14 Best Practices for Working With Interim Employees

How we chose these best practices for interim employee collaboration

Working with interim employees brings specific challenges that require targeted solutions. We developed these 15 best practices based on decades of experience matching organizations with interim talent across the Netherlands and EMEA region.

• Onboarding efficiency: Practices that help you get interim employees productive quickly, reducing your time-to-contribution
• Communication clarity: Methods that prevent misunderstandings and keep projects on track from start to finish
• Compliance focus: Approaches that ensure you meet legal and contractual requirements when engaging external talent
• Knowledge retention: Strategies that help your organization capture insights and expertise before interim employees move on
• Team integration: Techniques that help interim staff feel connected while respecting their external role
• Scalability: Practices that work whether you engage one interim employee or manage a flexible workforce of many

The 14 best practices for working with interim employees

1. Set clear role expectations from day one

Ambiguity kills productivity. When you engage an interim employee, document their specific responsibilities, deliverables, and reporting lines before they start. This clarity helps the interim professional understand exactly what you need from them.

HeadFirst recommends creating a role brief that covers daily tasks, project milestones, and decision-making authority. Include information about who the interim employee reports to and who can assign them work. This prevents confusion and overlapping requests from multiple stakeholders.

A written brief also protects your organization. If questions arise about scope or performance, you have documentation to reference. This becomes especially important when managing multiple interim employees across different departments.

HeadFirst approach to role clarity

• Role brief templates: Standardized documents ensure you capture all essential information consistently across engagements
• Scope boundaries: Clear definitions of what falls inside and outside the interim employee's responsibilities
• Reporting structure: Visual charts showing who the interim professional works with and reports to
• Deliverable definitions: Specific, measurable outcomes tied to project timelines and milestones
• Decision rights: Explicit guidance on what the interim employee can decide independently versus escalate

Role clarity pros and cons

Pros:

• Reduces confusion and rework during the engagement
• Creates accountability for both parties
• Speeds up onboarding by answering common questions upfront

Cons:

• Requires time investment before the interim employee starts
• May need updates if project scope evolves
• Balancing detail with flexibility takes practice

2. Create a structured onboarding process

Interim employees often receive minimal onboarding compared to permanent staff. This approach backfires. Research from the Society for Human Resource Management (SHRM) shows that structured onboarding improves retention and time-to-productivity across all employee types.

Build a condensed onboarding checklist specifically for interim staff. Include system access, key contact introductions, and essential process documentation. HeadFirst makes onboarding interim employees simpler by ensuring professionals arrive prepared with compliance documentation already complete.

3. Assign a dedicated point of contact

Interim employees should never wonder who to ask for help. Assign a single point of contact who can answer questions, clarify priorities, and resolve blockers. This person does not need to be the interim employee's direct manager - a team member or project coordinator works well.

The point of contact bridges the gap between the interim professional and your organization. They help navigate internal processes that permanent employees take for granted, like requesting equipment or finding meeting rooms.

4. Share essential documentation upfront

Information hoarding slows everyone down. Before the interim employee's first day, prepare access to relevant systems, process documents, and project files. Think about what a permanent employee in the same role would need and make sure the interim professional has equivalent access.

HeadFirst supports this by ensuring contracts and compliance documentation move quickly, so you can focus on operational onboarding rather than administrative tasks.

5. Establish communication protocols

Miscommunication costs time and money. Define how, when, and how often you expect communication. Will you use email, Slack, Teams, or another platform? How quickly should the interim employee respond to messages? When should they escalate issues versus solve them independently?

Document these expectations in writing. What feels obvious to permanent staff may confuse someone new to your organization's culture and norms.

6. Include interim staff in team meetings

Excluding interim employees from team meetings creates information gaps. Include them in relevant standups, planning sessions, and project reviews. This integration helps them understand context, build relationships, and contribute meaningfully.

Be selective about which meetings add value. Interim professionals do not need to attend every all-hands or social event, but they should participate in meetings where their work is discussed or where they need information to do their job well.

7. Define success metrics early

Vague expectations lead to disappointment. Work with the interim employee during their first week to define specific, measurable success criteria. What does a successful engagement look like? What outputs should they deliver? By when?

HeadFirst clients often link interim performance metrics to project milestones. This gives both parties clear checkpoints to review progress and adjust when needed.

8. Schedule regular check-ins

Weekly 15-minute check-ins prevent small issues from becoming large problems. Use this time to discuss progress, remove obstacles, and adjust priorities. Keep a running document of discussion points so nothing falls through the cracks.

For shorter engagements, daily touchpoints may work better. The frequency matters less than consistency. Regular check-ins signal that you value the interim employee's contribution and want them to succeed.

9. Respect contractual boundaries

Interim employees and freelancers operate under different legal frameworks than permanent staff. Understand and respect these boundaries. Avoid treating interim professionals as employees in terms of direction and control if their contract specifies otherwise.

HeadFirst helps organizations maintain compliance with Dutch and European regulations governing external workers. This includes ensuring proper contract structures and avoiding arrangements that could create legal risk.

10. Foster a sense of belonging

People perform better when they feel connected to their team. Small gestures matter—introductions, lunch invitations, and inclusion in team celebrations help interim employees feel welcome. This does not mean blurring the line between permanent and temporary staff, but rather treating all team members with respect.

A sense of belonging improves collaboration quality and encourages interim employees to go beyond minimum requirements when the situation calls for it.

11. Document processes and decisions

Knowledge walks out the door when interim employees leave. Combat this by documenting processes, decisions, and lessons learned throughout the engagement. Assign responsibility for documentation to both the interim professional and their permanent counterparts.

Use shared folders, wikis, or project management tools to capture this information in accessible locations. HeadFirst clients who prioritize documentation find they onboard future interim employees faster and maintain continuity between engagements.

12. Give constructive feedback

Interim employees deserve the same quality feedback as permanent staff. Do not save feedback for the end of the engagement when it is too late to adjust. Offer timely, specific observations about what is working well and what could improve.

Frame feedback around outcomes rather than personality. Focus on specific behaviors and their impact on the project or team.

13. Plan for knowledge transfer

Every interim engagement should include dedicated time for handover. Build knowledge transfer into the project timeline rather than treating it as an afterthought. Schedule sessions in the final week for the interim employee to brief permanent staff on their work.

Document key decisions, processes created, and contacts established during the engagement. This investment pays dividends when the next project begins or when questions arise after the interim professional has moved on.

14. Evaluate and learn after each engagement

After the interim employee completes their work, take time to reflect. What went well? What could have gone better? Would you work with this person again? Feed these insights back into your processes for future engagements.

HeadFirst collects satisfaction data from both clients and interim professionals after each engagement. This feedback loop helps improve matching quality and refine best practices over time.

How do you onboard interim employees quickly and effectively?

Speed and thoroughness do not have to conflict. Effective interim onboarding focuses on what the professional needs to start contributing, not everything about your organization.

Create a condensed onboarding package covering system access, key contacts, and immediate project context. HeadFirst clients typically complete interim onboarding in one to two days using standardized checklists and pre-verified compliance documentation.

Assign the onboarding point of contact before the start date. Have logins ready, meetings scheduled, and a clear first-week plan prepared. The interim employee should know exactly what to do when they arrive.

> There are plenty of onboarding tools available for you, take a quick look at our guide to make your onboarding process faster, and smoother!