Hydraulic Engineer
About the job
- A Bac+5 engineering degree in hydraulics, process engineering, fluid mechanics, or an equivalent field is required.
- At least five years of experience designing complex hydraulic networks is required; experience in the nuclear or industrial sector is ideal.
- Strong skills in steady-state and transient hydraulics are required.
- Knowledge of network equipment, including pumps, piping, valves, heat exchangers, and filtration systems, is required.
- Mastery of hydraulic simulation tools such as Flomaster, Epanet, or equivalent is required.
- Knowledge of nuclear safety requirements and standards applicable to nuclear facilities is required.
- Lead design and sizing studies for cooling-water source networks.
- Perform and verify hydraulic calculations for networks, pumping installations, water intake structures, and cooling circuits.
- Define functional system architectures and their interfaces with other installation systems.
- Participate in designing major equipment, including pumps, piping, valves, filters, heat exchangers, and hydraulic structures.
- Produce and verify engineering documents, including hydraulic calculation notes, operating notes, technical specifications, process flow diagrams and piping and instrumentation diagrams, justification dossiers, and safety and classification notes.
- Conduct transient studies and analyze complex hydraulic phenomena, including water hammer, cavitation, pressure losses, and pumping conditions.
- Contribute to validating hydraulic models and use tools such as Flomaster.
- Coordinate technically with safety, mechanical, civil engineering, electrical, and instrumentation and control disciplines.
- Ensure the technical quality of deliverables and compliance with project milestones.
- Participate in internal and client technical reviews.
- Experience in the nuclear or industrial sector is ideal.
About the company
Assystem provides engineering services for complex projects, covering design, construction, supervision, commissioning, and operation, with a strong focus on the nuclear and energy sectors. Its approach combines multidisciplinary engineering teams and project-management capabilities to move projects from initial concept through to operation. The company differentiates itself through a long track record, strategic acquisitions (including Alphatem in 1995 and Mactech Energy Group in 2025) and an early public offering in 2013, which have expanded its capabilities and market reach in the energy and nuclear fields. Its goal is to be a leading, reliable partner for clients by delivering end-to-end engineering services and helping them meet safety, performance, and regulatory requirements across the project lifecycle.
Company Size
5,001-10,000
Company Stage
IPO
Headquarters
Paris, France
Founded
1966
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Simplify's Take
What believers are saying
- H1 2026 revenue grew 2.5% organically; nuclear grew 8.0%.
- France delivered 4.2% organic growth on new-builds, fuel cycle, and digitalisation.
- UK momentum accelerated after April 2026 SMR, CPS2, and MoD framework wins.
What critics are saying
- Nuclear concentration leaves Assystem exposed if French EPR2 schedules slip beyond 2027.
- H1 2026 international revenue fell from currency hits and project endings in India.
- Rolls-Royce SMR still needs FID, regulatory clearance, and site decisions before revenue scales.
What makes ASSYSTEM unique
- Assystem derived 81% of H1 2026 revenue from nuclear engineering.
- April 2026 UK wins placed Assystem on CPS2 and MoD delivery frameworks.
- January 2025 Mactech Energy Group deepened Assystem's UK nuclear construction capabilities.
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Benefits
- Health Insurance
- Dental Insurance
- Vision Insurance
- Unlimited Paid Time Off
- Flexible Work Hours
- Remote Work Options
- Paid Vacation
- Paid Holidays
- Hybrid Work Options
- 401(k) Retirement Plan
- Wellness Program
- Mental Health Support