First Recruitment Group
Senior Mechanical Engineer

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Mechanical Engineer (Open to Senior and Permanent level)
Derby – 4 or 5 days per week in the office, potentially 1 day per week from home
Inside IR35 or permanent staff role
Nuclear sector – open to experience from other highly regulated sectors
A Senior/ Principal Mechanical Engineer is required to work for a large Nuclear company based in Derby on either an inside IR35 contract basis or a permanent staff basis.
This role will be ideal for a candidate with experience in either the Nuclear sector or other highly regulated sectors such as Aerospace/ Defence
Flexibility will be provided with the software experience
Your Missions:
- To have experience in reviewing concessions of engineered parts and ensuring they meet with Engineering Standards, design intent, and update engineering substantiation documentation to ensure the component satisfies fit, form, and function.
- As the Senior/ Principal Mechanical Engineer, you will have a good understanding of modelling and drawing practices and be able to demonstrate appropriate CAD competencies for integration and modification activities.
- Be influential and experienced across all stages of the design lifecycle (e.g., creating analysis models using ANSYS or ABAQUS, producing tolerance stack calculations, creating, developing, and maintaining the master model and associated definition - model-based design (MBD) and 2D).
- As the Senior/ Principal Mechanical Engineer, you will have experience in Design for Manufacture activities and a deep understanding of manufacturing buy-off processes, right through to supporting parts in service.
- To have strong manufacturing process understanding in machining, castings, forgings, rotary equipment, and an appreciation of welding techniques.
- As the Senior/ Principal Mechanical Engineer, you will experience managing and maintaining data integrity is vital to this role, so attention to detail is essential.
- Created and maintained per company procedures, definition/drawing standards, models/definitions at component and assembly levels, examining interfacing components, and identifying problems based on nominal or adverse tolerance effects during manufacturing processes.
- As the Senior/ Principal Mechanical Engineer, you will collaborate and communicate with design, manufacturing, and the wider integrated project team, offering support at gated reviews.
- Support junior team members and work effectively in a team-oriented environment.
Reasons to use Rodeo
I’m in my final year doing Economics and I don’t know whether to apply for grad schemes now or do a masters first. What do you think?
Honest answer — it depends on where you want to end up. A lot of top grad schemes (Big 4, civil service, banking) don’t need a masters. Let’s look at the ones you’d be competitive for now, and we can decide if a masters actually adds anything.
Also worth knowing: most autumn 2026 applications are open now. Timing matters more than you think.
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Graduate Consultant — 2026 Scheme
Why you're a good match
StrongYour economics background and your summer at a regional bank line up with what PwC looks for on the consulting scheme. Applications close in four weeks.
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Why you're a good match
You’ve got the grades and the economics background, and your bank internship is exactly the experience this scheme looks for. Apply soon — deadlines close within the month.
Experience fit
Your summer at the bank plus your econometrics coursework map directly to the day-one responsibilities on this scheme — client modelling, market briefings, and deal support.
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- Experience as a Senior or Principal Mechanical Engineering in the nuclear, aerospace, or regulated sector
- As the Senior/ Principal Mechanical Engineer, you will have experience in ASME Y14.5, GD&T or equivalent standard.
- Understanding of safety legislation and obligations
- High degree of knowledge around Design for Manufacture & inspection methods.
- As the Senior/ Principal Mechanical Engineer, you will have familiarity with 3D CAD systems (Siemens NX or similar) for model and drawing creations
- Familiarity with PLM systems (Teamcentre or similar)
- Professional qualification in an engineering related field
First Recruitment Group are committed to finding the right candidates for our clients, and the right companies for our candidates to work for. We’re passionate about putting people first, and take pride in being able to offer an all-round service for candidates and clients with our payroll solution, Primis, and workforce management solution, Operam.
As part of putting people first, we strive to be an equal opportunities employer and we are always looking to increase the diversity of our workforce, working closely with our clients to ensure everyone is included.
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