Senior Mechanical Engineer

Wolviston Management Services; United Kingdom; Hybrid; GBP 45,000 - 70,000; Full time

Job summary

A leading engineering firm is seeking an experienced Senior Process Engineer in Darlington. You will lead mechanical design and analysis for oil, gas, and LNG projects. Candidates should have a degree in Mechanical Engineering and strong experience in the sector. The role offers hybrid working, career development, and excellent benefits including up to 28 days of holiday and significant employer contributions to pensions.

Benefits

Flexible working hours

Hybrid working options

25 days holiday (rising to 28)

10% employer pension contributions

Free secure parking

Life insurance (4x salary)

Wellbeing initiatives like yoga classes

Qualifications

• Strong experience in mechanical design within oil & gas, LNG, or petrochemical projects.
• Chartered Engineer status (or working towards) is desirable.
• Proficient in design and analysis of storage tanks, vessels, and thermal equipment.

Responsibilities

• Deliver mechanical design of ambient and cryogenic storage tanks, pressure vessels, and heat exchangers.
• Conduct engineering calculations, stress assessments, and finite element analysis.
• Prepare and check technical documents including design reports and specifications.

Skills

Mechanical design

Engineering calculations

Finite element analysis (ANSYS, STAAD, Caesar II)

Design codes (API, ASME, Eurocodes)

Mentoring

AutoCAD

Education

Degree in Mechanical Engineering (BEng or MEng)

Tools

ANSYS

STAAD

Caesar II

SmartPlant 3D

PDMS

Inventor

Job description

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)