Assistant Manager

Company Overview: 

Tetra Tech is a leading provider of consulting and engineering services worldwide. It supports government and commercial clients with innovative solutions focused on international development, climate mitigation and adaptation, environmental sustainability, biodiversity, conservation, land reform, infrastructure, urban development, transport, water, and resource management. With 30,000 associates worldwide in over 120 countries, Tetra Tech's capabilities span the entire project cycle.

Tetra Tech International Development Europe is Tetra Tech's European business unit focused on International Development. We are based in London with offices in Kenya, Nigeria, Poland, and the Netherlands. We deliver international development programmes focused on economic growth, governance and justice/security, and infrastructure, for clients such as the UK's Foreign, Commonwealth and Development Office (FCDO), the United Nations, the European Union, the European Investment Bank and other donors and funding agencies. We also have a strong in-house Monitoring, Evaluation, Research and Learning Practice consisting of 35 evaluators, statisticians, economists, social scientists, and research managers.

Our Values:

We are committed to maintaining business practices that honour and protect the dignity and integrity of everyone with whom the company conducts business, employs, and serves. As a leading international development organisation, we fully support continued progress and improvement within the development community to make development initiatives more effective. We are also committed to addressing various cross-cutting issues relevant to international development to ensure that all people can access and enjoy the benefits of our activities.

• We value our people: we support the development of our people, ensuring that the environments in which they work are fair, safe, and flexible.
• We deliver quality results: we go the extra mile to deliver value for our clients, impact for beneficiaries and a fair financial return for the company to grow sustainably.
• We collaborate effectively: we work authentically with our clients, beneficiaries and partners and strive to always communicate clearly and openly.
• We encourage creativity and innovation: we encourage entrepreneurial thinking and provide the freedom, support and investment for new ideas and initiatives.
• We operate with integrity: We will do the right thing, be honest and keep to our commitments.

Location: London, Near Kings Cross Station / Coal Drops Yard 

Flexible working available: We operate a hybrid working policy, with people working from the office two days a week and the rest working from home. People may choose to come in more often.

Contract Type: Initially a 6- month fixed-term contract with the ambition to make permanent. 

Working Hours: Monday to Friday, 37.50 hours per week, flexible hybrid working office & home with some overseas project travel. Travel to Nigeria is expected.

Salary & Benefits: Competitive Salary & Benefits

Job Overview

Tetra Tech International Development is now offering a fantastic opportunity for someone with a minimum of two years' experience in similar positions/sectors to join its Governance, Security and Justice Team as an Assistant Manager. The role requires working on a large peace-building programme in Nigeria, managing a set of smaller projects and contributing to the work of the larger programme delivery team. You will also be expected to support business development activities and competitive bidding.

Main Duties:

• Managing small projects/workstreams, or contributing to the management of larger projects, and successful delivery of projects overseas, with responsibility for ensuring programme and milestone delivery; financial forecasting and budget management; contractor engagement and technical and financial reporting in line with contract requirements.

• Contributing to business development opportunities, including the successful development of both pursuits and full tenders as part of pursuit/bid teams.

• Undertaking technical advisory work on a short-term basis to support project implementation as needed.

• Developing and maintaining strong networks and relationships with clients, partners, and consultants, and assisting in the development of other team members.

Aptitude and skills:

• Previous demonstrable experience in managing, or supporting the management of, international development projects in similar positions/ technical areas (such as governance, public financial management, economic reform, conflict mitigation and stabilisation or security and justice sector development), preferably with an international development consultancy, in government or with an international NGO, is essential.

• Excellent communication skills in English (both oral and written) and be comfortable working in a multinational, multicultural environment. Knowledge of other languages, particularly French or Arabic, would be an asset. 

• Highly numerate with experience in forecasting, budget and financial management, and proficient in Excel.

• Analytical and have the ability to think logically and problem solve individually or as part of a team.

• Well organised and have a high level of attention to detail.

• Tenacious and resilient, and able to cope well with change and uncertainty.

• A 'team-player' able to build strong team relationships at all levels. You will also be proactive, self-motivated, demonstrate a high level of initiative and be able to thrive in a fast-moving programme and team environment.

• Entrepreneurial and motivated to identify new opportunities for GSJ.

• A willingness to travel to other permanent offices of the business and project locations, including fragile and conflict-affected states, as required.

Qualifications:

Degree level educated, preferably with a Master's in a relevant subject (e.g. international development, international relations, economics, politics, history, war studies, conflict/security or equivalent).

The closing date for applications is 12 December 2025, at midday. 

"Applicants must already have the legal right to work in the UK; we are not able to provide visa sponsorship for this position."

Equality, Diversity, and Inclusion:

Tetra Tech prides itself on a workplace culture that advances equality, diversity, and inclusion and ensures the workplace is free from discrimination, harassment, bullying, racism, and hate speech of any form, regardless of age, disability, sex, gender reassignment, sexual orientation, pregnancy and maternity, race, religion or belief, marriage, and civil partnerships. We encourage applicants from diverse backgrounds to apply for this role.

Disability Confident Employer:

Disability Confident is a UK government scheme that supports employers in creating and fostering diverse and inclusive workplaces. We have self-identified as registered disability confident participants.

Request An Accessible Format: 

If you use assistive technology (such as a screen reader) and need a vision of this document in a more accessible format. Please contact a member of the Human Resources department in the UK by emailing

Safeguarding:  

Tetra Tech International Development has robust policies and guidelines which exemplify our commitment to safeguarding and technical excellence in gender equality. Our team of dedicated GEDSI advisers work closely with our staff and partners to ensure a context-specific and consistent approach is applied to all of our programmes to improve the livelihoods of the world's most marginalised groups.

Region: United Kingdom and Europe Teams and Clients

Role Category: Headquarters Positions or Project Opportunities