DI Jobs
  • Home
  • Search Jobs
  • Job Board Advertising Packages
  • Post a Job
  • Sign in
  • Sign up
  • Home
  • Search Jobs
  • Job Board Advertising Packages
  • Post a Job

Refine Search
Current Search
London Onsite principal mechanical engineer
Search within
50 miles
10 miles 20 miles 50 miles 100 miles 200 miles
Refine by Categories
Engineering  (36) Executive & Management  (5) Transport & Logistics  (2) Information Technology  (1)
Refine by Job Type
Permanent  (31) Full Time  (7) Contract  (6)
Refine by Salary Range
£75,000 - £100,000  (1) £100,000 - £150,000  (2)
Refine by County
Greater London  (26) West Sussex  (10) Berkshire  (3) Hertfordshire  (2) Cambridgeshire  (1) England  (1)
Hampshire  (1) Kent  (1)
More
Aldwych Consulting
08 Oct, 2026
Permanent
Principal Mechanical Engineer
Aldwych Consulting London, UK
Principal Mechanical Engineer - London I'm currently working with a well-established built environment consultancy that is looking to bring an experienced Principal Mechanical Engineer into their growing London team. This is a great opportunity for a technically strong engineer who enjoys taking ownership of projects, leading design teams and having a real influence on the direction of projects from concept through to delivery. The Role You'll be responsible for leading mechanical design projects across the full project lifecycle, working closely with multidisciplinary teams, clients, contractors and other key stakeholders. Your responsibilities will include: Leading mechanical design projects from concept through to delivery Managing project scope, resources, programme and technical delivery Reviewing mechanical calculations, designs and CAD models Coordinating multidisciplinary design teams and ensuring technical quality Supporting R&D and introducing...
Rullion Ltd
06 Oct, 2026
Permanent
Senior/Principal/Mechanical Design Engineers - Water Design
Rullion Ltd London Colney, St Albans, UK
Senior/Principal/Mechanical Engineer My client is an engineering design consultancy working closely with a wide range of clients, across a number of disciplines within the UK rail and utilities industries. Full time role from the St Albans Office with occasional site visits for which travel expenses will be paid. Hybrid working possible when required provided agreed in advance. Can be contract (outside IR35) or permanent role. Responsibilities: Provide design deliverables that satisfy safety and quality requirements. Produce design calculations and drawings for the water industry Direct and develop CAD technicians. Prepare scopes for and check output of subcontract M&E design teams Liaise with, prepare specifications for and review tender responses from equipment suppliers and manufacturers Prepare design investigations, reports and specifications. Design in compliance with relevant technical, professional and group standards. Ensure project change for...
Thales
25 Oct, 2026
Full Time
Principle Mechanical Engineer
Thales Manor Royal, Crawley RH10, UK
Location: Manor Royal Crawley, United Kingdom Thales is a global technology leader with more than 83,000 employees on five continents. With over 7,500 people in the UK, operating across defence, space, aerospace, and digital security, we help build a future we can all trust. Thales supports the security and stability of our nation by providing extraordinary technology to our customers, as well as delivering social value to the UK with our products and services. Under Water Systems (UWS) Our purpose is to be the leading provider of underwater sensors and decision superiority, helping navies across the world keep our friends, families and all of us safe. We cover four sectors: Mine Counter Measures, Anti-Submarine warfare, Services and Future Capabilities. Primary Purpose of the Role: Be the Mechanical Engineering Lead for the UWS project, supporting product and development. To provide direction to the mechanical team and increase the capability of the Mechanical...
