Christopher Leyon Email & Phone Number

Radnor, PA, US

Menlo Park, CA, US

Philadelphia, Pennsylvania, US

• Configured, developed, and maintained all company-wide AWS resources using HashiCorp's Terraform application.
• Created Terraform modules for orchestrating and managing all AWS resources.
• Used Packer to provision AWS EC2 instances running FreeBSD configured as bastion/jump hosts.
• Used Packer and Ansible to provision AWS Linux~2 instances acting as development hosts for Docker containers, Datadog statistics collector, and database frontend.
• Wrote a Synthetic Transaction Monitor to monitor the health of critical infrastructure endpoints. This AWS Lambda function was written in Go and reported any anomalous results to AWS CloudWatch.

Boca Raton, Florida, US

• Senior engineer on team tasked with implementing automated Continuous Delivery for software release management. Utilized and wrote plugins for XebiaLabs applications for deployment automation (XL Deploy) and release.
• Wrote scripts in Python, Korn shell, and Powershell to deploy applications on AIX, Windows, and Linux.
• Performed software deployments to QA, UAT, and Production environments during designated release windows.
• Initiated and championed changes to release management culture to follow latest DevOps best practices.

• Led initiative to migrate all production systems to Amazon AWS cloud infrastructure. Identified and created resources, then devised and implemented migration plan.
• Re-engineered job scheduling mechanism from time-based to dependency-based; utilized correct locking to enforce process synchronization.
• Upgraded all operating systems from Fedora Linux to CentOS 7.

Wayne, PA, US

• Member of DevOps team. Designed, coded, and supported applications using an Agile development methodology.
• Developed device statistics collection and reporting system. Gathered detailed resource usage statistics from Cisco Nexus 1000V and Nexus 7000 series switches, Juniper NS 5400 firewalls, Cisco UCS 6000 series fabric.

• Worked as a developer writing programs in C++, Python, Perl, and Fortran.
• Wrote programs to parse and split incoming data feed files for importing into QED accounting system. Feeds read from: Alliance Bernstein, Barclays, BNY Mellon, Charles Schwab, Credit Suisse, Deutsche Bank, Fidelity.
• Designed and implemented a job scheduler. Devised C++ classes to implement business calendars, recurring dates and times, and support classes for users, permissions, and job templates. Wrote server application to.

• Responsible for new application development, system administration, and network operations for the trading and database machines running Fedora Linux.
• Wrote application to create a "continuous" futures contract from available individual contracts. Implemented algorithms requiring knowledge of rollover heuristics and contract-specific information including price.
• Implemented virtualization on production network, including specifying and procuring servers, configuring virtualized instances, NAS appliance, and iSCSI targets for network storage, and failover/recovery procedures.

New York, NY, US

• Member of the R&D Equity Index team, responsible for writing software to compute pricing and analytical data for equity indices such as S&P 500, Dow Jones Industrials, and others. Maintained index membership, weights.
• Created corporate actions historical database allowing users to trace securities' history by tracking changes in ticker symbols, security listings/delistings, and identifier changes (CUSIP, ISIN, SEDOL, etc). Wrote.
• Local classification database provided a complete description of equity classification codes on local exchanges for emerging markets (China, Philippines, Indonesia, et al). Wrote programs to parse and load raw data.

Princeton, NJ, US

• Configured embedded Linux for custom-built terminal adapter board. Architecture was a Motorola PowerPC CPU communicating via serial line to Intel 8051 microcontroller.
• Wrote customer invoicing system utilizing Ruby, PostgreSQL, and LaTeX. Included capability to charge credit cards or submit ACH transactions.
• Created web pages in PHP and Javascript to manage sales commissions.
• Wrote stored procedures to detect potential fraud in WiLine's VoIP service.

• Responsible for all computer functions, maintenance, and resources for a stock trading office.
• Analyzed technical requirements to design solutions which solved business needs.
• Programming in C++, Perl, and Bourne shell.
• Red Hat Linux system administration: Configuration management, software release and security updates.
• Network management: Security administration for internal network and Internet firewall, maintained real-time network connection to broker with hot fail-over.
• MySQL database administration: Database structure definition, performance tuning and optimization.

Princeton, NJ, US

Developed and enhanced capabilities for IP network data recording, intrusion detection, and forensics. Niksun's products utilized the FreeBSD kernel and device drivers, patented BPF packet filter routines, a database optimized for efficient storage and retrieval of PCAP records, and a statistics generator to summarize data characteristics.

• Provided production support for OMR's Trading Assistant application, which ran on Digital OpenVMS and versions of Unix from IBM, Sun, DEC, and Hewlett-Packard. TA's Back Office comprised over 6,000 COBOL modules; the.
• Wrote customized shell, Perl, and DCL scripts.
• Installed and administered SuSE Linux web/file server.