Location: Darlington, Co Durham
Contract Type: Permanent / Full Time
Are you an experienced Senior Process Engineer looking to work on cutting-edge liquefied gas projects with a company that values innovation, flexibility, and professional development? We are exclusively recruiting for a permanent Senior Process Engineer on behalf of Whessoe Engineering Ltd, a world-renowned leader in engineering, procurement, and construction (EPC) services, with over 200 years of excellence in the industry, based in Darlington.
Why join Whessoe Engineering?
Whessoe Engineering is a multidisciplinary engineering firm with a strong reputation for delivering complex projects in the hydrocarbon, petrochemical, and energy sectors. As part of the Samsung C&T family, they offer their engineers the opportunity to work on high-profile, global projects, providing world-class solutions in process engineering.
Flexible working: choose between a 40 or 37-hour work week, adjusting your hours around core office times (Mon-Thurs: 10am-3pm, Fri: 9am-1pm) to suit your lifestyle
Hybrid working: after a familiarisation period, employees can work 2 days per week from home
Career development: work on complex, multi-disciplinary projects where you will take the lead on process design, simulation, and safety reviews, gaining invaluable experience in the field
Strong company benefits including 25 days holiday (rising to 28), a holiday purchase scheme, 10% employer pension contributions, free secure parking, life insurance (4x salary), and access to wellbeing initiatives such as regular yoga classes The role – drive engineering excellence in global energy infrastructure
As a Senior Mechanical Tank Engineer, you will play a key role in the mechanical design and analysis of tanks, pressure vessels, and heat exchangers for large-scale oil, gas, and LNG projects.
Based in Darlington, with opportunities to travel to UK and international sites, you will lead design activities, supervise engineering teams, and contribute to major infrastructure programmes across the energy sector.
Key responsibilities:
Deliver mechanical design of ambient and cryogenic storage tanks, pressure vessels, and heat exchangers
Conduct engineering calculations, stress assessments, and finite element analysis (ANSYS, STAAD, Caesar II)
Prepare and check technical documents including design reports, specifications, and datasheets
Apply design codes such as API 620/650, ASME VIII, and Eurocodes
Lead and mentor other engineers and interface with design draughting teams
Support tender development, including labour-hour estimation and technical input
Ensure compliance with client requirements, project schedules, and internal quality procedures What we’re looking for:
Degree-qualified in Mechanical Engineering (BEng or MEng)
Chartered Engineer status (or working towards) is desirable
Strong experience in mechanical design within oil & gas, LNG, or petrochemical projects
Proficient in design and analysis of storage tanks, vessels, and thermal equipment
Working knowledge of FEA and stress analysis tools (ANSYS, STAAD, Caesar II)
Familiar with AutoCAD, and ideally 3D tools such as SmartPlant 3D, PDMS, or Inventor
Experience applying major design codes (API, ASME, Eurocodes)