Aldwych Consulting
22 Oct, 2026
Permanent
Principal Electrical Engineer
Aldwych Consulting London, UK
Principal Electrical Engineer Location: Croydon or London Salary: Competitive, depending on experience Job Type: Full-time About the Company We are an established building services and engineering consultancy with a strong reputation across London and the South of England. The business works across a diverse range of sectors, including healthcare, education, commercial, residential, leisure and industrial projects. Its work covers electrical, mechanical and public health engineering, alongside energy, sustainability and low-carbon design. The company has built a stable team with excellent staff retention , with engineers able to develop their careers over the long term. The current Managing Director is a good example of this progression, having joined the business as an engineer before moving into senior leadership. The Role We are looking for an experienced Principal Electrical Engineer to take a leading technical role within the business. This is an...
Calibre Search
16 Oct, 2026
Permanent
Senior / Principal Electrical Engineer
Calibre Search Cambridge, UK
Senior/Principal Electrical Engineer Cambridge Up to 65k Overview Three and a half years ago, one of Cambridge's newer building services teams was just getting going. It's grown steadily since, built on a simple idea: take the best bits of the big consultancies and the best bits of the small ones, and leave the rigid banding and reduced autonomy behind. The mechanical side of that team is now well established. The electrical side needs reinforcing, and that's where this role comes in. The Role You'll join a growing Cambridge-based consultancy as an Electrical Engineer, reporting into an Associate who leads the discipline. The level is genuinely open, so whether you're operating at senior or principal capability, there's a route that fits. Get involved earlier in the design process. The team has historically leaned heavily on Stage 3/4 onwards work and is actively rebalancing towards more early-stage involvement Senior engineers are expected to lead their own...
Starling Bank
26 Oct, 2026
Permanent
Principal Security Programme Manager & Technical Lead - Engine by Starling
Starling Bank London, UK
Description At Engine by Starling , we are on a mission to find and work with leading banks all around the world who have the ambition to build rapid growth businesses on our technology. Engine is Starling's software-as-a-service (SaaS) business-the technology that was built to power Starling-and two years ago we split out as a separate business. Starling has seen exceptional growth and success, and a large part of that is down to the fact that we have built our own modern technology from the ground up. This SaaS technology platform is now available to banks and financial institutions all around the world, enabling them to benefit from the innovative digital features and efficient back-office processes that have helped achieve Starling's success. As a company, everyone is expected to roll up their sleeves to help deliver great outcomes for our clients. We are an engineering-led company and we're looking for people who will be excited by the potential for Engine's technology...
Aldwych Consulting
24 Oct, 2026
Permanent
Senior/Principal Electrical Engineer
Aldwych Consulting London, UK
Senior / Principal Electrical Engineer London The Opportunity We are looking for an experienced Electrical Engineer to join a growing engineering team, taking responsibility for the design and delivery of electrical building services across a varied portfolio of projects. This role would suit a technically strong engineer who enjoys solving complex design challenges, working with different project stakeholders and taking ownership of projects from early design stages through to completion. There is flexibility for candidates at both Senior and Principal level, depending on experience, technical expertise and leadership capability. The Role You will lead electrical design activities across multiple projects, ensuring solutions are technically sound, practical and aligned with project requirements. You will work closely with other members of the project team, external consultants and contractors to coordinate designs and resolve technical issues throughout the project...
Ma
24 Oct, 2026
Contract
Principal Engineer (Traffic and Road Safety)
£400 - £450 daily
Matchtech London, UK
Our client is seeking a Principal Engineer specialising in Traffic and Road Safety to support a contract role within a highways and transport environment. The role will provide professional leadership across traffic engineering, road safety, parking, walking, cycling and highway improvement programmes, helping to deliver safer, more accessible and sustainable transport schemes. Key Responsibilities: Lead the development and delivery of traffic management, road safety, casualty reduction, traffic calming, parking, walking, cycling and highway improvement schemes. Analyse collision, speed, traffic flow and other technical data to identify issues and develop suitable engineering interventions. Manage projects from feasibility and design through consultation, statutory processes, construction and post-implementation review. Prepare and review engineering designs, drawings, specifications, cost estimates, business cases and technical reports. Manage Traffic Management Orders...
