This role offers the chance to join a high-performing, deeply collaborative Philanthropy Team within ClientEarth’s Development Department, working closely with major donors, trusts, and foundations across multiple countries.
Important dates to note:
* Deadline to submit an initial application: 23 November 2026
* If your profile passes initial screening, you will be asked to submit additional information in the form of three additional questions.
* The deadline to submit your answers/additional information is 26 November 2026
* If we do not receive a response to these questions by the deadline we will assume you are no longer interested in the role.
* Interviews will take place on 4 December 2026.
Please also review the "Our Hiring Process" section at the bottom of this advert to learn more about the stages involved for this specific role.
Application Deadline: November 23, 2026
Department: External Affairs
Employment Type: Permanent - Full Time
Location: Brussels
Address: 60 Rue de Trone (3rd floor), Brussels, Brussels, 1050
Workplace type: Hybrid
Compensation: €3,958.13 / month
Reporting To: Aisling Foster
Key Responsibilities
* Actively manage donor relationships across an assigned portfolio of supporters, within agreed strategy and targets, providing first-class stewardship and reporting to secure renewals and uplifts.
* Develop the pipeline of new donors through effective prospect research, network mapping and connecting with new contacts at external and internal events as a representative of ClientEarth.
* Write and develop public-facing communications materials for donors, consistent with brand guidelines, in coordination with the communications team and programme staff as appropriate.
* Keep up to date with fundraising trends and ensure these are worked into internal activities and planning. Facilitate knowledge sharing within the Philanthropy team and across the Development department.
See the job description for a full list of duties for this role.
Skills, Knowledge & Expertise
* Experience of providing best practice donor stewardship and relationship development with demonstrable evidence of securing or managing five and six figure gifts
* Experience of identifying, cultivating and soliciting prospects
* Ability to write compelling communications materials including fundraising campaigns, donor reports, and proposals
* Experience of raising funds from donors in different geographies
See the job description for a full list of duties for this role.
Note to candidates: We know that long lists of criteria can be daunting and that some candidates will not apply for a role unless they feel they are 100% qualified. If you feel you meet at least some of the essential criteria, we still encourage you to apply.
Job Benefits
Flexible working: We are proud to be a Flexa accredited Employer. Our flexible working policy allows our people the choice to decide to work from home/another location in the country where their contract of employment is issued for 80% of their month, with the other 20% of their month being office-based.
ClientEarth values diversity and inclusion and the benefits this brings. We aim to appoint the most suitable candidate at all times and welcome applications from people from all different backgrounds.
Please note that ClientEarth is only able to employ those who have the pre-existing legal right to work in the UK or Belgium.
ClientEarth is not a law firm and does not provide legal advice or legal services to third parties.
About ClientEarth
We are a non-profit using the power of the law to bring about end-to-end systemic change: informing, implementing and enforcing the law, drafting and advising decision-makers on policy, building legal expertise, and ensuring citizens’ access to the laws that defend them.
We take governments to court – and win. We force polluting industries to shut down. We protect irreplaceable forests and vulnerable species. We empower people and NGOs with the legal rights to bring forward environmental battles of their own. Using the law means that we create real, long-lasting and embedded change.
We’re working to secure a lasting civilisation in which people and nature thrive together. We work in partnership across borders, systems and sectors, ingeniously using the law to protect life on Earth.
Documents: Senior philanthropy officer job description
* Deadline to submit an initial application: 23 November 2026
HOW TO APPLY:
Apply online via the ClientEarth careers portal: https://jobs.clientearth.org/en/postings/d5a4a3fb-96a6-4ec7-92df-c8569b823379/applications/new. Initial application deadline is 23 November 2026. If your profile passes initial screening, you will be asked to submit answers to three additional questions by 26 November 2026. Interviews will take place on 4 December 2026.