Senior Drainage / Hydrology Engineer
About the job
- A Bachelor's Degree in Civil Engineering is mandatory.
- A Master's Degree in Hydrology / Water Resources Engineering is mandatory.
- A minimum of 10+ years of relevant experience is required.
- Proven experience with highway or urban drainage projects is required.
- Proven experience with large infrastructure development is required.
- Proven experience with flood risk and hydrological assessments is required.
- Strong knowledge of hydrology, hydraulics, and drainage engineering principles is required.
- Proficiency in HEC-RAS and HEC-HMS is required.
- Proficiency in SWMM, MIKE, and InfoWorks is required.
- Proficiency in AutoCAD and Civil 3D is required.
- Experience delivering end-to-end drainage design solutions across urban, industrial, highway, airport, seaport, and railway projects is required.
- The candidate must be able to independently plan, model, and optimize stormwater systems from catchment analysis and concept stage through detailed design and GFC deliverables.
- The candidate must have a strong command of hydrologic and hydraulic modeling tools including SWMM, HEC-RAS, HEC-HMS, SewerCAD/Storm CAD, Civil 3D, QGIS, TUFLOW, MIKE, and HY-8.
- Strong analytical and problem-solving skills are required.
- Excellent communication and report writing skills are required.
- Leadership and team management capability is required.
- The ability to manage multiple projects and meet deadlines is required.
- Perform hydrological studies including rainfall-runoff analysis, watershed modeling, and flood estimation.
- Conduct hydraulic analysis for open channels, culverts, stormwater networks, and river systems.
- Develop floodplain maps and assess flood risks using appropriate models.
- Design stormwater drainage systems, including roadside drainage, culverts and cross-drainage works, stormwater pipelines, and retention/detention systems.
- Ensure efficient stormwater management while minimizing flood risks and erosion.
- Prepare model inputs, calibrate models, and interpret results for design optimization.
- Collaborate with civil, structural, environmental, and geotechnical teams.
- Provide technical guidance and mentorship to junior engineers.
- Coordinate with clients, consultants, and government authorities.
- Ensure designs comply with applicable standards, codes, and guidelines, including IRC, MoRTH, local municipal requirements, and international standards.
- Prepare reports, technical specifications, and design documentation for approvals.
- Conduct climate resilience and flood risk assessments.
- Implement sustainable drainage systems and low impact development solutions where applicable.
- Experience with GIS tools such as ArcGIS and QGIS is preferred.
- Experience with international projects or multi-disciplinary teams is preferred.
- Knowledge of climate change impact assessment is preferred.
- Chartered Engineer or Professional Engineer status is preferred.
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
Gym Membership
Professional Development Budget
Conference Attendance Budget
Stock Options
Company Equity
Phone/Internet Stipend
Home Office Stipend
Relocation Assistance
Childcare Support
Meal Benefits
Parental Leave
Family Planning Benefits
Fertility Treatment Support
Company News
Assystem reported consolidated revenue of €328.5 million for the first half of 2026, representing organic growth of 2.5% despite a 1.9% negative currency effect. The French engineering group's nuclear activities drove performance with 8.0% organic growth, accounting for 81% of total revenue. Revenue in France rose 4.2% organically to €201.1 million, led by strong momentum in nuclear new-builds and fuel cycle activities. International operations generated €127.4 million, remaining stable organically despite currency headwinds from the pound sterling, Indian rupee, and Saudi riyal. The UK showed robust growth in civil nuclear engineering and defence. However, business volumes declined in the Middle East, Central Asia region and India due to project endings and slower contract phasing. Assystem confirmed its full-year 2026 targets.
Assystem, an international engineering group, reported first-quarter 2026 consolidated revenue of €165.8 million, representing 2.2% organic growth driven by strong nuclear sector performance of 8.0%. Nuclear activities accounted for 81% of total revenue, up from 76% in the prior year. French operations grew 4.4% to €102.6 million, driven by momentum in fuel cycle activities, new-builds and digitalisation. International revenue declined 7.1% to €63.2 million, primarily due to a 6.0% negative currency effect from the pound sterling, Indian rupee and Saudi riyal. The UK showed robust growth in civil nuclear engineering and defence. Assystem secured key positions on government frameworks and its client Rolls-Royce SMR signed a contract with Great British Energy for three small modular reactors.
A global nuclear engineering firm has strengthened its UK presence with the acquisition of a specialist construction company. Paris-headquartered Assystem has… | North East | Construction | Engineering | International | Energy | Mergers & Acquisitions | Commercial Partnerships | Manufacturing & Construction |
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