If you work in technical sales, service, or engineering, your CV needs to do more than list responsibilities, it needs to prove commercial impact, technical credibility, and consistency.
Yet time and again, we see strong professionals underselling themselves because of a few simple errors.
Here are the biggest CV mistakes we see from engineers and sales professionals — and how to fix them.
1. Listing duties instead of achievements
❌ “Responsible for managing customer accounts.”
✅ “Managed 20 key accounts across the UK, increasing annual sales revenue by 18% in 12 months.”
Recruiters and hiring managers already know what a Service Engineer or Technical Sales Manager does, what they don’t know is what you achieved in the role.
Fix it:
Turn every bullet point into a measurable statement.
Think: What did you improve, save, or deliver?
- Did you increase uptime or reduce call-outs?
- Win new customers in a competitive sector?
- Support product launches that boosted market share?
Even one solid result per role is more persuasive than a long list of vague responsibilities.
2. Using a generic profile summary
Many CVs start with something like:
“Hardworking, motivated professional with excellent communication skills.”
That tells us nothing.
Fix it:
Your personal summary (the short paragraph at the top) should be tailored to your niche.
Focus on your sector, product area, and technical expertise, e.g.:
“Technical Sales Engineer with 8 years’ experience supporting instrumentation and flow control solutions across the UK & DACH region. Skilled in managing key accounts, developing OEM relationships, and delivering high-value capital equipment projects.”
Make it specific, measurable, and reflective of what you actually do.
3. Forgetting the commercial angle
One of the most common engineering CV mistakes?
Focusing purely on technical details and forgetting how your work drives commercial results.
Fix it:
Even if you’re a Service Engineer or Applications Specialist, link your technical work to business outcomes.
- “Reduced machine downtime by 12%, improving customer retention.”
- “Trained distributors to improve after-sales service quality.”
- “Identified opportunities for system upgrades that generated £300k in additional revenue.”
Companies hire engineers and technical salespeople who create value, not just maintain systems.
4. Not tailoring your CV for the role
Too many professionals send the same CV for every job.
But a hiring manager looking for a Sales Engineer (Flow Control) isn’t looking for the same things as one hiring a Field Service Engineer (Scientific Equipment).
Fix it:
- Adjust your headline and profile summary to match the role type (Sales / Service / Applications / Engineering).
- Prioritise experience with relevant products, systems, or customer types.
- Mirror some of the key words in the job advert — recruiters often use automated screening tools that look for exact matches.
It only takes 10 minutes to tailor your CV — and it can double your response rate.
5. Overloading technical jargon
While you should absolutely include product names, software, or systems, your CV shouldn’t read like a data sheet.
Fix it:
- Include key systems (e.g., PLCs, flow meters, vacuum systems, spectrometers) but keep context simple.
- Use plain English when describing your role — make it easy for HR, recruiters, and hiring managers to understand the relevance.
- Avoid long acronyms unless they’re industry-standard (e.g., OEM, OTE, KPI).
Clarity beats complexity every time.
6. Skipping the numbers
Numbers get attention — whether it’s sales growth, downtime reduction, project value, or customer coverage.
Fix it:
Whenever possible, quantify your work:
- “Managed £2.5m annual territory revenue.”
- “Delivered 120+ on-site service visits per year with 98% customer satisfaction.”
- “Supported installation of systems across 5 European markets.”
If you don’t have access to exact figures, use percentages or approximate ranges. The goal is to make your results tangible.
7. Forgetting keywords for your sector
LinkedIn, job boards, and internal ATS systems all rely on keywords. If your CV doesn’t contain the right ones, it might not even reach a recruiter’s screen.
Fix it:
Include sector-relevant terms throughout your CV.
For example:
- For Technical Sales: Key Account Management, Channel Development, OEM, CAPEX Projects, CRM, Solution Selling.
- For Engineering/Service: Preventative Maintenance, Installation, Calibration, Commissioning, Fault-Finding, Customer Training.
You don’t need to stuff them in — just make sure they appear naturally in your profile and experience.
8. Poor structure and formatting
You could have all the right content — but if your CV looks messy or hard to read, it won’t get far.
Fix it:
- Keep it to 2 pages (3 max if you’ve had a long career).
- Use clear headings: Profile, Key Skills, Experience, Education.
- Save as a clean PDF with your name in the title (“John-Smith-Technical-Sales.pdf”).
- Avoid tables or graphics that can break when uploaded to job portals.
A professional, easy-to-scan CV instantly gives the impression of organisation and clarity — key traits in both sales and engineering.
9. Ignoring LinkedIn consistency
Many candidates update their CV but forget LinkedIn — yet recruiters cross-check both instantly.
Fix it:
- Make sure your job titles, dates, and employers match on both documents.
- Add achievements or project summaries that expand on your CV.
- Include a professional headshot and concise headline.
A strong CV gets you noticed — but a well-aligned LinkedIn profile builds trust.
10. Leaving out the human element
Technical professionals often skip softer skills — but leadership, teamwork, and communication are critical, especially for customer-facing engineers and sales roles.
Fix it:
Show evidence of collaboration, adaptability, and initiative.
- “Worked cross-functionally with design and production teams to meet customer specs.”
- “Delivered technical presentations to non-technical stakeholders.”
These details reassure employers you can represent the business as well as the technology.
In summary
A standout CV doesn’t need to be flashy, it just needs to show impact, clarity, and relevance.
If you’re looking for a a new opportunity, you can see our live vacancies here.