Ja
23 Oct, 2026
Permanent
Principal Substation (Primary Design) Engineer - UK Grid Network
Jacobs London, UK
Principal Substation (Primary Design) Engineer - UK Grid Network Jacobs is playing a leading role in the global energy transition. As our UK and Continental Europe team continues to expand, we are seeking a Principal Primary Substation Engineer to support a range of high-profile projects across our Power & Energy portfolio. This includes high voltage AIS and GIS Substations, transmission system assets, HVDC interconnectors, and energy storage systems. Key Responsibilities: Lead FEED and detailed design workstreams for National Grid and DNO clients Ensure quality assurance and timely delivery of design packages and bids Review HV plant aspects including layouts, earthing, interlocking, busbar calculations, and specifications Coordinate with back-office engineers, suppliers, and subcontractors Attend and contribute to design reviews, hazard reviews, FAT and SAT Provide technical leadership and mentoring to junior engineers Support tendering activities and contribute...
Strata Construction Consulting UK Ltd
21 Oct, 2026
Permanent
Principal Structural Engineer
Strata Construction Consulting UK Ltd London, UK
A well-established and highly respected structural engineering consultancy is looking to appoint a Principal Structural Engineer for their central London office near Holborn. This is an excellent opportunity for a Chartered Engineer who enjoys autonomy, client interaction, and working on technically varied refurbishment projects across a broad range of sectors. The business has built a strong reputation for delivering practical, high-quality engineering solutions and maintains long-standing relationships with a number of blue-chip and repeat clients. The successful candidate will join a close-knit and collaborative team delivering predominantly refurbishment and survey-led projects across the retail, residential, commercial and industrial sectors. Typical project values are below £5m, offering the chance to work across numerous fast-paced schemes simultaneously while maintaining strong client relationships throughout the project lifecycle. This role would suit someone who...
360 Recruitment
21 Oct, 2026
Permanent
Junior Environmental Engineer
360 Recruitment London, UK
Junior Environmental Engineer Central London £28,000 - £40,000 DOE + Benefits Are you a recent graduate or an Environmental Engineer with a few years of industry experience looking to develop your career with a leading contractor? Our client is an award-winning principal contractor specialising in earthworks, remediation, enabling works, and demolition , delivering complex projects across the UK. Due to continued growth, they are looking to appoint a Junior Environmental Engineer to support a variety of major earthworks and remediation schemes across London. This is an excellent opportunity to gain hands-on experience in a site-based role, working alongside experienced environmental and engineering professionals on challenging brownfield regeneration and infrastructure projects. The Role As a Junior Environmental Engineer, you will be involved in a broad range of environmental and geotechnical activities, supporting project delivery from site investigation through...
Sa
21 Oct, 2026
Permanent
Head / Senior Product Manager - Platforms, Mobile, Technical
Sanderson London, UK
Head of Product - Mobile & Web Platform / Senior Product Manager / Senior Technical Product Manager / Head of Product / Head of Mobile Product / Head of Platforms We are looking for an experienced Head of / Senior Technical Product Manager to lead product management across our Web and Mobile Platforms. The role will connect platform strategy, stakeholder demand and engineering delivery, helping the teams build scalable, reusable, secure and high-quality capabilities for digital customer experiences. The successful candidate will act as the bridge between Engineering, Product, Architecture, Security, Delivery and business stakeholders. They will create clarity on what the platform teams should deliver, why it matters, how it will be prioritised, and how delivery will be coordinated across teams and systems. This role is suited to someone who is comfortable operating in a highly technical environment and who sees internal platforms as products. The platforms provide...
