HR Team Reinforcement · Transformations · Restructuring · Mobile across France

Employee relations,
a driver of competitiveness
for the company.

I am Sonia Hernandez, Interim HR Director specialised in employee relations and high-impact projects, founder of Hernandez Conseil RH.

A core conviction: employee relations are a powerful driver of competitiveness. Constructive social dialogue reduces expert and litigation costs, prevents bottlenecks in project rollout, and frees up the strategic time needed for the company's growth. Employee relations can also secure a competitive edge — such as signing a collective agreement, for instance on night work, that competitors do not have.

Sonia Hernandez, Interim HR Director

A legal, human and strategic reading of transformations
— in service of corporate competitiveness.

« Anticipate human and technological shifts, secure the legal and social framework, lead negotiations — so that transformation happens without breaking what creates the company's value. »

  • Nearly 20 years supporting executives through the critical phases of corporate life — restructurings, capital transformations, site closures, sensitive employee relations.
  • Direct relationship with executive committees, trade unions and operational teams.
  • Interface with all stakeholders — labour inspectorate, occupational health and external advisors.
  • An operational stance combining strategic vision and on-the-ground execution.

Mastered domains, applied in the field.

01 · HR Strategy

The HR function serving business growth

  • HR policies aligned with corporate strategy and capital phases (growth, LBO, joint ventures, carve-outs)
  • Employer branding, workforce planning (GEPP), skills mapping
  • Diversity, inclusion and talent retention policies
  • HR levers serving commercial performance and competitiveness
02 · Restructuring

Collective redundancy plans and reorganisations

  • Strategy definition, preparation, negotiation and operational rollout
  • From single-site to Group-wide perimeter
  • High-visibility media and political contexts
  • Communication with affected managers and employees
03 · Employee Relations

Social dialogue and collective bargaining

  • Designing the HR and employee relations strategy in line with the company's objectives
  • Chairing of works councils (CSE and CSSCT)
  • Collective bargaining (annual wage negotiations, gender equality, workforce planning, etc.)
  • Preparation of staff representative elections
  • Redefining the union landscape
04 · Daily HR

Operational reinforcement of HR teams

  • Temporary replacement of an absent HR Director (maternity leave, extended absence, transition)
  • Ad hoc reinforcement of existing HR teams
  • Specialised expertise input (labour law, employee representation, negotiation)
  • Handling activity peaks
05 · Transformation

Carve-outs, integration, joint ventures

  • Employee transfers and harmonisation of employment terms
  • Redefining the scope of employee representation bodies
  • Aligning the target organisation with Group strategy
  • Steering divestiture and integration operations
06 · Labour Law

Legal advice to executives

  • Securing individual and collective decisions
  • Sensitive cases: protected employees, underperformance (PIP)
  • Workplace accidents and occupational illnesses
  • Liaison with legal departments and labour inspectorate

Demanding contexts, tangible results.

Led a selection of engagements carried out as interim or permanent HR Director with French and international groups in a variety of industries such as IT services, chemicals, biotechnology, industry, logistics, insurance.

2025 — 2026 Tata Consultancy Services (TCS)
2025 Chemours
2025 Galapagos
2024 Gutenberg Networks
2023 — 2024 Microsoft France
2019 — 2022 Albelli Photobox
2011 — 2016 DHL International Express
2008 — 2011 Maaf · Kiabi · Dalkia · EDF
20+
years of experience supporting the strategic and social development of companies
9
international
groups served
complex
restructurings
specialist in high-visibility plans, from single site to Group level

Education and professional trajectory.

Education

Executive education · in progress

Executive MBA — Strategic Management & Economic Intelligence

École de Guerre Économique · Paris

France's leading executive programme at the intersection of strategic management and economic intelligence, designed for senior executives operating in complex and competitive environments.

Applied to the HR Director role, this MBA provides decisive tools to analyse power dynamics in collective bargaining, anticipate the media and political risks of a restructuring, lead crisis communication and deploy influence strategies in driving workforce transformations.

Master 2 — Labour Law
Toulouse Faculty of Law · 2006
International asset

Fluent English

Daily practice in multicultural environments

Worked with British, American, Dutch, Indian and Belgian groups: interfacing with overseas headquarters — mindful of cultural differences.

