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Declan O'Brien

Journeyman Plumber
Boston, MA, United States

Professional Summary

Results-driven Journeyman Plumber with 7+ years installing and servicing residential and light-commercial systems across Greater Boston. Known for code-clean rough-ins, leak-free commissioning, and clear customer communication on emergency and remodel jobs.

Employment History

Lead Journeyman Plumber
Harborline Mechanical Services · Boston, MA
Jun, 2021 · Present
Lead 2–4 apprentices on multi-unit renovations and new construction; average 12–15 fixtures per unit turnaround. Complete 180+ service calls/year (water heaters, drain clearing, valve replacements) with 98% first-visit fix rate. Cut callback rate 22% by standardizing pressure tests and photo documentation before closeout.
Journeyman Plumber
North End Plumbing Co. · Boston, MA
Mar, 2018 · May, 2021
Installed copper, PEX, and cast-iron systems for brownstone rehabs and restaurant fit-outs. Passed 40+ municipal inspections on first attempt; zero stop-work orders in final 18 months. Mentored 3 apprentices through MA journeyman exam prep.
Apprentice Plumber
Bay State Mechanical · Quincy, MA
Aug, 2015 · Feb, 2018
Supported rough-in and finish work on 60+ residential projects; learned blueprint reading and MA plumbing code. Maintained van inventory; reduced missing-part delays on jobs by organizing weekly restocks.

Education

Plumbing Technology Certificate
Benjamin Franklin Institute of Technology · Boston, MA
2015
Completed hands-on coursework in residential and light-commercial plumbing systems, blueprint reading, Massachusetts plumbing code, and safe installation practices.
Massachusetts Journeyman Plumber License
Commonwealth of Massachusetts · Massachusetts
2018
Massachusetts credential authorizing journeyman plumbing work across residential and light-commercial projects.

Skills

Residential & light commercial plumbing
PEX, copper & cast iron
Water heaters (tank & tankless)
Drain diagnosis
Code compliance (MA)

Courses

OSHA 10 Construction
OSHA Training Institute · Boston, MA
2018
Construction safety fundamentals covering hazard recognition, fall protection, PPE, and jobsite best practices.