Mihai Cristu

Experience

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  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

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  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

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  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

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  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