Design Assistant Jobs in Spring Hill, FL (NOW HIRING)

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There has never been a better time to be at AECOM. With accelerating infrastructure investment worldwide, our services are in great demand. We invite you to bring your bold ideas and big dreams and become part of a global team of over 50,000 planners, designers, engineers, scientists, digital innovators, program and construction managers and other professionals delivering projects that create a positive and tangible impact around the world.

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AECOM’s Water Division is actively seeking a motivated and collaborative Water Design-Build Project Manager to support the delivery of complex water and wastewater infrastructure projects with a focus in the southeastern United States. This senior role offers the opportunity to work within an integrated design-build environment, contributing to the planning, design, and construction of water and wastewater treatment plants, pump stations, and conveyance systems. The Project Manager will partner closely with engineering, construction, and procurement teams to help deliver high-quality projects that address some of the nation’s most critical water infrastructure needs while advancing AECOM’s leadership in the water market.

This position is well suited for a project manager who thrives in a team-oriented environment, is eager to grow design-build expertise, and enjoys balancing technical, commercial, and delivery responsibilities.

Key Responsibilities

• Support and manage the delivery of design-build water and wastewater projects from early planning through construction completion.
• Coordinate and oversee multi-discipline design teams across AECOM’s design centers to ensure alignment with project scope, schedule, and budget.
• Assist with procurement of process equipment and subcontractors, including participation in bid evaluations and subcontract negotiations.
• Contribute to project scheduling, cost control, and forecasting activities, including job cost reporting and estimates at completion (EAC).
• Participate in constructability reviews, value engineering efforts, and risk management discussions.
• Support design-build pursuits by contributing to proposal development, pricing strategies, and technical approaches.
• Collaborate closely with construction teams during execution to support field coordination, issue resolution, and client communications.
• Maintain strong working relationships with clients, subcontractors, and internal stakeholders to promote successful project outcomes.
• Travel to project sites and other AECOM offices as needed to support project delivery.

Minimum Requirements

• Bachelor’s degree in Civil, Environmental, Sanitary, Chemical Engineering, Construction Management or a related field and 8+ years of relevant experience delivering water or wastewater projects using design-build methods or demonstrated equivalency of experience and/or education.
• Valid driver’s license that allows you to drive during the course of your employment; subject to motor vehicle records review.

Preferred Qualifications

• Experience supporting progressive design-build, lump sum design-build, or CMAR project delivery approaches.
• Desire to participate in organizations such as the Design Build Institute of America (DBIA) or Water Collaborative Delivery Association (WCDA).
• Strong understanding of project delivery fundamentals with the ability to facilitate technical and commercial discussions.
• Proven ability to manage and collaborate with multidisciplinary engineering and construction teams.
• Experience with project cost controls, earned value analysis, and budget forecasting.
• Demonstrated commercial awareness, including subcontract management and construction contract fundamentals.
• Experience managing projects in the $10M+ range.
• DBIA certification preferred but not required.
• Professional Engineer (PE) license preferred.
• Experience working with local and state regulatory agencies.
• Strong written and verbal communication skills with the ability to interface effectively with clients and project partners.

• Short-term travel is expected and generally up to 5-10%, depending on project workload.
• Sponsorship is not available for this position.

At AECOM, we are committed to maintaining a secure and trustworthy recruitment process and take any fraudulent hiring activity seriously. To support this commitment, all newly hired employees are required to attend an in-person Day 1 onboarding at an AECOM office location as a condition of employment.

About AECOM 

AECOM is proud to offer comprehensive benefits to meet the diverse needs of our employees. Depending on your employment status, AECOM benefits may include medical, dental, vision, life, AD&D, disability benefits, paid time off, leaves of absences, voluntary benefits, perks, flexible work options, well-being resources, employee assistance program, business travel insurance, service recognition awards, retirement savings plan, and employee stock purchase plan. 

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 2025. Learn more at aecom.com. 

What makes AECOM a great place to work 

You will be part of a global team that champions your growth and career ambitions. Work on groundbreaking projects - both in your local community and on a global scale - that are transforming our industry and shaping the future. With cutting-edge technology and a network of experts, you’ll have the resources to make a real impact. Our award-winning training and development programs are designed to expand your technical expertise and leadership skills, helping you build the career you’ve always envisioned. Here, you’ll find a welcoming workplace built on respect, collaboration and community—where you have the freedom to grow in a world of opportunity. 

As an Equal Opportunity Employer, we believe in your potential and are here to help you achieve it. All your information will be kept confidential according to EEO guidelines.