4 Circles has extensive experience working with energy sector clients on projects involving legacy code conversion, database integration, and adoption of open source technologies. Some key projects included converting hard coded legacy code to be more generic, connecting Excel to Access databases, enhancing solar data hub code to use Spring and Hibernate, and deploying applications to the cloud. 4 Circles also performed research on time series databases and trained energy experts on NoSQL databases. Clients included Siemens USA and the National Renewable Energy Laboratory.

1. Energy Sector
4 Circles has worked in energy industry. A
few of the projects:
• Converted hard coded legacy code and
made it generic by passing in parametrs.
Excel, VBA
• Coded in VBA to connect to Access
database to grab reports into Excel.
• Enhanced legacy code in Solar Data Hub
to use Spring, Hibernate with RESTful
technology.

2. Energy Sector Contd….
• For smartgrid.gov (USA), converted legacy
code to use latest open source
technology.
• Deployed into Cloud, solar data hub and
smart grid applications.
• Used Spring Batch framework to convert
ASCII files to time series data files to load
into NoSQL databases.
• Researched on time series
databases, connectors using SCALA, …
protocols.

3. Energy Sector Contd….
• Compared Timeseries databases with ERP
software applications for Energy sector between
different vendors like OSiSoft (PI System), open
systems like Cassandra, MongoDB etc.
• Trained energy analysts, scientists, and green
energy experts of NREL on databases, NoSQL (Not
Only SQL) databases and advantages of both
• Completed SOW (Statement Of Work) for energy
vendors to do RFPs (Request for Proposals) for
Time Series databases with real time data.

4. Energy Sector Clients
• Siemens USA, Colorado, USA. Worked
with the director, and team on reports
customization, and conversion of legacy
code.
• National Renewable Energy Laboratory –
NREL, Colorado, USA. NREL is a national
lab under the Department of Energy
(DOE) whose focus is in renewable energy
and research in energy consumption.