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Senior Database Administrator (Freelancer)

Mactores

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About the role

Mactores is seeking a Senior Database Administrator to support their remote Oracle-to-PostgreSQL migration initiatives. In this role, you will manage Amazon Aurora PostgreSQL environments, overseeing the entire process from cluster design to post-go-live stabilization. Your responsibilities will include addressing issues related to replication lag, workload performance, and incident escalation beyond Level 2 support. The position emphasizes the importance of production judgment, as you will be tasked with resolving complex problems that arise during the migration process. The ideal candidate should possess extensive experience in database administration, particularly with PostgreSQL and Oracle systems. Familiarity with AWS services, especially DMS, is essential for success in this role. Strong analytical and troubleshooting skills are necessary to diagnose and resolve issues effectively. This freelance position allows for remote work, making it suitable for professionals who thrive in flexible environments. The role is designed for individuals who can take ownership of critical production systems and ensure smooth operational transitions for businesses relying on these migrations.

The advert

Mactores is the agent-native AWS modernization firm. Most modernization work doesn't ship, it stalls in pilots, slips a year, or lands at three times the budget. We exist to ship it: production systems running, legacy retired, outcomes measured. Our delivery is built on Aedeon, the agent platform built by Mactores' founders' sister company, which absorbs the repetitive 60–70% of engagement work, discovery, dependency mapping, validation, test generation, that traditional consulting bills human hours against. Forward-deployed engineers own the rest: architecture, judgment, and cutover, on dates we commit to in the contract. Oracle-to-PostgreSQL migrations don't fail at conversion. They fail at go-live DMS latency nobody diagnosed, autovacuum behavior nobody tuned, privilege mappings nobody tested, incidents nobody owns at 2 a.m. This role sits inside our Application & Database Modernization pillar and exists to make sure that doesn't happen. As our Senior Database Administrator, you'll run the Amazon Aurora PostgreSQL environments in an active Oracle-to-PostgreSQL migration program from cluster design through DMS replication through post–go-live stabilization. Aedeon handles the repeatable conversion and validation work; you own what agents can't: production judgment. When replication lags, when a workload misbehaves after cutover, when an incident escalates past L2, you're the person who resolves it and can explain why it happened. This is a freelance engagement, remote, working as the L3 escalation point on production systems that real businesses run on.

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