Job Title: Junior Project Engineer – Water Treatment (f/m/d) Locations: Madrid or Barcelona, Spain Job Schedule: Full Time Arcadis is the world's leading company delivering sustainable design, engineering, and consultancy solutions for natural and built assets. We are more than 36,000 people, in over 70 countries, dedicated to improving quality of life. Everyone has an important role to play. With the power of many curious minds, together we can solve the world’s most complex challenges and deliver more impact together. Role description Arcadis is seeking a Junior Project Engineer – Water Treatment (f/m/d) to join our Water Treatment Team in Spain (Madrid or Barcelona). While the role will be based in either Madrid or Barcelona (Spain), it will support projects in other European countries (Netherlands, Belgium, and Germany), focusing on the design phase of wastewater treatment plants, drinking water treatment plants, and water transportation and distribution systems. The position will focus on technical design and calculations. It will also involve collaboration with process engineers to support detailed design development, including pump design and other mechanical components. An understanding of water and wastewater treatment processes is highly valuable. Additionally, the role will occasionally provide technical support to the Spain-based environmental consultancy team focused on industrial clients. The onboarding process will take place in the supported country (Netherlands, Belgium, Germany) for approximately 1–3 months. After this initial period, travel will be occasional. This role offers a unique opportunity for a motivated professional to grow within the world’s leading design & consultancy firm for natural and built assets. As part of our expanding Iberian team you will work with multinational clients on technically challenging, high‑impact projects, benefiting from strong local support from experienced specialists and access to a general network of top‑tier Water Treatment experts. At Arcadis you’ll join a collaborative environment that values technical excellence, knowledge‑sharing, and continuous professional development. We reward outstanding performance with clear career progression, long‑term relationship building, and ongoing support to help you reach your full potential while contributing to innovation and sustainability. Role Accountabilities Support the design and optimization of wastewater treatment plants, with an emphasis on sustainability and reliability. Assist in developing innovative solutions for treating persistent substances, recovering resources and energy, and improving process sustainability. Collaborate with colleagues across civil engineering, process automation, and environmental technology to deliver multidisciplinary projects. Contribute to project coordination by helping prepare action plans and draft proposals. Help prepare and plan renovations or expansions for wastewater treatment plants serving public and industrial clients. Participate in feasibility studies and support technical design for both national and international customers. Qualifications & Experience Bachelor’s degree in Mechanical, Electrical, or Industrial Engineering (or a related discipline). Some experience or strong interest in water and wastewater treatment project design and optimization. Basic understanding of water and residual flow treatment processes (willingness to learn further). Able to follow guidance from senior team members and the Netherlands-based team, while gradually developing independent working skills. Fluent in English and Spanish;
knowledge of Dutch, German, or Catalan is a plus. Eager to learn, with a result‑oriented, customer‑focused, and innovative attitude. Strong teamwork, problem‑solving, and communication skills, with attention to detail and quality. 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📌 Junior Project Engineer – Water Treatment (F/M/D) (Barcelona)
🏢 Arcadis
📍 Barcelona