Mihai Cristu

Mihai Cristu

Value Added Services Engineer

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location of Mihai CristuRomania

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  • Timeline

  • About me

    Senior DevOps Engineer | AWS Certified Solutions Architect

  • Education

    • University POLITEHNICA of Bucharest

      2002 - 2007
      Engineer Electronics and Telecommunications
  • Experience

    • COSMOTE Mobile Telecommunications S.A.

      Sept 2007 - Oct 2011
      Value Added Services Engineer

      Part of a Team that was in charge of maintaining, upgrading, configuring, optimizing and developing software for Cosmote VAS platforms: SMSC, VMS, WHC (Who Called), Fun Dial, USSD GW.Some of the activities performed by myself during this time at Cosmote were:- Oversaw the installation, performed ATP (Acceptance Tests) for the following platforms: SMSC, Fun Dial, USSD GW, PPGW (Prepaid Gateway).- Developed many tools for debugging, log gathering, statistics building, mostly for SMSC.- Developed an SMPP GW application that is currently used by external VAS providers to connect to Cosmote SMSC (in C programming language)- Developed Bulk SMS Gateway application that is used for high speed bulk sending by marketing department, with features like user authentication, per user delivery reports, real time bulk status and speed limitation. (PHP, Kannel)- I was in charge of connecting external VAS providers to Cosmote SMSC and configuring short codes and alphanumeric senders for them- Developed flows for Cosmote USSD Menu service. (Java, Eclipse) Show less

    • SIMartis Telecom

      Oct 2011 - Nov 2017
      Operation, Maintenance and Support Engineer

      Part of a Team responsible for providing infrastructure for Testing and Development departments and all levels of support for customers- Installing our application for new clients on own or client’s infrastructure, solution being based on JBoss Server - Monitoring / optimizing / statistics & reporting for live installations, providing all levels of support for our clients (Zabbix, custom tools built in PHP/python/Bash)- Building and optimizing databases based on MySql Server High Availability (Master -Master replication)- Adding extra modules to our applications in the form of scripts (Bash, PHP, Perl, Python, Etc.) – an example is a Billing module for a monthly subscription type of service Show less

    • Ericsson

      Dec 2017 - Apr 2024
      DevOps Engineer

      Part of Team responsible for building and maintaining Connected Vehicle Platform where Ericsson and OEM Customers (e.g. Car Manufacturers) host applications exposed to their clients (car drivers).- Constructing and maintaining infrastructure in AWS Cloud (EC2 Instances, Security Groups, VPC, Route53, S3, ECR, Postgres, MySql, Oracle, IAM, etc.), Google Cloud (VMs, Google Kubernetes Engine, etc.)- Leveraging services like ActiveMQ, Kafka, Cassandra, OpenID Connect, Nginx, Docker, Keycloak, LDAP, BigIP.- Building and maintaining Logging / Monitoring solutions based on Elasticsearch Stack, Prometheus / AlertManager / Grafana.- Working in SAFE Agile Hybrid methodology (Scrum Board & Kanban Board).- Infrastructure as Code (terraform, ansible, python, bash, etc).- CI/CD: GoCD, Gitlab, Jenkins.- Versioning: Git, Gerrit, Gitlab, Bitbucket. Show less

    • Luxoft Romania

      Apr 2024 - now
      DevOps Engineer

      Working for customer project involving migrating CI/CD infrastructure fromBitBucket+Jenkins to GitLab. The scope for this project includes building automationfor maintaining GitLab groups, projects, permissions, protected branches andenvironments, MR rules for a multi-team kind of setup, together with creating GitLabrunners in AWS via terraform – we have EC2, Fargate and EKS type runners.Also my team manages other resources used by many teams, like AWS Sagemaker,AWS MWAA, Snowflake, etc. This is done in the same way, with IaC –terraform/terragrunt code triggered from GitLab pipelines. Show less

  • Licenses & Certifications

    • AWS Certified Solutions Architect – Associate

      Amazon Web Services (AWS)
      Feb 2023
      View certificate certificate