Senior Full Stack Developer with Java/Rust expertise

Leonel Alejandro Salazar Ramirez

Full Stack Developer

Sinaloa 21, El Rastro, 46400 Tequila, Jal., Mexico +523********* *****************@*************.*** linkedin.com/in/leonel- alejandro-salazar-ramirez github.com/leonel-ramirez12 PROFESSIONAL SUMMARY

Full Stack Developer with 8+ years of professional practice building large-scale backend software systems using Java and Rust with deep experience across the complete software development lifecycle including design, implementation, testing, and rollout in enterprise environments. Brings proven expertise in instrumenting services, developing metrics, and driving durability and performance improvements for systems operating on thousands of servers with high throughput requirements. Incorporates AI-assisted development tools including Gemini, Cursor, and Claude Code into daily workflows while exhibiting curiosity and seeking to understand before offering solutions. Communicates proactively in remote environments by keeping teams informed, surfacing blockers early, and applying analytical thinking to ambiguous problems with a focus on coding methodologies and best practices.

TECHNICAL SKILLS

• Languages: Java, Rust, Python, C++, C#, JavaScript, TypeScript, SQL, HTML5, CSS3, Bash, Shell Scripting Frameworks & Libraries: Spring Boot, Actix, Tokio, Django, Flask, FastAPI, React, Next.js, Node.js, Express.js, NumPy, Pandas, Scikit-learn, Jest, PyTest

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Frontend Technologies: React, Next.js, Redux Toolkit, HTML5, CSS3, Tailwind CSS, Material UI, Bootstrap, Vue, Styled Components, Vite

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UI/UX & Performance: Responsive Design, Cross-Browser Compatibility, Lighthouse Optimization, Lazy Loading, Code Splitting, Server-Side Rendering, Progressive Web Apps, Accessibility Standards, Core Web Vitals, Dashboard and Metrics Visualization

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APIs & Web Services: RESTful APIs, GraphQL, gRPC, OAuth 2.0, JWT Authentication, Swagger/OpenAPI, Postman, API Versioning, Webhooks, Service Integration Patterns

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Databases: PostgreSQL, MySQL, MongoDB, Redis, DynamoDB, Elasticsearch, SQLite, Query Optimization, Schema Design, Data Durability Patterns

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Cloud & DevOps: Amazon Web Services, Google Cloud Platform, S3, EC2, Lambda, CI/CD Pipelines, GitHub Actions, Docker, Kubernetes, Terraform, Cloud Monitoring, Metrics Collection

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PROFESSIONAL EXPERIENCE

Version Control: Git, GitHub, GitLab, Bitbucket, GitFlow, Pull Request Reviews, Code Reviews, Branching Strategies, Tagging and Releases, Commit Standards

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Testing: Unit Testing, Integration Testing, End-to-End Testing, JUnit, PyTest, Jest, Cargo Test, Regression Testing, Performance Testing, Durability Testing

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Security: OWASP Standards, OAuth 2.0, JWT, Role-Based Access Control, Data Encryption, Secure API Design, Input Validation, Data Protection, Audit Logging, Authentication and Authorization

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Containerization: Docker, Docker Compose, Kubernetes, Helm, Amazon ECS, Amazon EKS, Microservices Architecture, Container Orchestration, Image Optimization, Development Containers

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Messaging & Integration: Apache Kafka, RabbitMQ, Amazon SQS, Amazon SNS, Event-Driven Architecture, Real-Time Data Streaming, Pub/Sub Patterns, Asynchronous Processing, Message Queuing, Throughput Optimization

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IDE & Tools: VS Code, IntelliJ IDEA, Cursor, Gemini, Claude Code, Rust Analyzer, Cargo, Postman, Swagger Hub, Docker Desktop, DataGrip, Terminal and CLI

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Others: Large-Scale Systems, Linux Internals, File Systems, AI-Assisted Development, Technical Design Documents, Coding Best Practices, Analytical Thinking, Remote Communication, Agile Methodologies, Curiosity- Driven Engineering

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Full Stack Developer Mar 2024 – Present

Freelancer Remote

Full Stack Engineer Feb 2021 – Mar 2024

Santoli Connected Network Remote

Participating in technical design discussions and contributing to clear design documents that define architecture for large-scale backend systems supporting object storage and data durability requirements

