- Monitoring and Observability: Established a comprehensive monitoring stack
utilizing Prometheus, Grafana, Loki, and Promtail, significantly improving system observability
and addressing technical debt.
- Proactive Error Management: Implemented the "Sheriff" methodology to enhance
error monitoring and documentation, improving the team's focus on critical issues and
prioritization.
- Continuous Improvement: Actively engaged in fixing bugs, enhancing platform
performance, and optimizing the development process within the team.
Technologies used: Java, Springboot, Python, Google Cloud, Docker, Kubernetes,
Terraform, Python, SQL,
Spring Integration, Prometheus, Grafana, CI/CD tools, Agile methodology.
Rakuten GmbH
Linkedin Profile
Senior Software Engineer
I contributed to both the Product and Customer teams, optimizing and migrating
core services. My journey with the company began when I was referred by my former manager at
Americanas.com to support the modernization of their systems.
Initially, I joined the Feed Management team, where I participated in strategy meetings to define
the technologies and approaches needed to transform their monolithic architecture into a scalable,
microservices-based solution. Later, I transitioned to the Customer team, where I led efforts to not
only migrate legacy systems to a microservices architecture but also adopt modern technologies like
Golang, Kubernetes, Terraform, and CI/CD pipelines.
These projects were deployed on the Azure cloud platform, focusing on delivering robust, scalable,
and efficient solutions that aligned with the company's growth and modernization goals. My work
involved close collaboration with cross-functional teams, ensuring successful implementation and
knowledge sharing across the organization.
Key contributions include:
-
Service Maintenance and Optimization:
Initially part of the Product team, I was responsible for maintaining a large Java monolith that
managed catalog feed updates. However, the application faced several bottlenecks, leading to
frequent failures and inconsistencies in product information. After identifying the primary
bottleneck, I designed and implemented a decoupled microservice using an event-driven
architecture and the pipeline pattern to optimize image processing tasks.
This microservice not only offloaded the image processing workload from the legacy application,
significantly boosting performance and stability, but also paved the way for further
improvements and modernization by addressing the core bottleneck.
-
Microservices Migration: During a major
restructuring, I led a team of three developers in
migrating all services to a microservices architecture
on a Kubernetes infrastructure, rewriting every service
in Go. This transformation enhanced system performance
and scalability.
-
Database Migration: Successfully migrated the database from PostgreSQL to
MongoDB to meet the platform's evolving needs for greater scalability and improved handling of
higher data volumes. This migration ensured data integrity while optimizing performance within
the new microservices architecture. By adopting MongoDB, we were able to enhance the system's
ability to scale efficiently, support more dynamic data models, and manage growing workloads
seamlessly.
-
Agile Methodology Enhancement: Guided
the team towards a more effective Scrum approach,
implementing pair programming to foster collaboration
and accelerate learning.
Technologies used: Java, Go, Kubernetes,
Azure, PostgreSQL, MongoDB, Redis, RabbitMQ, CI/CD tools, Agile methodology.
Americanas.com
Linkedin Profile
Senior Software Engineer
As part of the checkout team at the largest e-commerce platform in Latin America, I was responsible
for designing, developing, and maintaining high-availability microservices that facilitated seamless
online shopping experiences across the continent.
I worked on maintaining and developing resilient, scalable software and architectures that processed
vast amounts of real-time data with excellence. This ensured not only the ability to handle the high
demand from our users but also to manage peak situations during major events like Black Friday in a
seamless and transparent manner.
Throughout this challenge, I leveraged various technologies and architectures, with Java (always
up-to-date) and Spring Boot as the primary stack for most of the APIs, while taking full advantage
of AWS cloud resources.
Key contributions include:
- Microservices Development: Developed and maintained core microservices for
cart, checkout, and order processing using Java, ensuring high availability and reliability in a
large-scale e-commerce environment.
- AME Integration: Implemented AME, a new proprietary payment solution from
Americanas Group, which provides an asynchronous payment process through a QR code in an
e-Wallet app, offering cashback benefits both within the platform and off-platform.
- Pick Up In Store & Pick Up Now: Contributed to the “Pick Up In Store” and “Pick
Up Now” features, allowing users to pick up their products either from a physical store or
directly from store inventory, improving the flexibility of the customer experience.
