Senior Quantitative Software Engineer with C#/.NET Expertise

Leonel Alejandro Salazar Ramirez

Senior Software Engineer

Sinaloa 21, El Rastro, 46400 Tequila, Jal., Mexico +52-374-***-**** *****************@**********.** https://www.linkedin.com/in/leonel-alejandro-salazar-ramirez/ https://github.com/leonel-ramirez12

Summary

Senior Software Engineer with strong expertise in designing and scaling distributed systems across .NET and Java ecosystems, leveraging ASP.NET Core, Spring Boot, and cloud-native architectures. Proven experience delivering high-performance APIs, event-driven platforms, and resilient microservices using technologies like Apache Kafka, Kubernetes, and Terraform, with a deep focus on scalability, reliability, and system design. Skilled in driving end-to-end development, optimizing performance, and establishing architectural standards that enhance maintainability and operational efficiency.

Technical Skills

·Languages:

Java, Kotlin, SQL, JavaScript, TypeScript, HTML, CSS, Bash, Groovy, XML, YAML

·Languages:

C#, SQL, JavaScript, TypeScript, HTML, CSS, PowerShell, Bash, JSON, XML, YAML

·Frameworks & Libraries:

ASP.NET Core (Web API, MVC, Minimal APIs), .NET (Core/6/7/8+), SignalR, gRPC, GraphQL (.NET), MediatR, AutoMapper, FluentValidation, Polly, Serilog, NLog, IdentityServer / Duende IdentityServer, Hangfire, MassTransit, Refit

·• Data Access & ORM:

Entity Framework Core, Dapper, ADO.NET, LINQ (advanced), Query optimization, Transactions, Caching strategies

·Databases & Storage:

Microsoft SQL Server, PostgreSQL, MySQL, MongoDB, Redis, Cosmos DB, Elasticsearch

·Messaging & Event Streaming:

RabbitMQ, Apache Kafka, Azure Service Bus, Azure Event Grid, Azure Event Hubs, Background Services, WebSockets

·Cloud & DevOps:

Microsoft Azure (App Services, Functions, AKS, Service Bus, Storage, Key Vault), AWS (basic/optional), Docker, Kubernetes, Helm, Terraform / Bicep, GitHub Actions, Azure DevOps, Jenkins, CI/CD pipelines, Nginx, IIS

·Testing & Quality:

xUnit, NUnit, MSTest, Moq, FluentAssertions, Testcontainers (.NET), Integration Testing, TDD, BenchmarkDotNet, Coverlet

·Security:

Authentication & Authorization, JWT, OAuth2, OpenID Connect, ASP.NET Identity, RBAC, API Security, TLS/SSL, Data Protection API, OWASP Top 10

·Monitoring & Observability:

Application Insights, OpenTelemetry, Prometheus, Grafana, ELK Stack, Seq, Datadog, Azure Monitor, Distributed Tracing

·Tools & Platforms:

Visual Studio, VS Code, Rider, Git, GitHub, GitLab, Bitbucket, Swagger / OpenAPI, Postman, Fiddler, Jira, Confluence, Docker Desktop, NuGet

·Architecture & Concepts:

Microservices Architecture, Monolith to Microservices Migration, Distributed Systems, Domain-Driven Design (DDD), Clean Architecture, Hexagonal Architecture, Event-Driven Architecture, CQRS, Saga Pattern, API Gateway, RESTful API Design, gRPC, Concurrency & Multithreading, Async Programming, Caching, Fault Tolerance, High Availability, Scalability, System Design, Design Patterns, SOLID Principle

Experience

Senior Software Engineer

Mar 2024 – Present

Freelancer

Hybrid

·Architect distributed platforms using domain-driven boundaries alongside Clean Architecture, enabling independent scalability and long-term maintainability.

·Design and deliver APIs using ASP.NET Core, Spring Boot, REST, GraphQL, and gRPC, applying contract-first principles across services.

·Establish lifecycle governance covering API versioning, schema evolution, and backward compatibility across multiple client integrations.

·Build streaming pipelines powered by Apache Kafka and Azure Service Bus, optimizing throughput and latency for real-time workloads.