Aldwych Consulting
16 Oct, 2026
Permanent
Intermediate Civil Design Engineer
Aldwych Consulting London, UK
Civil CAD Technician / Engineer - Godalming / Waterloo Location: Godalming / Waterloo, London Salary: 33,000 - 42,000 DOE Type: Full-Time Permanent Working Pattern: Hybrid The Opportunity An established, independently owned transport planning and infrastructure consultancy is looking to appoint a Civil CAD Technician / Engineer to join its growing infrastructure team. This is an excellent opportunity for someone with 1-4 years' experience to develop their technical skills while working on a varied portfolio of development-led projects across residential, commercial, leisure, healthcare and other sectors. You'll work closely with experienced Principal Engineers, gaining exposure to the full project lifecycle, from feasibility and planning through to detailed design and construction. With a close-knit team and a strong focus on professional development, you'll have the opportunity to take on responsibility early and build towards ICE professional registration....
Intercontinental Exchange Holdings, Inc.
16 Oct, 2026
Full Time
Principal Product Manager
Intercontinental Exchange Holdings, Inc. London, United Kingdom
Job Description: ICE Data Services, a subsidiary of Intercontinental Exchange, is looking for a Principal Connectivity Product Manager to join the ICE Global Network (IGN) product team based in London. The ICE Global Network offers unique content, delivery and execution services through an ultra-secure, highly resilient network. The IGN team manages the Connectivity business including Colocation, Connectivity, Hosting, Content access and Wireless. This role is an opportunity for you to be at the center of the fast-paced IGN business.   The Manager will act as the technical architect for bespoke and non-standard connectivity solutions, partnering with Sales Engineering and Network Engineering to assess feasibility, design, and commercial viability for use cases that fall outside our standard product catalog. This is a hands-on, design-forward role for someone who enjoys sitting at the boundary between engineering and product.   Working across both internal and external...
Randstad Construction and Property
08 Oct, 2026
Permanent
SUB AGENT - RC & LUL Civils
Randstad Construction and Property London, UK
Freelance Sub Agent - RC & LUL Civils Location: Central London Rate: £430 per day (CIS) Contract Length: 6 months+Are you an experienced Sub Agent with a strong background in reinforced concrete and general civils ideally within a London Underground (LUL) environment? We are partnering with a highly respected specialist sub-contractor to deliver a critical package of works in Central London. You will be the operational lead on site, ensuring that complex RC structures and civils packages are delivered safely, on time, and strictly in line with LUL standards. The Project Scope: Complex Reinforced Concrete (RC) works in the "back of house" LUL station environment. General civil engineering packages. Logistically challenging shaft backfill operations. Key Responsibilities: Driving the day-to-day delivery of the RC and civils packages, managing both direct labor and specialist sub-contractors. Writing, reviewing, and implementing complex RAMS, ITPs, and...
Infosys
08 Oct, 2026
Palantir Engineer Specialist - Enterprise AI
Infosys London, UK
Palantir Engineer Specialist Enterprise AI practice London About Us Do you want to boost your career and collaborate with expert, talented colleagues to solve and deliver against our clients' most important challenges? We are growing and are looking for people to join our team. You will be part of an entrepreneurial, high-growth environment of 300.000 employees. Our dynamic organization allows you to work across functional business pillars, contributing your ideas, experiences, diverse thinking, and a strong mindset. Are you ready? About Your Role As a Consultant – Palantir Engineer , you lead and deliver end-to-end, data-driven solutions using Palantir Foundry in complex client environments. You operate at the intersection of engineering, data, and consulting, working closely with business and technical stakeholders to translate complex problems into scalable, production-ready solutions. You combine strong hands-on technical skills with a consulting mindset,...
AT
07 Oct, 2026
Permanent
Wastewater Engineers & Modellers - Various
Advance TRS London, UK
Engineer to Associate South East & East of England Multiple Opportunities Multiple opportunities available following recent framework awards I'm working with a leading multidisciplinary engineering consultancy that has recently secured a number of significant frameworks, creating several opportunities within its growing Wastewater team. The business delivers a diverse range of infrastructure projects across the UK regulated water sector, alongside programmes within aviation, energy, rail and transportation and selected international projects. This provides the opportunity to work across a varied project portfolio, with exposure to different clients, challenges and types of infrastructure. They are looking for experienced Wastewater Modellers and Wastewater Engineers from Engineer through to Associate level, with opportunities available across the South East and East of England. The role Depending on your background and level of experience, you could be involved in:...
