Senior Process Engineer in Basildon

For over 25 years, Addison Project plc has delivered innovative, sustainable engineering solutions across the chemical, pharmaceutical, energy, and food & beverage sectors. As a family‐owned business with UK‐wide coverage, we combine technical excellence with a collaborative, client‐focused approach. Our fully integrated EPCM capability supported by strong CDM and HSSEQ leadership and accredited management systems ensures projects are delivered safely, efficiently, and to the highest standards from concept through to commissioning and start‐up.

If you’re passionate about engineering and want to join a dynamic, people‐focused consultancy driving progress and sustainability across the UK’s manufacturing and process industries, Addison Project is the place to grow your career.

Role: Senior Process Engineer (Contract – Outside IR35)

Location: Harlow

Contract: 12 months

Start Date: Spring 2026

Workscope: Addison Project Plc invites expressions of interest from suitably qualified independent (PSC) contractors to provide Senior Process Engineering Services. The services will be delivered from our Harlow office and will also require site presence for our project in Greater London.

Scope of Services:

• Producing process calculations, datasheets and equipment specification sheets
• Developing PFDs and P&IDs
• Producing alarm/trip schedules and cause & effect diagrams
• Generating process reports and control philosophies
• Supporting plant troubleshooting activities
• Producing equipment, piping, valve, inline item and instrument schedules
• Checking and approving technical documents
• Liaising with vendors and reviewing vendor information
• Participating in HAZID/HAZOP/LOPA reviews
• Completing Hazardous Area Classification and DSEAR assessments

Experience & Qualifications:

• Chemical Engineering degree (essential)
• Chartered Engineer status (desirable)
• Strong experience within a UK onshore process engineering design team within either a petrochemical, chemical, oil & gas, pharmaceutical or food and beverage industry
• Proven knowledge and experience of HAZOP, DSEAR and ATEX in a COMAH environment, including carrying out Hazardous Area Classification Assessments
• The ability to lead HAZOP Studies (desirable)
• Ability to work to a high level of autonomy and to produce high quality results
• Passion for delivering safe, fit for purpose, accurate design, completed to cost and programme
• Ability to be adaptable and to drive progress to meet targets
• Thorough approach with attention to detail and the ability to recognise and minimise risks
• Ability to work in a multi-discipline team
• Willing to lead a project with a small team; supporting less experienced engineers
• Willing to work in the Engineering design office in Harlow and attend site as necessary in Greater London

How to Express Interest: If you are an experienced Senior Process Engineer looking for a flexible, Outside IR35 opportunity and would like to be considered for this role, please submit your application today.

Important Information For Applicants: In accordance with current legislation, this position is only open to candidates who have indefinite eligibility to work in the UK. Unfortunately, we are unable to offer sponsorship.

Notice To Recruitment Agencies: We do not accept unsolicited CVs or profiles from recruitment agencies. Please do not forward CVs to any of our employees. The Company will not be liable for any fees associated with unsolicited submissions.

Application Outcome: If you have not heard from us within two weeks of submitting your application, unfortunately you have not been shortlisted at this time. If this is the case, we thank you for your interest and wish you every success in your future career.