CAREERS

Water Practice Intern: Economic and Financial Research

Location: Washington, DC

Practice: Water Practice

Castalia is seeking candidates for up to two internship positions. The position will be based in Castalia’s Washington, DC office. The interns would be responsible for:

  • Conducting economic and financial research, analysis, and modelling;
  • Producing written and visual outputs to clearly and concisely communicate the results of the analysis and modelling to clients; and
  • Assisting with business development efforts.

The position is full-time or part-time, ideally at least 16 hours per week, onsite. The internship start date is flexible (on or after 26 January, and it can be extended or transitioned to a permanent position.

Who we’re looking for

Castalia is seeking candidates who are currently enrolled in a relevant graduate or undergraduate program (for example, international economics, finance, and policy) and expect to graduate in the next 18 months or have graduated in the last 12 months.

  • Excellent research and analytical skills, and an ability to apply theory to real problems
  • Native-level fluency in English
  • Excellent presentation and communication skills
  • Advanced Excel skills (logical formulas, lookups, pivot tables, etc.)
  • Relevant work experience, for example, in infrastructure, specifically related to public-private partnerships or urban utilities
  • US Work Authorization.

How to apply

If you’re interested in this position, please click the button below to fill out and submit your application form to us.

Only fully completed applications can be submitted. You will need the following information and documents ready.

  • Cover letter and Resume/CV
  • Two professional references
  • Academic Transcripts

Please let us know and we’ll get back to you as soon as we can.

[contact-form-7 id=”2370″ title=”Careers questions”]

How to apply

If you’re interested in this position, please click the button below to fill out and submit your application form to us.

You will need the following information and documents ready.

  • Cover letter and Resume/CV
  • Two professional references
  • Academic Transcripts

Application closing date: 14 November 2025

Internship start date: 26 January 2026

Due to the number of applications we receive, we will only contact shortlisted applicants.

Please let us know and we’ll get back to you as soon as we can.

[contact-form-7 id=”1861″ title=”Careers questions”]

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