Alejandro Ueno

As a full-stack developer, I design and build scalable web and mobile applications while leading the evolution of modern frontend architectures and performance optimization initiatives. My work focuses on improving application maintainability, modernizing legacy systems, and delivering responsive user experiences using JavaScript and TypeScript.

In this role, I collaborate closely with product and engineering teams to translate business requirements into technical solutions, ensuring that frontend systems, backend infrastructure, and APIs are designed with a strong focus on performance, reliability, and long-term maintainability.

Key projects:

► Full restructuring of a legacy application through API migration, code cleanup, and process standardization

► Migration of backend infrastructure to GraphQL and frontend refactoring

Key outcomes:

► Improved frontend performance through targeted refactoring and architectural changes

► Increased code maintainability and double-digit improvements in load times

► Built and developed a high-performing team of 3 developers

► Significant reduction in technical debt and improved development capacity through AI-powered tools

🛠️ Tech Stack:

React – Next.js – React Native – TypeScript – JavaScript – React Query – Redux – React Context – Node.js – GraphQL – REST APIs – NestJS – SQL – PostgreSQL – CockroachDB – Redis – RabbitMQ – OpenSearch (Elasticsearch) – Amazon S3 – Amazon SQS – OAuth – JWT – Git – GitHub Actions – Webpack – CI/CD Pipelines – Docker

Recognized as a Top-Rated Freelancer with a 100% success rate across 20+ projects.

Project Portfolio:

♦ GCP logging to track logs from scrapers

♦ Benchmarking, visualization and performance measurement of marketing campaigns

♦ Transformation and modification of data using Retool

Technical: AWS Lambda – dynamodb – AWS Buckets – Google Buckets – Google VM – Google Colab – Widgets

Testimonials:

"Alejandro has been spectacular to work with. He took everything I was looking for and made it happen. He suggested ways to accomplish what I sought out to do that I didn't know or think about. I look forward to working with him again soon. Thank you!"

"One of the best upwork interactions I've ever had. I needed a scraping script improved (faster, less buggy, etc) and Alejandro returned exactly what I wanted, and quickly. Stellar work, A+ hire."

"Alejandro did an excellent job delivering a completed project exactly as I needed, and was very helpful in walking me through the process. I very much appreciated his open communication style and timely status updates. Thanks for your great work!"

At Weekly Ventures SL, I was primarily focused on data analytics and web scraping to deliver actionable insights for management teams and champion impactful strategic and tactical changes. Some of the projects that I have worked on include:

♦ Development of integrated dashboards and other performance measurement tools

♦ Build-out of ETL processes and optimization of data flow pipelines

♦ Web scraping and organization of data from online platforms

♦ Reporting tools to track and benchmark site metrics (traffic, conversion, bounce rates)

♦ Creation of channel measurement tools and user-level reporting

♦ Construction of data management infrastructure and visualizations for senior management teams