MENDES DOS SANTOS Alexandre

Aug 2025 - Present

Healthcare and social care technology platform serving European markets

• Architected and implemented scalable microservices architecture for healthcare applications using Kotlin and Spring Boot, serving social care and health sectors across European markets with strict regulatory compliance requirements
• Engineered cloud-native solutions for demanding healthcare environments, designing robust systems that handle sensitive patient data and critical care workflows while maintaining GDPR compliance and data privacy standards
• Managed containerized infrastructure at scale using Kubernetes (EKS) orchestration, implementing auto-scaling, service mesh architecture, and zero-downtime deployments for mission-critical healthcare services
• Implemented comprehensive Infrastructure as Code (IaC) strategies using AWS CDK and Terraform, automating cloud resource provisioning and ensuring consistent, reproducible environments across development, staging, and production
• Optimized relational database performance through query optimization, indexing strategies, and connection pooling for PostgreSQL/MySQL databases, reducing response times and improving system throughput for high-volume healthcare data operations
• Developed RESTful APIs and event-driven microservices handling complex healthcare workflows, integrating with public health data sources while maintaining strict GDPR compliance and implementing comprehensive audit logging
• Designed and implemented data processing pipelines for public healthcare datasets, ensuring regulatory compliance with GDPR requirements, data anonymization techniques, and secure data governance practices
• Collaborated with cross-functional Agile/Scrum teams in fully remote environment, participating in architecture decision records (ADRs), conducting code reviews, and mentoring junior developers on Kotlin best practices and cloud-native patterns

Tech Stack: Kotlin, Spring Boot, Kubernetes (EKS), AWS (CDK, Lambda, S3, RDS), PostgreSQL, MySQL, Terraform, Docker, Gradle, RESTful APIs, Event-Driven Architecture, GDPR Compliance, Microservices, CI/CD

Jan 2024 - Aug 2024

National railway ticketing platform serving 15M+ monthly active users

• Architected and implemented serverless microservices architecture for real-time train booking and seat reservation systems using AWS Lambda, API Gateway, and DynamoDB
• Led migration of legacy monolithic services to event-driven architecture using AWS EventBridge and SQS, reducing latency and improving system resilience
• Designed and developed RESTful APIs for multi-modal transportation integration (train, bus, car-sharing), implementing circuit breakers and retry patterns for high availability
• Implemented Infrastructure as Code (IaC) using AWS CDK and CloudFormation, built automated CI/CD pipelines reducing deployment time from hours to minutes
• Optimized NoSQL database (DynamoDB) data models and query patterns, achieving sub-100ms response times for complex journey searches across millions of route combinations
• Built real-time pricing engine with dynamic fare calculation using AWS Step Functions for complex workflow orchestration
• Established comprehensive monitoring and alerting using CloudWatch and X-Ray, improving incident detection and resolution time
• Collaborated with cross-functional Agile/Scrum teams in fully remote environment, participating in architecture reviews and mentoring junior developers

Tech Stack: Node.js, TypeScript, AWS Lambda, DynamoDB, API Gateway, EventBridge, Step Functions, CDK, CloudFormation, CI/CD, Microservices

AI-powered recruitment platform serving HR professionals and recruiters

• Built and launched MatchATS, a production SaaS platform that helps HR teams screen candidates in seconds using AI-powered resume matching
• Architected full-stack application using Next.js, TypeScript, and Tailwind CSS for responsive, modern user interface
• Implemented advanced AI features including compatibility scoring, interview question generation, and skill gap analysis
• Integrated Clerk authentication system for secure user management and seamless onboarding experience
• Deployed and scaled on Vercel platform with optimized performance and global CDN distribution
• Designed user-centric features like hard skill compatibility analysis and industry profile matching
• Built comprehensive candidate screening workflows that transform hours of manual review into automated insights

Tech Stack: Next.js, TypeScript, Tailwind CSS, Clerk Auth, Vercel, AI/ML APIs

Product: match-ats.com

Mar 2023 - Nov 2023

Digital transformation for major Swiss banking institutions

• Developed high-performance Java microservices for real-time payment processing and transaction validation using Spring Boot framework
• Implemented distributed transaction patterns using Saga orchestration pattern for complex multi-service operations ensuring ACID compliance across microservices architecture
• Built secure API Gateway layer with Spring Cloud Gateway, implementing rate limiting, request validation, and OAuth2/JWT authentication for PSD2 compliance
• Designed and implemented event sourcing architecture using Apache Kafka for audit logging and transaction history in event-driven system
• Optimized SQL database queries and implemented caching strategies with Redis, reducing average RESTful API response time significantly
• Developed automated reconciliation service for cross-border payments using Spring Batch framework, processing millions of records in nightly batches
• Implemented comprehensive unit testing and integration testing using JUnit 5, Mockito, and TestContainers following TDD practices
• Participated in Agile/Scrum ceremonies and on-call rotation, resolving production incidents and performing root cause analysis

