Theo Ramachandran Principal Systems Engineer
Rochester, NY • theo.ramachandran@gmail.com • +1 585-555-0134
Profile Summary
- Principal Systems Engineer with 14 years of experience engineering tactical radio systems across defense communications and commercial avionics, focused on requirements, MBSE and verification for Army and Marine Corps customers.
- Hands-on with requirements tools (DOORS, Jama Connect), MBSE (SysML, Cameo Systems Modeler), simulation (MATLAB, Simulink), test automation (LabVIEW, TestStand) and standards such as ISO 15288 and MIL-STD-882E.
- Deep experience in requirements decomposition, SysML architecture models, ICD control and HIL integration campaigns, using model-based design reviews and quantified trade studies to deliver radios that clear qualification on the first attempt.
- Works daily with hardware, software, RF, test and program teams in a gated V-model lifecycle with customer design reviews, from SRR and PDR through TRR, qualification and field test.
- Mentors junior systems engineers on requirements writing and SysML modeling, chairs the interface control working group, and wrote the program’s trade study template.
Technical Skills
- Requirements & ALM Tools:
- DOORS, Jama Connect, DOORS Next, Polarion ALM, ReqIF, Jira, Confluence
- MBSE & Modeling Tools:
- SysML, Cameo Systems Modeler, IBM Rhapsody, Capella, Enterprise Architect, SysML v2
- Simulation & Analysis:
- MATLAB, Simulink, Stateflow, Python, Ansys STK, Excel
- Integration & Test Tools:
- Hardware-in-the-loop, LabVIEW, TestStand, Keysight signal analyzers, Wireshark, Jenkins
- Interfaces & Data Buses:
- MIL-STD-1553, Ethernet, RS-422, RS-485, CAN bus, ARINC 429
- Safety & Reliability Methods:
- FMEA, FMECA, Fault tree analysis, Hazard analysis, Reliability block diagrams, MTBF prediction
- Standards & Lifecycle:
- INCOSE, ISO 15288, V-model, MIL-STD-882E, MIL-STD-810H, DO-178C, ARP4754A
Education
Work Experience
- Owned the DOORS requirements baseline for a manpack radio upgrade, decomposing 1,900 customer and system requirements into derived subsystem requirements with two-way links, and cut open TBD and TBR items from 140 to 0 before CDR.
- Built the SysML architecture model in Cameo Systems Modeler for 11 subsystems, allocating every function to hardware, software or firmware and generating the ICD tables from the model, which cut architecture rework at PDR from 6 change cycles to 2.
- Ran 7 trade studies on waveform processors, batteries and antennas with weighted Pugh matrices and MATLAB link budget models, and held 18% size, weight and power margin at CDR against a 10% target.
- Chaired the interface working group for 34 ICDs across the radio, its vehicle amplifier and 3 supplier subsystems over MIL-STD-1553 and Ethernet, cutting interface defects found at integration from 12 to 1 per build.
- Led integration of 9 subsystems on hardware-in-the-loop benches with a phased build-up plan and a daily anomaly board in Jira, bringing the average time to close an integration anomaly from 11 days to 4 days.
- Wrote the V&V plan and the verification cross-reference matrix for 2,300 requirements, then automated test procedures in LabVIEW and TestStand, shortening the qualification test campaign from 26 weeks to 17 weeks.
- Led the FMECA and fault tree analysis for the power and RF chains under MIL-STD-882E, which drove 4 design changes and raised predicted MTBF from 3,100 hours to 5,400 hours before low-rate production.
- Took the upgrade through SRR, PDR and CDR with the Army program office and ran the CCB for its configuration baselines, closing all 148 CDR action items in 5 weeks with no delta review.
- Wrote the ARP4754A development assurance plan for a flight display system and lined up DO-178C DAL A evidence with the software lead, delivering 64 certification artifacts for the aircraft’s FAA approval.
- Moved the display line from Word specs to SysML models in IBM Rhapsody, cutting design review prep from 6 weeks to 3 weeks across 5 program releases.
- Mentored 6 new systems engineers through their first PDR and CDR, and wrote the requirements writing guide the avionics systems group gives every new hire.