Top Architectural & Engineering Services Companies

AECOM is the global infrastructure leader, committed to delivering a better world. As a trusted professional services firm powered by deep technical abilities, we solve our clients’ complex challenges in water, environment, energy, transportation and buildings. Our teams partner with public- and private-sector clients to create innovative, sustainable and resilient solutions throughout the project lifecycle — from advisory, planning, design and engineering to program and construction management. AECOM is a Fortune 500 firm that had revenue of $16.1 billion in fiscal year 2024. Learn more at aecom.com.

We deliver impactful global solutions to create a more connected, sustainable world — from intelligence to infrastructure, cybersecurity to space exploration. Our 52,000 employees across 50 countries work every day, challenging the expectations of today to reinvent the way we’ll all live tomorrow.

For over 75 years, Arup has been recognized for its vision, talent and tenacity. We are an independent firm, owned in trust by our members. We choose work where we can make a positive difference in the world. Dedicated to sustainable development, the firm is a collective of 18,000 designers, advisors and experts working across 140 countries. Founded to be both humane and excellent, we collaborate with our clients and partners using imagination, technology and rigor to shape a better world. Arup’s primary goal is to develop a truly sustainable built environment. This means that in all our work, we aim to identify a balance between the needs of a growing world population and the finite capacity and health of our planet.

About Black & Veatch Black & Veatch is a 100% employee-owned engineering, procurement, consulting, and construction company. We design and build the infrastructure communities rely on every day—from power and water systems to emerging energy and sustainable solutions. For more than a century, we’ve continued to adapt—advancing technologies and improving how we deliver for our clients and communities. That mindset of continuous improvement still shapes how we work today. Our work is grounded in three values: Care, Create, and Own. We lead with safety and respect, turn complex challenges into real-world solutions, and take responsibility for what we deliver. What sets us apart is how connected we are to the work. Across projects and teams, you’ll see solutions move from concept to construction—and the real-world impact they create. If you’re looking for work you can stand behind—and a career that grows through experience—you’ll find it here. Why Join Black & Veatch Work across the full project lifecycle—from concept through construction—contributing to infrastructure that communities rely on every day. Why People Stay Careers grow through hands-on experience, new challenges, and teams that collaborate, share accountability, and follow through together. Why Black & Veatch As a 100% employee-owned company, ownership shows up in how decisions are made and work gets done—creating a real connection between what you build and the outcomes you deliver.

Bechtel helps our customers deliver projects of purpose that create a lasting positive legacy. These are projects that create jobs and grow economies; improve the resiliency of the world's infrastructure; connect communities to resources and opportunity; get us closer to net zero; tackle critical environmental challenges; protect people and the planet; and accelerate progress to make the world a cleaner, greener, safer place. While expertise enables delivery, partnerships ensure long-term success, which is why we align everything we do to our customers’ goals. Since 1898, we have helped customers complete more than 25,000 projects in 160 countries on all seven continents.

From the ground up, Fluor Corporation is one of the world's largest international design, engineering, and contracting firms. The company provides engineering, procurement, construction, maintenance, and project management services for a variety of industrial sectors around the world. Its myriad portfolio includes manufacturing plants, refineries, pharmaceutical facilities, health care buildings, power plants, and telecommunications and transportation infrastructure. Oil and gas, industrial, and infrastructure projects account for more than half of Fluor's sales. The group also provides operations and maintenance services for its projects, as well as administrative and support services to the US government.

Tetra Tech is a leading, global provider of consulting and engineering services. We are differentiated by Leading with Science® to provide innovative technical solutions to our clients. We support global commercial and government clients focused on water, environment, sustainable infrastructure, renewable energy, and international development. With more than 25,000 associates worldwide, Tetra Tech provides clear solutions to complex problems. 

WorleyParsons Corporation puts its energy into energy and chemical plants. The US subsidiary of WorleyParsons Limited, the company is a top designer and builder of modular facilities for refineries and process plants in remote areas and harsh environments. WorleyParsons, whose services also include procurement and project management, targets the hydrocarbons, minerals and metals, infrastructure and environment, and power industries. Offshore work is provided by its INTECSEA arm. The US operations are supported by the WorleyParsons worldwide network. The company's global diversity and client base allow it to advance even in challenging market conditions.

Mott MacDonald is a global engineering, management, and development consulting firm focused on guiding our clients through many of the planet’s most intricate challenges. Our US operation stretches from New York City to Houston to Los Angeles, with more than 2,300 staff working in more than 60 offices. We play key roles in some of today’s landmark engineering projects, including the LA Metro Regional Connector, Block Island Wind Farm, Parallel Thimble Shoal Tunnel, New York Harbor Water Siphon, and many more. However, it’s not all about the big stuff. We also embed ourselves in communities by working on smaller, more localized projects. Sustainability is at the heart of everything we do. Leaving a legacy that we are proud of matters to us. As an employee-owned company, we take a real interest in creating a diverse and inclusive workplace, putting people before profit. Like what you see? Join us and help build a business for all.

Whiting-Turner Contracting provides construction management, general contracting, and design/build services, primarily for large commercial, institutional, and infrastructure projects in the US. A key player in retail construction, the employee-owned company also undertakes such projects as biotech cleanrooms, theme parks, historical restorations, senior living residences, educational facilities, stadiums, and corporate headquarters for such clients as AT&T and General Motors. Whiting-Turner Contracting has some 30 locations throughout the US. G.W.C. Whiting and LeBaron Turner founded the company in 1909 to build sewer lines.