Jesse-Daniel Belleau-Karaskewich Email & Phone Number

Ottawa, On, Ca

Toronto, Canada Area

* Led hands-on cast saving effort resulting in $30,000 USD / month savings. Addressed resource wastage, rightsizing of Production Infrastructure, business-suitable life-cycle policies, and migration to cost-effective AWS Instance types (e.g. Graviton).* Planned and Executed Zero Downtime upgrades of our critical Cassandra Clusters from v3 to v4. Utilized Blue-Green Deployments to ensure no disruption to production traffic.* Reduced Real-Time Fraud Prevention p99 from 120ms to 60ms through system-wide optimizations. Large focus on Cassandra, tuning sub-compaction settings, JVM and server configurations to suit underlying hardware.* Pioneered an Automation Framework to allow advanced interactions with out Infrastructure. Automated deployments, resolutions of alerts, and generation of ad-hoc reports to analyze system performance.* Created and demonstrated a large amount of onboarding material to quickly and effectively get new teams onboarded to working with our system.* Ensured fluid operation, performance, and availability of many aspects of our system including EMR, EKS, ELK Stack, Prometheus/Thanos, Kafka and custom kubernetes deployments.

Toronto, Canada Area

* Analyzed and Optimized thread pool and GC configurations for our Scala Real-time Decisioning System. At 2500 transactions per second, this reduced timeouts by 99% and reduced p99 response time from 250ms to 160ms.* Implemented a feature to consolidate queries to Cassandra before executing, reducing overall load on Cassandra by 20% while not impacting response times.* Greatly improved our monitoring by adjusting our Kamon/Prometheus reporting configuration to more accurately represent our response times and provide more frequent metric updates.* Added various metrics to our Application logs being ingested into Elasticsearch. Using these metrics, Kibana Dashboards were created to allow for detailed performance analysis on live and historical traffic.* Created and extended detailed runbooks to handle PagerDuty alerts and various Maintenance procedures spanning across our entire infrastructure (k8s, Kafka, Cassandra, EMR, ELK)◦ Became a primary contact point for new team members onboarding onto the project. Provided training and on-going advice on how to navigate/improve the system.* Managed infrastructure through Terraform modules and many Kubernetes applications. Changes included AWS networking setup, migrating resources from EC2 to Kubernetes, and rolling out/monitoring application deployments

Toronto, Ontario, Canada

* Created a .NET Core, cloud-native, micro-service application to consolidate the various programs our client used to manage their business and physical infrastructure. The programs were from previous acquisitions, so the new application was built to support current business as well as easy setup of future acquisitions.* Defined a local caching strategy for API Requests from our Angular 8 application. Utilized NgRx to maintain application state and cache common request responses. By short-circuiting requests using cached responses, loading times during sustained use of the site decreased by 35%.* Established standards on the use of new report tooling that communicated directly with the database cluster. This included standards on writing stored procedures, designing reports using a standalone designer, and developing components to aid with end-user interaction. Developers new to the tool could then complete complex stories within 2 weeks.* Implemented a Job Scheduling system that utilized CloudWatch Events and Step Functions to trigger Lambdas across CloudFormation stacks. The approach was data driven to allow for easy configuration. An administration system allowed system admins to view and manage jobs from the Frontend, as well as schedule new jobs.* Implemented an Event dispatching service to filter and relay incoming messages using DynamoDB, SNS and SQS. Compared to the legacy system, this allowed messages to be accepted, transmitted and consumed on an on-demand basis instead of a scheduled basis.* Actively mentored our Interns on a foreign technology stack to ensure success in their time-constrained project.

Toronto, Canada Area

Developed and deployed a Content Management System to promote the internal Agile Methodology used at Slalom. Drupal backend was extended to meet the needs of the client, and complex frontend components were developed using Vue.js.Worked within a small 5 person team, and alongside multiple remote teams from Boston and Seattle. Together we practiced daily and bi-weekly Agile ceremonies to efficiently produce a fully functional system.

St. Catharines, Ontario, Canada

Created a battery of psychological tests using EPrime and Inquisit, based off of established studies.Used Python to automate all of the tests. Utilized tests created from different studies in JavaScript.Established personal schedule to meet deadlines.Communicated with client to ensure proper implementation of requirements.

St. Catharines, Ontario, Canada

Assist students with all things Computer Science, including help with concepts and assignments. Also assist in debugging difficult to solve problems, and setting up various required environments.

Test specific aspects of a client's website/app, providing insights as to how a user would navigate and interpret the information provided, or how a user would attempt to accomplish certain tasks (e.g. Finding contact information, opening hours, scheduling an appointment, etc...).

Ontario, Canada

Maintain and develop a large code base of internal applications that are used daily.Address unexpected bugs quickly and efficiently.Create end user documentation.

333 Ontario Street

Ensured safety of guests by enforcing rules and regulations.Promoted enjoyment of guests with enthusiasm and creativity to suggest fun activities.Assisted in maintaining appearance of facility.