+12 34 56 78
Practical solutions to global problems
From improving citizen-state relations in Pakistan to developing  systemic pro-poor growth in Nigeria to unlocking infrastructure finance in the Balkans, we work with global governments and other partners to tackle complex development projects and to deliver results that create positive change in people’s lives.

Our implementation teams specialise in designing and delivering projects in the areas of governance, security and justice, economic growth and infrastructure. Our in-house evaluation and research experts measure the effectiveness of development aid throughout the world and equip organisations and our programmes with high quality, tailored monitoring and evaluation systems. 


From our European offices in the UK, Poland and the Netherlands, we oversee more than 120 currently live projects in 52 countries. Working with our regional offices and wide base of local partners, we develop solutions that are appropriate, effective and sustainable for local contexts. 

We drive large, complex, global projects

We deliver some of our clients’ largest projects in our service areas. We work with our extensive client and partner networks to design and deliver effective programmes and develop the human and technical infrastructure for project implementation at the highest levels.  

projects currently managed

We build solutions in challenging places

We deploy hundreds of people to many of the world’s most challenging countries and regions. Our duty of care has built a committed safety culture. We ensure all employees and partners operate safely and constantly review and improve our safety behaviour and processes. Our systems are tailored to environment, threat, and task. We examine each project’s specific challenges and provide customised mitigation measures that facilitate delivery while effectively and efficiently minimising the risk to our people.

We deliver for people and countries

We accomplish our clients’ aims while creating real human impact, through safer communities, business opportunities and efficient public services. We maximise the impact of each pound spent. Value for money is built into all our work, through cost reduction measures, local capacity building and results-based approaches. We regularly benchmark our fee rates to keep in line with the market and to provide our clients with the best project teams at the most competitive rates. 

We are experienced, informed & international

Our people think ahead – looking at how the work of today builds into the programming of tomorrow – and we work with clients and partners to deliver strong and effective programmes. Our project managers and business development specialists in London and Warsaw provide industry-leading planning and oversight. Our project delivery teams around the world offer both the technical knowledge and the nuanced diplomacy needed to succeed in each political and cultural context.

  • Text Hover
In 2020, Coffey and WYG’s International Development businesses are coming together under the Tetra Tech International Development identity. 

We’re part of a leading, global consulting firm, Tetra Tech Inc, that provides practical and sustainable international development services, empowering local communities and leveraging private investment to create a safer, more prosperous world for all.

Since Coffey was acquired by Tetra Tech in 2016 – and WYG was acquired in 2019 – we’ve been working together more and more and increasingly collaborating with different parts of the Tetra Tech group of companies across the globe.

While our teams remain the same, we’re seeing the benefits of being part of a larger organisation – we have access to a wider range of expertise and are supported by Tetra Tech’s greater financial strength. Unifying under our new brand is a natural next step to take. 

Read more about our transition from Ben Ward, our Managing Director.

“GEMS4 has inspired me because it has shown me various opportunities to move forward. It has exposed me to businesses that I can also get into, including micro retailing opportunities”


Ummulkhair Sura, participant in the LGA Dissemination event in Kano

  • Learn more