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About

Douglas Oliveira da Silva

Senior Database Reliability Engineer and founder of O. S. Technology. Started in 2011 as a database intern and now runs mission-critical SQL Server environments at global scale.

Background

Database operations treated as code: configuration with Chef, infrastructure with Terraform and automation with PowerShell. Experience with mission-critical databases in logistics and geolocation, contact centers, banking-as-a-service and enterprise SaaS, on-premises, on Azure and on AWS.

The company

O. S. Technology turns this experience into consulting and products, delivered remotely. imob.os, AlertaBug and Estação Sonho were built and are operated by the company on its own Kubernetes cluster, to the same engineering standard applied to client environments.

Career

Experience

  1. Apr 2025 – present

    Coupa Software

    Senior Database Reliability Engineer

    • Large-scale SQL Server 2019, 2022 and 2025 behind a global SaaS platform.
    • Database infrastructure on AWS (EC2, S3, FSx) as code with Terraform and Spacelift; configuration with Chef.
    • PagerDuty on-call, upgrades and maintenance across distributed environments.
  2. Aug 2018 – Apr 2025

    Bankly (Acesso Soluções de Pagamento)

    DBA → Senior DBA → Lead Database Reliability Engineer

    • Principal DBA for SQL Server Always On clusters on AWS and Azure, plus RDS, Aurora MySQL and PostgreSQL, DynamoDB and RavenDB, in multi-region environments.
    • Moved ~100 databases (3 TB) between AWS accounts with about 3 seconds of downtime.
    • Pull-request schema change pipeline on GitHub Actions, with idempotent, reviewed scripts.
    • Automation, monitoring and alerting with the SRE team (Dynatrace, Zabbix, PowerShell, Docker, Kubernetes, Terraform).
  3. Oct 2017 – Aug 2018

    VoxAge

    Database Developer

    • T-SQL, SSIS packages and SSRS reports for one of the company’s largest customers; recurring reports on slow queries and resource usage.
  4. Apr 2011 – Jul 2017

    Maplink

    Intern → Database Administrator

    • Principal DBA for SQL Server (2008 R2 to 2016) on-premises and in a private cloud, and for PostgreSQL with PostGIS on RDS.
    • The company’s first Failover Clusters and Always On; migrated ~60 databases up to SQL Server 2016 on AWS.
    • Geographic stored procedures that turn addresses into coordinates, tuned with spatial indexes.

Education

Education and training

  • Associate degree in Databases — Faculdade Sumaré (2011–2013)
  • Technical course in Computing — ETEC Heliópolis (2010–2011)
  • HADR and Windows Server Failover Clustering — Power Tuning (2020)
  • Day-to-day DBA tasks — Fabrício Lima Soluções em Banco de Dados (2017)
  • MCSA SQL Server 2012 track and C# Programming — Green Treinamentos (2014)