Tech Stack: Java 17, Spring Boot, Spring Cloud, Apache Kafka, PostgreSQL, Redis, Hibernate/JPA, Docker, Kubernetes, GitLab CI/CD, Maven, Microservices

May 2021 - Jan 2023

Wealth Management platform modernization

• Led backend Java development for COBOL-to-Java migration project, re-architecting legacy monolithic systems into modern microservices architecture serving wealth management advisors
• Designed and developed RESTful APIs for portfolio management, risk assessment, and regulatory reporting modules using Spring Boot framework and Hibernate/JPA for ORM
• Implemented complex business logic for investment portfolio rebalancing and tax optimization algorithms using Java 8/11 features
• Built integration layer for real-time market data feeds processing thousands of price updates daily
• Developed Angular-based admin dashboard for system monitoring and configuration management with TypeScript
• Established automated CI/CD pipelines using Jenkins, Maven, and SonarQube, improving code quality metrics and deployment frequency
• Mentored junior developers and led technical workshops on microservices best practices in Agile environment

Tech Stack: Java 8/11, Spring Boot, Hibernate/JPA, Angular, TypeScript, Oracle DB, Maven, COBOL integration, Docker, Jenkins, CI/CD, Microservices

Dec 2020 - May 2021

Enterprise HR Management Platform

• Architected authentication and authorization system using Spring Security framework and Keycloak, supporting SSO (Single Sign-On) for 5000+ enterprise users
• Designed and developed RESTful APIs for employee skill mapping, search, and classification using Elasticsearch for full-text search capabilities
• Implemented LDAP/Active Directory integration for seamless user provisioning and role-based access control (RBAC)
• Built data models and database schema using Hibernate/JPA for complex hierarchical organization structures
• Developed Spring Batch processing jobs for daily synchronization with external HR systems

Tech Stack: Java 8, Spring Boot, Spring Security, Hibernate/JPA, Keycloak, PostgreSQL, Elasticsearch, LDAP, RESTful APIs

Feb 2020 - Dec 2020

Social Networking Mobile Application

• Led complete backend migration from JHipster monolithic application to Quarkus microservices architecture, improving startup time by 10x and reducing memory footprint significantly
• Implemented real-time messaging features using WebSockets protocol and server-sent events (SSE)
• Designed and developed location-based matching algorithm for social event recommendations
• Built push notification service integrating with Firebase Cloud Messaging (FCM) API
• Containerized Java applications using Docker and implemented local development environment with docker-compose for improved developer experience

Tech Stack: Java, Quarkus, Hibernate/JPA, Keycloak, PostgreSQL, Docker, Firebase, WebSockets, RESTful APIs, Microservices

Oct 2018 - Dec 2019

Telecom Services Platform for Orange

• Developed RESTful APIs using Java and Spring Boot framework for TV service provisioning and content delivery management
• Implemented distributed caching layer using Hazelcast in-memory data grid, improving API response times by 40%
• Built JMX (Java Management Extensions) based monitoring dashboards for cache performance and system health metrics
• Wrote comprehensive technical specifications and API documentation, implemented unit testing with JUnit and Mockito

Tech Stack: Java 8, Spring Boot, Hibernate/JPA, Hazelcast, JMX, Docker, JUnit, Mockito, RESTful APIs, Maven

Product: match-ats.com

• Full-stack SaaS platform that revolutionizes HR candidate screening with AI-powered matching
• Features include compatibility scoring, interview question generation, and skill gap analysis
• Built with modern tech stack: Next.js, TypeScript, Tailwind CSS, Clerk Auth, deployed on Vercel
• Solves the time-consuming problem of manual resume screening for HR professionals

• Built TypeScript ETL pipeline processing 500K+ accident records
• Developed interactive data visualization dashboard with Chart.js

• Developing multiplayer game backend using C# and GDScript
• Implementing real-time synchronization and state management

• Building high-performance REST APIs with Go and Gin framework