·Apply resilience patterns with Polly, improving fault isolation and system stability under high concurrency.

·Develop persistence layers using Entity Framework Core, Dapper, and JPA, incorporating query tuning and caching strategies.

·Design secure identity and access flows utilizing OAuth2, JWT, and ASP.NET Identity across distributed environments.

·Deploy cloud-native solutions on Microsoft Azure and AWS, leveraging Docker, Kubernetes, and infrastructure-as-code techniques.

·Introducing observability practices using OpenTelemetry, Prometheus, Grafana, and centralized logging for production diagnostics.

·Optimize execution performance through asynchronous programming, multithreading, and efficient resource utilization.

·Orchestrate background workloads via Hangfire and messaging-based execution pipelines.

·Enable real-time communication using SignalR and WebSockets for interactive system components.

·Enhance delivery workflows through GitHub Actions, Azure DevOps, and automated CI/CD pipelines.

·Lead architectural evaluations, guiding decisions aligned with scalability, reliability, and maintainability objectives.

Senior Software Engineer

Feb 2021 – Mar 2024

Santoli Connected Network

Remote

·Transformed a legacy platform into domain-oriented distributed services, improving modularity and deployment independence.

·Designed hybrid communication layers combining synchronous APIs with asynchronous messaging for diverse workloads.

·Built event streaming solutions using Apache Kafka and RabbitMQ, enabling decoupled service interaction.

·Applied CQRS and Saga patterns to coordinate long-running workflows and maintain consistency across systems.

·Delivered backend components using Spring Boot and .NET, aligning implementations with shared architectural standards.

·Optimized storage strategies across PostgreSQL, MongoDB, Redis, and Elasticsearch, improving performance under high load.

·Containerized workloads with Docker and managed orchestration using Kubernetes.

·Automated infrastructure provisioning using Terraform and cloud-native tooling.

·Established telemetry pipelines using OpenTelemetry and ELK Stack, improving system-wide visibility.

·Strengthened release reliability through validation stages and rollback mechanisms in CI/CD workflows.

·Mentored engineers in distributed system design and scalability practices.

·Defined service ownership boundaries, improving maintainability and accountability across teams.

·Improved resource efficiency and workload distribution, reducing bottlenecks and operational costs.

Software Engineer

Dec 2018 – Jan 2021

HUBBERS

Remote

·Delivered backend capabilities supporting core business workflows and product features across the platform.

·Structured modular components using Spring Boot, improving separation of concerns and code organization.

·Enhanced database efficiency through indexing strategies and query tuning in MySQL and PostgreSQL.

·Enforced secure access controls using JWT and Spring Security, protecting sensitive operations and data.

·Introduced distributed caching using Redis, reducing latency and improving response times.

·Built validation layers using FluentValidation, ensuring consistency and reducing runtime errors.

·Refactored legacy code to improve maintainability, readability, and extensibility.

·Expanded automated testing coverage using JUnit and Mockito, increasing confidence in releases.

·Resolved production incidents through root cause analysis, improving system reliability and uptime.

·Collaborated with stakeholders to deliver scalable feature implementations aligned with business needs.

·Reduced technical debt through incremental refactoring and structural improvements.

Software Engineer

Nov 2017 – Nov 2018

MassMutual

Hybrid

·Developed frontend components using JavaScript, HTML, and CSS, integrating backend services for consistent data interaction.

·Contributed to backend systems using Java and .NET, supporting business logic and request handling.

·Authored optimized SQL queries supporting transactional operations and reporting requirements.

·Improved API integration stability, ensuring reliable communication between frontend and backend systems.

·Participated in collaborative workflows using Git, including code reviews and branching strategies.

·Supported bug resolution and incremental feature delivery across the application.

·Improved application structure and maintainability through targeted refactoring efforts.

Education

Ateneo de Manila University Oct 2013 - Aug 2017

Bachelor of Computer Science

Certifications

AWS Certified Solutions Architect – Associate Aug 2022 – Aug 2025

https://www.credly.com/badges/2b0a067a-90a4-42b0-aac0-83458c6cd164

Contact this candidate