Cesar Alejandro Llanes Florez

Activities

• Designed, documented, and implemented compliance technology processes and procedures required by regulatory entities to obtain the operational banking license in Colombia.
• Designed and implemented a secure, scalable AWS infrastructure to support a banking platform.
• Automated infrastructure deployment and environment promotion using Jenkins, Terraform, and GitHub Actions.
• Performed cloud architecture assessments using the AWS Well-Architected Framework to identify and remediate design gaps.
• Conducted vulnerability assessments and implemented remediation plans to enhance security posture.
• Led story prioritization and sprint planning for the DevOps team to ensure timely and aligned deliverables.
• Designed a multi-region replication architecture on AWS using DynamoDB Global Tables, Amazon Aurora MySQL, and S3 cross-region replication.
• Integrated generative AI solutions (OpenAI, Hugging Face, Ollama, DeepSeek R2) into automated workflows with n8n for text generation, database analysis (PostgreSQL/MySQL), and operational process automation, deploying services via Docker and FastAPI.

Key Achievements

• Successfully secured the operational banking license in Colombia for the country’s first fully digital bank.
• Led and mentored DevOps and infrastructure teams to enhance performance and reliability.
• Designed and implemented a multi-region disaster recovery strategy using AWS services to ensure high availability and resilience
• Transitioned the DevOps team to a fully remote work model during the COVID-19 quarantine without compromising effectiveness.
• Maintained team performance and goal achievement even during bank restructuring and staff reduction processes.
  

Activities

• Design microservices arquitecture.
• AWS Common services administration (VPC, EC2, RDS, Dynamo, S3)
• AWS Serverless platform like lambdas, apigateway.
  
• AWS SQS, Kinesis, Firehose, SES
• AWS DMS, Glue, EMR.
• AWS EKS, ECS, ECR, Fargate, Beanstalk.
  
• RDS Serverless (Aurora postgresql)
• Redshift spectrum
  
• AWS DocumentDB.
  
• AWS Workspaces.
• Istio service mesh.
• Calico network policies.
• Database administration like Postgresql, Mysql.
• Non-relational database administration like mongodb, cassandra, etcd.
• Messages queues with rabbitmq, redis, activemq, sqs.
• Data streaming processing with kafka, dask and spark.
• Pub/Sub messaging with kafka and zookeeper.
• Containers technologies like docker, rkt, lxc, cri-o, kata-containers, freebsd jails.
• Source code repositories management with git and svn.
• Reverse proxy with apache2, nginx, haproxy, traefik.
• Jenkins CI/CD.
• Configuration management with puppet, ansible, chef and coreos ignition.
  
• IaaC Terraform/CloudFormation.
• ELK stack.
• Kubernetes from scratch.

Key Achievements

• Head of the infrastructure, devops and security teams.
  
• Successful migration from standalone containers to auto-scalable cluster containers.
  
• Design and deployments of resilience production platform across different AWS regions.
  
• Acceleration of developments process through ci/cd pipelines.
  
• Conformation of an area of
  
  devops and infrastructure in the company, and growth of it.
• Deep understanding of kubernetes control plane.
  
• 
  

Activities

• Automate administrative tasks with Puppet.
  
• Vcenter implementation and administration.
  
• Implementation and administration of Vmware virtualswitch, and vlan deployments.
  
• Design and implementation of backup plan and DRP for esxi virtual machines.
  
• Monitoring tools like snmp, zabbix, new relic.
  
• Fortinet administration.
  
• Installation, tuning, admon unix/linux SO.
  
• HP 3Par Storage Management.
  
• HP Blades Management.
  
• Configuration and admon of HP switchs.
  
• Postgresql, Mysql administration..
  
• Reverse proxy with apache2, nginx.
  
• Java servers installation and administration like Jboss, tomcat and glassfish.
  
• Jboss, Glassfish and Payara clustering.
  
• Azure console Management.
  
• AWS console Management.
  