Randstad Construction and Property
07 Oct, 2026
Contract
PTS Site Engineer
Randstad Construction and Property London, UK
PTS Site Engineer Location: West London Type: Contract ( Inside IR35 ) Project: Long-Term Rail Infrastructure Project Shift Pattern: Day Shifts, Night Shifts, and Weekend Possession Work (as required) The Role Are you an experienced Site Engineer with a valid PTS card looking for a long-term contract in West London ? We are seeking a high-caliber PTS Site Engineer to join a major rail infrastructure project delivered by a Tier 1 Principal Contractor . In this role, you will lead on-site civil engineering activities, manage quality compliance, and drive rigorous standards across network assets. Note: This position has been determined as Inside IR35 . Key Responsibilities Site Supervision & Principal Contractor Liaison: Oversee day-to-day civil engineering activities on site, ensuring full compliance with design specifications, Network Rail standards, and Principal Contractor safety frameworks. Quality & Assurance Compliance: Lead the...
AT
07 Oct, 2026
Permanent
Cleanwater Engineers & Modellers - Various
Advance TRS London, UK
Engineer to Associate South East & East of England Multiple Opportunities Multiple opportunities available following recent framework awards I'm working with a leading multidisciplinary engineering consultancy that has recently secured a number of significant frameworks, creating several opportunities within its growing Clean Water team. The business delivers a diverse range of infrastructure projects across the UK regulated water sector, as well as programmes within aviation, energy, rail and transportation and selected international projects. This offers the opportunity to work across a genuinely varied project portfolio rather than being focused on a single client or programme. They are looking for experienced Clean Water Modellers and Clean Water Engineers from Engineer through to Associate level, with opportunities available across several locations in the South East & East of England. The role Depending on your background and level of experience, you could...
Ma
07 Oct, 2026
Permanent
Chartered Principal Geotechnical Engineer
Matchtech London, UK
This is a senior-level opportunity for an experienced Principal Geotechnical Engineer to join a growing geotechnical team based in London, playing a key role in the delivery of major UK and international infrastructure projects. The Role As a Principal Geotechnical Engineer, you will lead the development and delivery of high-quality geotechnical engineering solutions across a diverse portfolio of large-scale projects. Working within multidisciplinary teams, you will provide technical leadership, oversee project delivery, and support the development of junior engineers. Key responsibilities include: Leading and delivering geotechnical assignments across the UK, Ireland, and internationally. Undertaking geotechnical design and analysis throughout all project stages, from concept development through to detailed design. Reviewing and checking internal and third-party designs to ensure technical excellence and compliance with relevant standards. Identifying opportunities for...
  • Home
  • About Us
  • Recruitment Blog
  • Terms & Conditions
  • Privacy & Cookies Policy
  • Employer
  • Post a Job
  • Job Board Advertising Packages
  • Diversity, Inclusion & Equality (ED&I) Articles
  • Sign in
  • Contact Us | Recruiters
  • Job Seeker
  • Find Jobs
  • Upload CV
  • Job Seeker Help & Advice
  • Equal Opportunities Monitoring Form
  • Sign in
  • Contact Us | Jobseeker
  • Facebook
  • X / Twitter
  • LinkedIn
© 2026 DIjobs Limited  |  3rd Floor, 86-90 Paul Street, London EC2A 4NE  |  Company Registration: 13316146  |  VAT No: GB 377358650
Diversity Job Board | Inclusion | Equality | ED&I | DEI | EDI | D&I | DEIB | IDEA | BDI | Jobboard | Vacancies | Diversity Jobs | Careers | Jobsite | Diversity and Inclusion Job Boards | Find a New Job | Job Search with DI Jobs