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Hans Christian Cristobal
Province of Rizal, Philippines
CodersRank Score

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This represents your current experience. It calculates by analyzing your connected repositories. By measuring your skills by your code, we are creating the ranking, so you can know how good are you comparing to another developers and what you have to improve to be better

Information on how to increase score and ranking details you can find in this blog post.

40.6
CodersRank Rank
Top 6%
Based on:
Stackoverflow 16 events
Top 50
ERB
ERB
Developer
Philippines
Top 50
Ruby
Ruby
Developer
Philippines
Highest experience points: 0 points,

0 activities in the last year

List your work history, including any contracts or internships
ING
Nov 2019 - Mar 2021 (1 year 4 months)
Taguig City, Philippines
Site Reliability Engineer
- Drastically improved observability through the use of monitoring and alerting technologies such as Prometheus, Grafana, ELK stack and PagerDuty
- Go-to guy for Kibana watchers, visualizations and scripted fields
- Made use of Prometheus exporters like node exporter and blackbox exporter to ensure that the bank is running smoothly, utilized grok exporter to make custom metrics when off-the-shelf solutions just won't do
- Documented and democratized knowledge of monitoring tools through runbooks, knowledge transfer sessions, and day-to-day interaction
- Ensured that knowledge is always documented and the docs are always up-to-date
- Participated in 24/7 on-call roster and commanded production incidents
- Participated in post-mortem sessions and worked on action items to ensure incidents won't reoccur
- Participated and led disaster recovery drills
- Became subject matter expert of Core Banking Database, improved tooling, added custom metrics, and made changes to fix issues with vendor's scripts
- Monitored and managed Red Hat Enterprise Linux (RHEL) VMs and OpenShift microservices
- Wrote scripts for tooling and automation in python and bash, reviewed scripts of other SREs
- Managed AWS SNS - SMS, ensured proper cost limits are in place and set up CloudWatch dashboards integrated with PagerDuty to notify the team
- Reduced AWS monthly spend by creating a guide for the marketing team to better understand how SMS billing works and how to format the SMS blasts accordingly, which resulted in significantly lower cost per blast (-75% from previous month)
- Collaborated with developers, architects, database administrators and other SREs to ensure that components of the bank are built with resiliency in mind
- Interfaced with colleagues from Singapore, Poland, Romania and the Netherlands
linux kibana grafana docker nginx squid elasticsearch openshift Pagerduty
Voyager Innovations, Inc.
Jul 2017 - Oct 2019 (2 years 3 months)
NCR - National Capital Region, Philippines
Software Engineer
Attended the Cadetship Program and ranked 3rd in the Core Training section

Assigned to Service Engineering and Operations as a Service Engineer for PayMaya Payment Gateway Team

- Set up, manage, and maintain infrastructure on Amazon Web Services EC2, ECS, Lambda, etc. including security patches and OS hardening
- Reduced error discovery time to <5m using Slack and MS Teams monitoring bots, with 100% of production issues found through it
- Migrated services to ECS from EC2
- Set up a Continuous Integration and Deployment Pipeline using Jenkins and CodePipeline, which is now the main pipeline for services.
- Created Splunk scripts for monitoring and data visualizations
- Performed advanced log processing using Splunk
- Created and managed Puppet configurations for servers
- Responsible for advanced monitoring of PayMaya QR and onboarding of merchants
- Identified issues using logs and various metrics (Splunk, New Relic, Dynatrace)
- Facilitated the AWS SAM module configuration, build, and deployment of the PayMaya Payment Gateway Shopify Connector
- Discussed and gave pointers regarding Docker and ECS setup, infrastructure, and deployment with Service Engineers from other teams
- Created various scripts for AWS Lambda using Ruby, Python, NodeJS and Go, as well as Bash scripts for servers. These scripts range from monitoring, service discovery and deployment to database queries and troubleshooting of servers.
- Participated in regular hardening of servers
- Facilitated load testing on Payment Gateway services
- Participated in meetings and gave suggestions regarding architecture, infrastructure and implementation of services
- Participated in 24/7 on call rotation
- Used Terraform to create and manage the whole infrastructure stack of Load Testing environment and facilitated Terraform adoption across all environments
- Documented infrastructure configurations of Payment Gateway services
AWS postgresql linux Go NodeJS Python Ruby ruby on rails Terraform
Citi
Jun 2016 - Jul 2016 (1 month)
Quezon City, Philippines
Intern
• Worked with the Quality and Control department to improve and/or automate (via VBA) their Excel worksheets and create new ones from scratch to help increase productivity and optimize business processes
• Finished multiple projects for the two Quality sub-departments , including the automation of their main forms and workflow
• Finished multiple projects for the Control sub-department which helped them properly track and automate their various sweeps
• Automated the entitlements document to easily transfer data from multiple sources to the master sheet
• Created an automated points calculator that calculates how many points an employee would have, given their statistics
VBA excel

Add some compelling projects here to demonstrate your experience
Psychological Association of the Philippines Junior Affiliates (PAPJA) and PAPJA Convention Website
Dec 2015 - Dec 2015
MetaTrade Inc. Online Card Trading Marketplace
Dec 2016 - Dec 2016
• Sole back-end developer for MetaTrade Inc.’s website, an online marketplace for card trading (Ruby on Rails, PostgreSQL, Heroku, Amazon S3)
Ateneo Assembly A-Vox
Dec 2014 - Dec 2015

This section lets you add any degrees or diplomas you have earned.
Rizal National Science High School
Dec 2008 - Dec 2012
Ateneo de Manila University
Bachelor's degree, Management Information Systems, Specializing in Enterprise Systems
Dec 2012 - Dec 2016
Amazon Web Services Certified Solutions Architect - Associate
May 2018

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