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Sergio User

@sergiouser4

Backend engineer at Lotusflare building Go services and Kubernetes Operators that provision AWS infrastructure through custom resources.

Mexico

Message

At Lotusflare, I build Go microservices and Kubernetes Operators on AWS EKS, turning manual rollout and infrastructure requests into declarative provisioning. I also developed an operator-driven backup workflow for RDS and Kubernetes, with documented restore runbooks.

Previously, at Petco, I built Go APIs for product, inventory, and order data and an operator that managed Kafka configuration as custom resources. Across my work, I’ve designed backend services and supported engineers through design reviews, code reviews, and mentoring.

Experience

Work history, roles, and key accomplishments

Current

Server Engineer

Current

Lotusflare

Feb 2026 - Present (8 months)

Build Kubernetes Operators in Go with Operator SDK and controller-runtime, reconciling tenant and service custom resources into Deployments, Services, and autoscaling resources. Develop operators that manage AWS resources via the AWS SDK for Go v2, and design RESTful Go services for high availability.

Go Operator SDK Controller Runtime Gin AWS SDK for Go V2 Kubernetes Amazon EKS PostgreSQL Redis Helm Velero Prometheus Grafana Testifying Envtest Kind GitHub Actions

Senior Web Developer

Qentelli

Sep 2024 - Jan 2026 (1 year 4 months)

Led decomposition of monolithic APIs into Go RESTful microservices on AWS EKS, built a Go operator for AWS resource provisioning, and implemented validating admission webhooks. Designed and tuned RDS Aurora PostgreSQL schemas and set testing standards with Testify, gomock, and envtest.

Go Gin Operator SDK Controller Runtime AWS SDK for Go V2 Kubernetes Amazon EKS AWS Amazon SQS Elasticache Aurora RDS IAM PostgreSQL Redis Docker Terraform Testifying GoMock Envtest LocalStack GitHub Actions

Senior Software Engineer

Petco

Jul 2019 - Aug 2024 (5 years 1 month)

Designed and built Go RESTful microservices for e-commerce on AWS EKS, wrote a Go operator for Kafka configuration, and built a Node.js GraphQL layer. Performed PostgreSQL query optimization and owned GitLab CI/CD pipelines.

Go Gin Operator SDK NodeJS NestJS TypeScript GraphQL PostgreSQL Kafka Docker Kubernetes Amazon EKS Helm Testifying GoMock Jest Supertest GitLab CI CD

Technical Lead

Techfirst LLC

Jun 2016 - Jun 2019 (3 years)

Led a team of engineers as technical lead, owning architecture decisions and code review standards. Containerized Node.js services with Docker and Docker Swarm, built an automated voice call center with Twilio, and developed a React Native mobile app backend.

NodeJS Express MongoDB Docker Docker Swarm EC2 Twilio API React Native Jest Jenkins

Full-Stack Engineer

Reachcore

May 2013 - Jun 2016 (3 years 1 month)

Replaced third-party data-processing software with in-house Node.js services, built a Python Django backend integrated with Jira, and used Google Cloud Platform for storage and analytics. Delivered visualization dashboards with Vue.js and D3.