David Kjerrumgaard Email & Phone Number

San Francisco, California, Us

Helping developers use Apache Pulsar and growing the open-source community around it.

San Francisco, California, Us

Software Engineer working on Splunk's Data Streaming Platform tools.

Palo Alto, California, Us

Santa Clara, California, Us

Responsible for developing and delivering professional services offerings around the Hortonworks DataFlow stack, including Apache NiFi & Apache Metron

Santa Clara, California, Us

Systems Architect – Global Communications Company, Hadoop As a ServiceInstalled, configured, and benchmark Hadoop on a 1000+ node cluster in order to establish baseline performance metrics and SLAs prior to releasing the clients Hadoop as a Service (Haas) offering to the general public.• Worked closely with System Administrators, developers, and key business leaders to establish SLAs and acceptable performance metrics for the Hadoop as a service offering• Installed, configured, and optimized the Hadoop cluster on client’s existing infrastructure. • Conducted cluster sizing, tuning, and performance benchmarking on a multi-tenant OpenStack platform to achieve desired performance metrics.Installed, configured, and benchmark Hadoop on 60+ HDD machines in order to establish baseline performance metrics and SLAs prior to releasing the clients Storage as a Service (Haas) offering to the general public.• Installed, configured, and optimized the Hadoop cluster on client’s existing infrastructure. Developed several scripts and MapReduce programs in support of data saturation testing. Systems Architect – Cross-media advertising Company, Clickstream AnalysisPerform analysis on large dataset of customer behavior in the online advertising industry in order to identify economic patterns based on their past behavior, geographic location, and demographic information. • Developed data ingestion framework in order to aggregate data from web logs, pixel data, and third party demographic database using Apache Flume, Sqoop, and Hadoop streaming. • Worked closely with client development staff to produce ad-hoc queries, and data analysis on newly created cross-platform dataset using Apache Hive and Pig. • Applied machine learning methods, principal component analysis, and regression testing on the dataset to build a predictive model for click through rate and target marketing using Mahout.

Las Vegas, Nevada, Us

• Helped design and develop a custom purchase order system for an e-commerce company with over $2 Billion in annual revenue. This system is utilized by both internal buyers and over 1500 external vendors to maintain the company inventory.• Responsible for designing, developing, and maintaining the software that handles all inbound and outbound EDI documents to and from our suppliers including purchase orders, advance ship notices, and invoices. • Developed software to integrate data from our purchase order system into our internal SAP system for billing and accounts payable as well as the Amazon.com inventory system to enable inventory sharing.• Generate ad-hoc reports to the business team to assist in the resolution of production issues and recommend / implement solutions to the problems identified. Technologies utilized include: EC2, Apache Camel, Apache CXF, iBatis, Java, Oracle, and Spring 3.0.

• Built data analytics platform for health insurance segment utilizing Hadoop, Pentaho, and Semantic technologies such as RDF, OWL, and Jena.• Data analytics platform provided benchmarking, scoreboarding, and future cost prediction along with standard BI reports• Developed a custom framework for integrating data from disparate internal and external data sources into our OLAP database on DB2. Wrote automated reports against the data warehouse to capture key performance and cost of care metrics for the business, such as cost-per-episode rather than a per claim basis.

• Responsible for the development of both the passport.fedex.com and autotrans.fedex.com web sites as well as internal web application used by customer service team for rate quotes and order entry and scheduling. Technologies utilized include: Ajax, Cascading Style Sheets, HTML, JSF, Java, Hibernate, and Oracle.

Cleveland , Ohio, Us

• Application architect and lead developer for J2EE-based checking account management application that provides account services such as stop payment requests, photocopy request, and check imaging to corporate customers. Technologies utilized included Enterprise Java Beans, Servlets, JSPs, and Jakarta Struts.

Independence, Oh, Us

• Spearheaded the effort to transition an existing CORBA-based claims system to the J2EE platform. Installed & configured Websphere 4.0 application server cluster on Linux platform, developed complex EJB component modules, and instructed junior developers on J2EE technologies. Technologies utilized included Enterprise Java Beans, Servlets, JSPs, and Jakarta Struts.

Gomersal, Gb

• Served as application architect for J2EE-compliant insurance policy point-of-sale application Lead all aspects of product development, including requirements gathering, system & software design, proof-of-concept implementation, database design, software development (both hands-on and mentoring/leading), testing and system acceptance. Technologies utilized include: Enterprise Java Beans, ActiveMQ, Jakarta Struts, Weblogic, Oracle and DB2.

As a consultant for Information Control Corporation, participated in a number of major projects for fortune 500 clients within the automotive and transportation industries, including FedEx and Rockwell Automation

Bethesda, Md, Us

As a simulation and training software engineer, I worked on several multi-million dollar flight simulators for the U.S. and foreign governments.Developed autonomous intelligent agents that served as opposing forces for the pilot within a tactical simulation environment using C++ and Ada.

Master Of Science - Ms, Computer Science

Bachelor Of Science - Bs, Computer Science