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International Development

A group of people observing a man in traditional attire as he plants seeds in the ground. The man is wearing a white robe and a patterned cap, and he is bending down to place seeds in a prepared area of soil. Others in the background are watching attentively.

Our international development services support the world’s major development donors to pursue clear solutions to some of the most pressing global challenges.

We are trusted by partners across the European international development community to design and implement complex multi-year programmes across governance and institutional strengthening, sustainable economic development and infrastructure. ​Our strength in delivering large-scale, multi-country complex programmes and facilities, and our history of delivering in fragile and conflict affected states, are recognised across our industry.

Our monitoring, evaluation, research and learning team is one of the largest in Europe. We implement some of the largest independent evaluations in the UK international development sector and carry out evaluations for the EU across a broad range of areas and disciplines.

Our bespoke solutions span the whole project lifecycle – from design to delivery through to evaluation – delivered with a commitment to inclusive, climate-informed and technologically advanced ways of working. Our services include project management; programme design & implementation; technical assistance facilities; fund management; monitoring and evaluation; research and learning; and third-party monitoring.

Visit our international development website to learn more.

Connect with us. Reach out to our experts.

Our featured SECTOR highlights

We’re going to the European PFAS & Emerging Contaminants Summit, 25–26 March 2026

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Oli Hay and his Apprentice Journey at Tetra Tech

Blue event banner with "Equipping Defence. Enabling Readiness." headline, DPRTE 2026 badge, Tetra Tech and partner logos, Farnborough dates 25–26 March, and "Find us at Stand 72.

Tetra Tech at DPRTE 2026 – Join us on 25–26 March

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