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Marcos Lopez

Senior Full-Stack Engineer specializing in cloud-native web apps and data pipelines

AthelasUCLANew York, NY8 Years ExperienceSenior LevelWorks Remote

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About

Backend/data engineer with healthcare/telehealth domain experience, building patient appointment and data-processing systems on AWS. Has delivered production microservices and ETL pipelines (Flask/Celery, Glue/PySpark) with strong reliability/observability practices (JWT, retries/timeouts, Sentry/CloudWatch) and modernization experience migrating SAS workflows to Python services, including a documented 10min→30sec SQL performance win.

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Key Strengths

  • Built and maintained production telehealth/patient appointment backend APIs (Flask + Celery)
  • Designed reliability patterns: JWT auth, HTTPS, retries with exponential backoff (tenacity), timeouts, Celery retries/time limits
  • Production observability: Sentry alerting, structured logging with Loguru, CloudWatch monitoring/dashboards
  • Delivered AWS serverless + container architecture (Lambda/API Gateway + ECS) with Terraform IaC and CI/CD (GitLab CI, CodePipeline)
  • Implemented AWS Glue ETL to S3 data lake (PySpark, Parquet) with schema discovery (crawlers) and data quality checks
  • Modernized legacy SAS processing into Python microservices using shadow testing, phased migration, parallel runs, and rollback plans
  • Improved SQL report runtime from ~10 minutes to ~30 seconds via indexing, partitioning, query rewrite, and batching
  • Owned and mitigated batch pipeline incident (resource exhaustion) using monitoring/alerts and operational mitigations (batch size reduction)

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Experience

Senior Full-Stack EngineerAthelas · Dec 2024 – Dec 2025
Senior Full-Stack EngineerRobert Half · Sep 2021 – Nov 2024
Frontend/Full-Stack EngineerCoinbase · Oct 2017 – Aug 2021
Full Stack Engineer InternFacebook · Dec 2016 – Sep 2017internship

Education

UCLAbachelor, Computer Science (2016)

Skills

PythonJavaScriptSQLBashReactNode.jsFlaskDjangoREST APIsAPI developmentMicroservicesDockerJenkinsGitAWS

Languages

English

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Connect with Marcos

Marcos already has a relationship with Reval, so a warm intro from us gets a much better response than cold outreach.

Typically responds within 24 hours

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Hire with Reval

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Marcos LopezSenior Full-Stack Engineer specializing in cloud-native web apps and data pipelines