Key Achievements

• Design and deployment of cluster architecture for java applications on AWS and Azure; ensuring the availability of the services and improve the response times.
  
• Implement a replication plan for Mysql databases on schema Master - slave.
  

Activities

• Deployment java applications on Jboss, Tomcat, glassfish and gigaspaces.
  
• Amazon Console Administration AWS.
  
• Rackspace console administration.
  
• Middleware administration.
  
• PostgreSQL replication with streams and Slony-I
  
• Audit Linux Servers and apply security.
  
• Red Hat 6 administration.
  
• Migration of Svn repos.
  
• Administrative task automation with perl and bash.

Key Achievements

• Implement a glassfish application cluster, in order to provide high availability for the system where all sensitive financial information was stored, after it was encrypted by hardware cryptographic system.
  
• Set up a postgresql server replication environment, configuring slony in order to have replication between different versions postgresql servers and multiple slaves.
  

Activities

• Design and implementation infrastructure solutions.
  
• Migration MySQL databases.
  
• Mysql Master - Slave replication setup.
• CentOS 5|6, Ubuntu server administration.
  
• Hyper-V Installation and administration.
  
• ESXI Installation and administration.
  
• Windows Server 2012 administration.
  
• Oracle Virtual Machine installation and administration.
  
• Vmware Virtual Machines migration.
  
• Vmware environments Migration.
  
• Implement high Availability solutions with Heartbeat and DRBD.

Key Achievements

• Migration of bare metal servers to virtual environments with high availability.

Activities

• Data Mining.
  
• CRM Implementation with sugarCRM.
  
• Workflow implementation with processmaker.
  
• PostgreSQL, Mysql and Sql Server administration.
  
• Red Hat 6 administration.
  
• Mysql database schema design.

Key Achievements

• Configuration of Sql Server replication through transaction and snapshot replication services.
  

Activities

• KVM Virtualization.
  
• Red Hat, CentOS and Ubuntu Server Administration.
  
• Mysql, Oracle 9i installation and administration.
  
• Implementing mail servers on freeBSD.
  
• Middleware administration (Websphere, Weblogic, Jboss and Tomcat)
  
• Nginx as reverse proxy.
  

Key Achievements

• Replication of bidirectional data between Mysql and Oracle 9i, using pike and perl scripts.
  
• Migrate Mysql servers from Linux to FreeBSD in order to improve the network performance, thanks to advanced features of freebsd network stack; and take advantage of the easily take and maintance the filesystem snapshots using zfs tools.
  

Activities

• Mysql Master/Slave cluster.
  
• CentOS, Ubuntu and freeBSD administration.
  
• Develop with PHP and jQuery, integration with Jabber.
  

Key Achievements

• Starting to work with Mysql Replication, and understand how the replication work in depth.
  

• CTI integrations using Php, Perl, Python, Mysql, Oracle and Asterisk PBX
  
• KVM virtualization on CentOS and Ubuntu server.
  
• High Availability with DRDB
  
• Apache and nginx configuration.
  
• PBX implementation with asterisk.
  

Key Achievements

• I learned how to develop AGI (CTI) applications, through which the caller users can interacts with a pbx system, and query or update data just making a phone call.
  

Activities

• Windows server 2003/2008 administration.
  
• Sql Server and Mysql server administration.
  
• Checkpoint firewall management.
  
• Asterisk telephony PBX.
  
• Red Hat and Debian Administration.
  
• IIS and Exchange administration.
  
• Proxy Squid with SquidGuard and Ad authentication.
  
• IT monitoring with nagios, jffnms, cacti, snort and smokeping.
  
• Automatic backup using bash scripts and tape libraries.
  

Key Achievements

• Setup replication with Sql Server 2005.
  
• I Took part in a big migration project for replace an old information system based on a mainframe and computer terminals (dumb terminals), with a new web application made with C# .Net and Sql Server.
  
• Design and implement of backup and recovery plan for production databases on Sql Server and Mysql; using Bash, freetds and tapes backups.