Career

Interim Director of Employee Relations
Tata Consultancy Services · 2025–2026
Interim HR Director
Chemours · 2025
Interim HR Director
Galapagos · 2025
Interim HR Director
Gutenberg Networks · 2024
Interim HR Director
Microsoft France · 2023–2024
HR Director
Albelli — Photobox Group · 2019–2022
Director of Employee Relations
Photobox Group · 2016–2019
Legal & Employee Relations Manager
DHL International Express · 2011–2016
Employee Relations Manager / Labour Law Counsel
Maaf Assurances, Kiabi Logistique, Dalkia & EDF · 2008–2011

Your questions on interim HR management.

What is an Interim HR Director?

An Interim HR Director is an experienced human resources director who steps into a company for a temporary engagement of defined duration.

External to the organisation, they advise the company's leadership, negotiate collective agreements, attend Works Council (CSE) meetings and may pilot the HR teams day-to-day.

The value added: immediately operational expertise, a neutral perspective free from internal political dynamics, and an engagement focused on precise objectives within a defined timeframe.

What is the difference between an Interim HR Director, cover interim and HR consulting?

Three complementary approaches:

  • Interim HR Director: takes operational leadership of the HR function to drive a transformation (restructuring, collective redundancy plan, carve-out, integration) or to ensure continuity of a vacant role. Advises, negotiates and executes.
  • Cover interim (management relais): a category of interim management dedicated to the temporary replacement of an absent HR Director (maternity leave, extended absence, role transition). The aim is continuity, not transformation.
  • HR consulting firm: delivers a diagnosis and recommendations without engaging in execution. The company then applies the recommendations.

An Interim HR Director can step into either of the first two configurations depending on the context of the engagement.

When should you call on an Interim HR Director?

The main contexts:

  • Restructurings and collective redundancy plans (PSE): strategy definition, preparation, negotiation, operational rollout;
  • Capital operations: carve-out, post-merger integration, joint venture, LBO, site closure;
  • Sensitive negotiation: complex annual mandatory negotiations (NAO), workforce planning agreement (GEPP), collective litigation, strained social dialogue;
  • Operational reinforcement: activity peak, strategic HR project (HRIS, HR policy redesign), crisis management;
  • Temporary cover (cover interim): maternity leave, extended absence, transition between two incumbent HR Directors.
What is the typical duration of an engagement?

According to the France Transition H2 2025 barometer (industry federation), an interim management engagement lasts on average 7.5 months. Most engagements fall between 5 and 12 months.

Targeted urgency contexts can run from a few weeks to 3 months; conversely, a complex restructuring or a long cover may extend up to 18 months. The duration is set in the initial contract and may be adjusted as the project evolves.

How much does an Interim HR Director engagement cost?

Billing is based on a Daily Rate (TJM — Tarif Journalier Moyen) negotiated at the outset, depending on the complexity of the subject, the duration and the scope.

A direct engagement, with no intermediary, allows for a competitive daily rate without the commission of an Interim Management Firm.

The total cost remains lower than that of a permanent hire over the same period.

How quickly can an engagement start?

Very quickly. Following an initial scoping conversation and the signature of the service agreement, the engagement typically starts between 48 hours and 2 weeks.

This responsiveness is one of the key advantages of interim management over a traditional hire (which takes 3 to 6 months). An immersion phase of 10 to 15 days — meetings with the Executive Committee, employee representative bodies (IRP), HR teams and external advisors — enables a swift entry into operations.

How does an engagement unfold?

The engagement is structured in four stages:

  1. Scoping: initial conversation to understand context, objectives and constraints (scope, duration, deliverables, daily rate); signature of the service agreement.
  2. Immersion and diagnostic: first days dedicated to meetings with the Executive Committee, employee representative bodies (IRP), HR teams and external advisors, and to the state-of-play assessment.
  3. Operational delivery: execution of the plan agreed with leadership, negotiations, advisory to the leadership, decision-making, regular reporting to the Executive Committee.
  4. Closure and handover: knowledge transfer to the successor (incumbent or newly recruited HR Director), end-of-engagement review.

A transformation project,
a sensitive negotiation to lead,
in need of reinforcement?

Let's discuss your context, your timeline and the engagement you have in mind — no commitment.

Or write directly.