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Renzo Llagas

@renzollagas

Message

Senior Backend Engineer specializing in scalable, resilient microservices and cloud-native architectures.

United States

Message

What I'm looking for

I seek backend or cloud roles where I can design scalable microservices, lead migrations to cloud/serverless, mentor engineers, and improve observability and security in Agile teams.

I am a Senior Backend Engineer with 6+ years of experience designing and delivering scalable, resilient backend systems using Java (Spring Boot/WebFlux), Node.js, and Python. I build high-performance infrastructures and APIs for 50K+ daily users, lead migrations to serverless and container platforms, and drive engineering best practices to improve reliability and test coverage.

I mentor junior engineers, champion DevOps practices, and create AI-enhanced solutions such as RAG-based document intelligence and no-code AI form automation that reduced manual effort by up to 60%. I thrive in Agile/Scrum teams and focus on observability, security, and measurable performance improvements.

Experience

Work history, roles, and key accomplishments

Current

Senior Backend Engineer

Current

Wandari

Feb 2023 - Present (3 years 4 months)

Built and deployed scalable microservices and real-time systems (filtering, RAG document intelligence, WebRTC conferencing) using Spring Boot and Node.js, improving semantic retrieval accuracy to 90%+ and supporting concurrent real-time sessions while reducing manual form creation time by 60%.

Java Spring Boot Node WebRTC AWS ECS API Gateway Docker REST APIs

Senior Backend Engineer

BCP

Feb 2021 - Dec 2022 (1 year 10 months)

Modernized core banking APIs for 50K+ daily users with Spring Boot, achieving 95% test coverage, reducing production errors by 20% and migrating services to AWS Lambda to improve response times by 25%.

Spring Boot Java AWS Lambda API Gateway MongoDB Junit Mockito DevOps CI CD

Backend Engineer

Telefonica

Jul 2020 - Feb 2021 (7 months)

Developed Spring Boot/WebFlux microservices to migrate 50K+ daily records and improved legacy APIs, auto-correcting 95% of data issues and boosting API performance by 30% while reducing production errors by 25%.

Spring Boot Webflux Azure Blob Storage Java Jenkins Git

Backend Engineer

Canvia

Sep 2019 - Jul 2020 (10 months)

Replaced legacy JSF systems with Spring Boot APIs for client onboarding, reducing maintenance effort by ~34% and eliminating known security vulnerabilities through library upgrades.

Spring Boot Java REST APIs SQL API Design

Backend Engineer

Peru Fashions

Oct 2018 - Aug 2019 (10 months)

Migrated legacy PowerBuilder system to microservices and REST APIs using Spring Boot, improving security by 40%, reducing load times by 25%, and completing 45% of the transition within 6 months.

Spring Boot JPA Spring Security Microservices REST APIs Java

Education

Degrees, certifications, and relevant coursework

Scrum.org

Professional Scrum Master (PSM I), Agile / Scrum

2020 - 2020

Obtained the Professional Scrum Master I (PSM I) certification demonstrating knowledge of Agile and Scrum practices.

Universidad César Vallejo

Bachelor's Degree, Systems Engineering

2013 - 2018

Completed a Bachelor’s Degree in Systems Engineering covering software development, databases, and systems integration from January 2013 to December 2018.