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Contributing to the maintenance of existing applications while participating in the implementation of new features that improve system throughput and reliability across thousands of servers

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Instrumenting services and developing metrics to drive durability and performance improvements through systematic monitoring and data-driven optimization of storage platform components

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Helping shape coding methodologies and best practices by establishing standards for code reviews, testing strategies, and documentation that elevate engineering quality across distributed teams

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Building predictive models and interactive dashboards that visualize operational metrics and system performance in real time enabling proactive identification of bottlenecks and anomalies

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Incorporating AI-assisted development tools including Gemini, Cursor, and Claude Code into daily engineering workflows to accelerate solution design and code implementation

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Exhibiting curiosity and seeking to understand before offering solutions by thoroughly investigating system behavior and root causes before proposing architectural changes

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Communicating proactively in a remote environment by keeping the team informed, surfacing blockers early, and moving work forward through clear written and verbal updates

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Applying analytical thinking to ambiguous problems by breaking down complex storage and performance challenges into actionable investigation paths and well-reasoned solutions

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Built software that managed the complete operational and legal workflow from accepted offer through closing by developing document generation capabilities for purchase agreements, disclosures, lease contracts, and closing packages

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Created transaction workspaces using React and TypeScript where agents, coordinators, buyers, sellers, and attorneys could securely access and collaborate on deal-critical documents throughout the entire transaction lifecycle

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Integrated electronic signature workflows with platforms such as DocuSign through RESTful API and webhook integrations enabling legally binding digital execution across multiple parties and regulatory jurisdictions

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Implemented approval tracking dashboards to monitor which parties had reviewed and signed required documents providing complete visibility into transaction progress and outstanding action items

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Built notification engines and automated reminder systems for pending signatures, contingencies, and closing deadlines using background processing to ensure critical milestones were never missed during time-sensitive transactions

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Designed comprehensive audit trails capturing every document creation event, access attempt, content modification, and signature action for full regulatory compliance and traceability across all system interactions

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Implemented secure document storage architectures with PostgreSQL and granular role-based access permissions ensuring only authorized parties could view or modify sensitive legal and financial documentation

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Worked closely with legal and compliance teams to ensure all document management workflows adhered to regulatory and brokerage requirements across multiple jurisdictions while maintaining clean and well-tested code

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Full Stack Developer Dec 2018 – Jan 2021

Hubbers Remote

Web Developer Nov 2017 – Nov 2018

MassMutual Hybrid

EDUCATION

Bachelor of Computer Science

Ateneo de Manila University

2013 – 2017

Developed a financial security platform called FraudShield designed to detect, prevent, and report fraudulent activity in real-time transactions for banks, payment processors, and fintech applications

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Built transaction monitoring capabilities that continuously tracked all incoming and outgoing transactions while flagging unusual patterns such as unexpected high amounts, unusual locations, and repeated failed attempts

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Engineered high-performance backend services with Java and Python that processed real-time transactions through streaming pipelines using Apache Kafka and RabbitMQ for smooth and reliable data ingestion

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Implemented caching strategies with Redis to quickly access recent transaction data and detect anomalies without repeatedly querying primary PostgreSQL database clusters during peak processing windows

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Integrated machine learning models built with Python for anomaly detection that automatically evaluated transaction risk scores and flagged high-risk activities before financial damage could occur

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Created interactive React and Vue dashboards that displayed real-time alerts, flagged transactions, and investigative reports enabling fraud analysts to respond within critical time thresholds

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Designed database architectures across PostgreSQL, MongoDB, and Redis for transaction history, user logs, and high- speed caching with encryption and role-based access controls

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Contributed to backend service development using Java and C# for insurance product processing systems that required high accuracy and data integrity across policy administration workflows

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Assisted in building RESTful API endpoints that connected frontend consumer portals with backend policy administration and underwriting databases for seamless and secure data exchange

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Developed frontend components with React and JavaScript that improved user workflows for policy quoting and application submission processes across multiple insurance product lines

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Wrote unit and integration tests using JUnit and Jest to ensure code reliability and reduce production defect rates throughout quarterly release cycles and sprint deliveries

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Participated in code review processes and agile ceremonies while learning distributed systems patterns and cloud deployment practices from senior engineering mentors

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Supported database migration efforts from legacy systems to PostgreSQL while maintaining data consistency and application uptime throughout carefully planned transition periods

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