- Payment Pre-Approval: Led the development of the credit card pre-approval
system, providing real-time feedback during checkout and improving the user experience by
eliminating payment uncertainty. This initiative required cross-team collaboration and was
gradually rolled out through A/B testing, ensuring minimal user disruption.
- Real-Time Data Processing: Designed and developed the wishlist feature,
enabling users to receive push notifications and emails for product deals. Leveraged AWS Kinesis
for real-time processing of product feeds and integrated with customer APIs to deliver
personalized alerts efficiently.
- Cloud Platform Management: Managed and configured a wide range of AWS services,
ensuring the platform’s scalability and performance. Contributed to the optimization of CI/CD
pipelines, enabling fast and reliable deployment processes.
- Collaborative Work: Worked closely with cross-functional teams, including
product and payments teams, ensuring smooth collaboration on initiatives such as the "Black Box"
credit card pre-approval system and other customer-facing features.
Technologies used: Java, Python, Clojure,
Node.js, Amazon AWS, New Relic, GitLab, Bitbucket, CI/CD
tools, Agile Scrum methodology.
T.O. Brasil
Linkedin Profile
Senior Software Engineer
As a Back-End Developer at TO-Brasil, I worked on Java Web Services for CAIXA, a government bank. My
main responsibilities included maintaining their existing applications and developing new ones based
on strict specifications and requirements. We used the JSF framework and Spring MVC for these
projects.
I was brought in to introduce TDD practices to the team. This involved organizing
learning sessions, mentoring team members, and helping implement TDD in both new and existing
applications. I also worked directly with the customer to understand their needs, keep them updated
on progress, and make sure our solutions aligned with their expectations. My job was to help the
team improve their development process while making sure we met the client’s demands.
Key contributions include:
- Application Development: Developed Java Web Services using the JSF Framework
and Spring MVC,
focusing on delivering high-performance applications that met client
specifications.
- TDD Training: Led training sessions to introduce TDD practices to the team,
filling a key knowledge gap and ensuring that the team could apply TDD effectively in their
work, especially for CAIXA Banco do Brasil.
- Test Automation: Implemented test automation using a Java-based Selenium
solution, which improved the efficiency and reliability of our testing processes, ensuring more
consistent and accurate results.
- Client Communication: Worked closely with CAIXA to understand their needs,
discuss enhancements, and update them on project progress. This helped maintain a strong,
collaborative relationship and ensured the development was aligned with their expectations.
Technologies used: Java, JSF, Spring
MVC, Selenium, TDD methodologies.
Marlin
Linkedin Profile
FullStack Engineer
As a FullStack Developer, I was responsible for maintaining and developing robust
web software solutions, collaborating closely with both our development team and the company's
customers to deliver applications that best meet their needs. My role involved working
across the entire stack to ensure high-quality solutions that addressed both business requirements
and technical challenges.
Key contributions include:
- Full-Stack Development: Developed applications primarily using MVC.NET
framework & Drupal for dynamic content management and delivering the best user experiences.
- Database Management: Designed and managed SQL databases to ensure data
integrity and efficient retrieval processes.
- Collaboration & Leadership: Worked closely with my team to understand customer
needs and make sure we delivered the right solutions. I was involved in meetings with customers
to ensure we were on the same page, and I helped design and architect the software while keeping
the team aligned and motivated to get the job done. My focus was always on clear communication,
ensuring everyone was involved and we stayed focused on delivering quality work.
- Challenges: Successfully managed a large portfolio of applications for a
variety of clients, from small e-commerce platforms to large internal systems for big companies,
all with a small team of 3-6 developers. This involved keeping systems running smoothly while
developing new solutions across different technologies and business cases. One of the big wins
was identifying and fixing a critical bug in a legacy payment module by decompiling a DLL to C
and rewriting the logic in Java, improving data accuracy for customer transactions. I also
handled meetings, mentored the team, and led software design and development to make sure our
solutions were reliable and scalable.
Technologies used: Drupal (PHP, JavaScript, HTML, CSS), SQL, C#, .NET, Java, Spring
MVC, Git, SVN, C.
