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Fernando – AWS, Node.js, Typescript, experts in Lemon.io

Fernando

From El Salvador (UTC-6)

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Front-end Web DeveloperMiddle
Back-end Web DeveloperSenior
14 years of commercial experience
Administration
AI
Banking
Consumer services
Dating
Entertainment
Fintech
Management
Media
Recreation
Social media
Travel
Subscription
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Fernando – AWS, Node.js, Typescript

Fernando is a Senior Software Engineer with over 10 years of experience in front and backend development, specializing in Ruby and Ruby on Rails. He also has knowledge of Node.js, TypeScript, and React, alongside a solid understanding of design and architectural patterns. Experienced in cloud environments and legacy system refactoring, Fernando adapts quickly, recently migrating a recommendation algorithm to Golang within two weeks while ensuring output consistency through thorough testing. He has led teams of up to 30 people but values staying hands-on with technology.

Main technologies
AWS
7 years
Node.js
8 years
Typescript
5 years
Ruby
12 years
MongoDB
7 years
Ruby on Rails
10 years
React
3 years
Additional skills
PostgreSQL
REST API
Redis
Golang
ElasticSearch
Docker
GitHub Actions
OpenAI API
gRPC
Claude LLM
Nest.js
Jest
API Gateway
AWS Lambda
DynamoDB
Amazon S3
Terraform
Salesforce
Heroku
Direct hire
Potentially possible
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Experience Highlights

Senior Software Engineer
Dec 2023 - Ongoing1 year 5 months
Project Overview

It's a curated discovery feature within the product's ecosystem that helps members find restaurants, bars, hotels, galleries, and cultural spaces based on shared values, social context, and personalized recommendations.

Responsibilities:
  • Designed and maintained Node.js microservices for recommendations, search, and data ingestion.
  • Built and optimized REST and gRPC APIs that support filtering, ranking, and discovery.
  • Integrated external data sources like Google Maps, Targetron, and Apify to enrich place data.
  • Drove 80 %+ test coverage through unit, integration, and end-to-end testing strategies.
  • Managed CI/CD pipelines with GitHub Actions, including disposable environments and automated validations.
  • Collaborated with product and data teams to align technical solutions with business goals and user experience.
  • Played a key role in making the app a more responsive and intelligent discovery feature within the company's ecosystem.
Project Tech stack:
Typescript
Nest.js
OpenAI API
Claude LLM
ElasticSearch
Redis
PostgreSQL
Node.js
AWS
GitHub Actions
Senior Software Engineer
Sep 2022 - Nov 20231 year 2 months
Project Overview

It's a membership-based dating app that has evolved into an iOS-exclusive platform for professional networking and social discovery, serving a global community of creatives, influencers, and professionals seeking meaningful connections.

Responsibilities:
  • Designed and built scalable and reliable backend services using Go, Node.js, and TypeScript.
  • Worked on extracting and reengineering the recommendation algorithm from a monolithic architecture into a high-performance Golang microservice.
  • Set up and manage CI/CD pipelines using GitHub Actions.
  • Monitored and addressed alerts and deployment reliability issues proactively.
  • Configured linters, spec runners, and disposable environments for automated E2E testing.
  • Ensured 80 %+ test coverage across codebases.
  • Worked closely with engineers and cross-functional stakeholders to align technical execution with business goals.
Project Tech stack:
Golang
Node.js
Ruby on Rails
gRPC
REST API
PostgreSQL
ElasticSearch
AWS
Redis
Docker
GitHub Actions
OpenAI API
Senior Software Engineer
Dec 2022 - Nov 202310 months
Project Overview

It's a global education organization that specializes in equipping individuals with practical skills in technology, data, design, and business.

Responsibilities:
  • Maintained and enhanced internal Ruby microservices and React.js web applications.
  • Conducted code reviews to ensure code quality and adherence to best practices.
  • Provided ongoing support for legacy systems and implemented new features to meet business needs.
  • Led efforts in technical documentation to improve process clarity and team communication.
  • Worked on Salesforce integrations for seamless data flow between platforms.
  • Improved reliability and performance of key internal services by modernizing legacy systems.
Project Tech stack:
Ruby on Rails
Node.js
REST API
gRPC
PostgreSQL
React
Salesforce
Docker
Heroku
Senior Software Engineer
Dec 2019 - Aug 20222 years 7 months
Project Overview

It's an online financial institution that provides education-focused financial solutions to help students and families achieve their academic and financial goals.

Responsibilities:
  • Developed and maintained RESTful APIs for core banking services using Node.js, and AWS.
  • Built and deployed scalable infrastructure with Terraform, AWS Lambda, API Gateway, and DynamoDB.
  • Designed and executed unit, integration, end-to-end, and flow tests to ensure system reliability.
  • Contributed to CI/CD pipelines, improving deployment efficiency and service uptime.
  • Delivered a secure and scalable backend API tailored for financial applications.
  • Improved system stability and test coverage, boosting platform reliability and developer confidence.
  • Influenced key architecture decisions, ensuring alignment with business goals and compliance standards.
Project Tech stack:
Node.js
Terraform
AWS Lambda
API Gateway
Amazon S3
DynamoDB
PostgreSQL
Redis
Jest
GitHub Actions

Education

2019
Computer Science
Bachelor’s Degree

Languages

Spanish
Advanced
English
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