Senior Database Administrator
CBTS, Nashville, TN, United States
CBTS serves enterprise and midmarket clients in all industries across the United States and Canada. CBTS combines deep technical expertise with a full suite of flexible technology solutions--including Application Modernization, Managed Hybrid Cloud, Cybersecurity, Unified Communications, and Infrastructure solutions. From developing and deploying modern applications and the secure, scalable platforms on which they run, to managing, monitoring, and optimizing their operations, CBTS delivers comprehensive technology solutions for its clients' transformative business initiatives. For more information, please visit www.cbts.com.
OnX is a leading technology solution provider that serves businesses, healthcare organizations, and government agencies across Canada. OnX combines deep technical expertise with a full suite of flexible technology solutions—including Generative AI, Application Modernization, Managed Hybrid Cloud, Cybersecurity, Unified Communications, and Infrastructure solutions. From developing and deploying modern applications and the secure, scalable platforms on which they run, to managing, monitoring, and optimizing their operations, OnX delivers comprehensive technology solutions for its clients’ transformative business initiatives. For more information, please visit www.onx.com.
Job Summary We are seeking an experienced
Cassandra & MongoDB Administrator
responsible for managing, maintaining, and optimizing large-scale NoSQL database environments. The ideal candidate will ensure high availability, performance, security, and scalability of Cassandra and MongoDB clusters across development, test, and production environments.
Key Responsibilities Database Administration & Operations
Install, configure, upgrade, and manage
Apache Cassandra
and
MongoDB
database clusters
Ensure
high availability, fault tolerance, and disaster recovery
across multi-node environments
Perform routine database maintenance including patching, compaction tuning, and index management
Manage backup, restore, and archival strategies for both Cassandra and MongoDB
Performance & Optimization
Monitor database performance, latency, throughput, and resource utilization
Tune Cassandra (GC, heap, compaction, read/write paths) and MongoDB (indexes, queries, sharding)
Analyze slow queries and optimize schema designs in collaboration with application teams
Handle capacity planning and scaling (horizontal and vertical)
High Availability & Disaster Recovery
Manage replication, clustering, and sharding
Configure and support multi-datacenter Cassandra clusters
Implement MongoDB replica sets and sharded clusters
Test and execute DR drills and recovery procedures
Monitoring & Troubleshooting
Set up and maintain monitoring tools (Prometheus, Grafana, Ops Manager, or equivalent)
Proactively identify issues and resolve production incidents
Perform root cause analysis for outages and performance degradation
Security & Compliance
Implement database security best practices including:
Authentication & authorization
Encryption at rest and in transit
Role-based access control (RBAC)
Support compliance requirements and audit needs
Automation & Collaboration
Automate routine DBA tasks using
Shell, Python, or Ansible
Work closely with DevOps, SRE, and application development teams
Assist teams with schema design, data modeling, and query optimization
Document operational procedures, standards, and runbooks
Required Skills & Qualifications Technical Skills
Strong hands-on experience with
Apache Cassandra
Strong hands-on experience with
MongoDB
(Replica Sets & Sharded Clusters)
In-depth knowledge of:
NoSQL data modeling
CAP theorem concepts
Consistency levels and replication strategies
Experience with Linux/Unix systems
Proficiency in scripting (Shell, Python, or equivalent)
Experience with backup tools, monitoring solutions, and alerting systems
Preferred Skills
Experience with cloud platforms (Azure / AWS / GCP)
Exposure to Kubernetes and containerized database deployments
Knowledge of CI/CD pipelines and Infrastructure as Code (IaC)
Understanding of streaming or big data ecosystems (Kafka, Spark – optional)
Soft Skills
Strong problem-solving and analytical skills
Ability to work under pressure in production environments
Good communication skills and stakeholder collaboration
Willingness to participate in on‑call support rotations
Education
Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent experience)
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OnX is a leading technology solution provider that serves businesses, healthcare organizations, and government agencies across Canada. OnX combines deep technical expertise with a full suite of flexible technology solutions—including Generative AI, Application Modernization, Managed Hybrid Cloud, Cybersecurity, Unified Communications, and Infrastructure solutions. From developing and deploying modern applications and the secure, scalable platforms on which they run, to managing, monitoring, and optimizing their operations, OnX delivers comprehensive technology solutions for its clients’ transformative business initiatives. For more information, please visit www.onx.com.
Job Summary We are seeking an experienced
Cassandra & MongoDB Administrator
responsible for managing, maintaining, and optimizing large-scale NoSQL database environments. The ideal candidate will ensure high availability, performance, security, and scalability of Cassandra and MongoDB clusters across development, test, and production environments.
Key Responsibilities Database Administration & Operations
Install, configure, upgrade, and manage
Apache Cassandra
and
MongoDB
database clusters
Ensure
high availability, fault tolerance, and disaster recovery
across multi-node environments
Perform routine database maintenance including patching, compaction tuning, and index management
Manage backup, restore, and archival strategies for both Cassandra and MongoDB
Performance & Optimization
Monitor database performance, latency, throughput, and resource utilization
Tune Cassandra (GC, heap, compaction, read/write paths) and MongoDB (indexes, queries, sharding)
Analyze slow queries and optimize schema designs in collaboration with application teams
Handle capacity planning and scaling (horizontal and vertical)
High Availability & Disaster Recovery
Manage replication, clustering, and sharding
Configure and support multi-datacenter Cassandra clusters
Implement MongoDB replica sets and sharded clusters
Test and execute DR drills and recovery procedures
Monitoring & Troubleshooting
Set up and maintain monitoring tools (Prometheus, Grafana, Ops Manager, or equivalent)
Proactively identify issues and resolve production incidents
Perform root cause analysis for outages and performance degradation
Security & Compliance
Implement database security best practices including:
Authentication & authorization
Encryption at rest and in transit
Role-based access control (RBAC)
Support compliance requirements and audit needs
Automation & Collaboration
Automate routine DBA tasks using
Shell, Python, or Ansible
Work closely with DevOps, SRE, and application development teams
Assist teams with schema design, data modeling, and query optimization
Document operational procedures, standards, and runbooks
Required Skills & Qualifications Technical Skills
Strong hands-on experience with
Apache Cassandra
Strong hands-on experience with
MongoDB
(Replica Sets & Sharded Clusters)
In-depth knowledge of:
NoSQL data modeling
CAP theorem concepts
Consistency levels and replication strategies
Experience with Linux/Unix systems
Proficiency in scripting (Shell, Python, or equivalent)
Experience with backup tools, monitoring solutions, and alerting systems
Preferred Skills
Experience with cloud platforms (Azure / AWS / GCP)
Exposure to Kubernetes and containerized database deployments
Knowledge of CI/CD pipelines and Infrastructure as Code (IaC)
Understanding of streaming or big data ecosystems (Kafka, Spark – optional)
Soft Skills
Strong problem-solving and analytical skills
Ability to work under pressure in production environments
Good communication skills and stakeholder collaboration
Willingness to participate in on‑call support rotations
Education
Bachelor’s degree in Computer Science, Information Technology, or a related field (or equivalent experience)
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