HR Companies & HR Consultants in Vienna, VA

Overview

Arc Human Capital, LLC is a consulting firm based in Vienna, Virginia. It gives small and mid-sized employers in Northern Virginia and the Washington, DC region outsourced human resources support and strategic advice. Its clients include startups, expanding companies and established organizations that want to protect their past success.

The firm presents itself as a long-term partner rather than a short-term independent consultant. It notes that it reached ten years in business in February 2025 and came through the pandemic intact.

The firm offers two kinds of engagement. Advisory work helps leaders make sound decisions about workforce structure, planning and talent. Outsourced support takes over routine administrative HR tasks. Many clients use both, bringing the team in for a single project or keeping it on as an ongoing extension of their own staff. Work usually starts with a conversation to find the organization's most pressing priorities and possible solutions.

Services

Arc Human Capital covers most of the HR lifecycle. Its main practice areas include:

• Compliance: handbooks written together with clients, standalone policies, affirmative action plans, help with EEO-1 and VETS-4212 reports, and audits of pay practices and record retention, including pay transparency checks
• Benefits administration: open enrollment coordination with brokers, enrolling new hires, answering employee questions, handling deductions during leave, and COBRA steps for departing staff
• Employee relations: engagement surveys, recognition programs, communication plans and team assessments using Myers-Briggs, DISC and HBDI
• HR operations: hiring and mentoring HR staff, choosing vendors and HRIS platforms, and rolling out performance management
• HR Mentoring program: access to a senior HR professional, as needed, who coaches in-house teams
• Investigations: confidential workplace inquiries handled from planning through interviews to the final report
• Strategy, M&A and payroll: CEO consultations, SWOT analyses, workforce and succession planning, due diligence and integration after a deal, and payroll support provided through a partner model
• Recruiting and training: talent acquisition strategy, employer positioning, leadership and management training, onboarding, curriculum design and train-the-trainer programs

The firm also handles layoffs, individual terminations and outplacement. It helps founders set up HR for new businesses and advises on corporate social responsibility and volunteer programs. For foreign companies expanding into the United States, it explains what American workers expect in pay and how employment law differs from state to state. Partner firms can translate compliance and benefits materials and provide interpreters.

Team and Credentials

Founder and Principal Consultant Adam Calli holds an MSM and the SHRM-SCP credential. The team also includes Principal Consultant Karen Puleo and Principal Talent Acquisition Advisor Rob Lockard, whose certifications include ACIR, CDSP, CTR, CMVR and SHRM-SCP. Senior Consultants Cecelia Harris (CPC, CEIC) and Doreen Rushton (SPHR, SHRM-SCP), HR Generalist Nicole Leonard and Administrative Assistant Carolyn Theis complete the staff.

Every employee passes a thorough background check when hired, which the firm does to protect the client data and systems its staff can reach.

For buyers, the firm offers senior consultants with recognized credentials and a wide range of services that can replace or add to an internal HR department. It works collaboratively: consultants lay out options and trade-offs, and clients make the final decisions on their policies. The team page also lists staff pets with playful job titles, which suggests a relaxed, approachable culture.