Senior HR Director - Union & Labor Relations

SMS Holdings Corporation seeks a senior HR leader to oversee HR strategy, employee relations, and culture for the MBTA account, guiding a workforce of around 400 across union and non-union populations. This high-impact, hands-on role partners closely with operations to ensure staffing stability, compliance, and strong recruiting results in a fast‑paced service environment. The position reports to operations leadership and collaborates with Talent Acquisition to maintain staffing levels while