All job profiles

Junior Machine Learning Engineer

Entry-level Machine Learning Engineer specialized in building, optimizing, and deploying machine learning models to production. Works under supervision to establish robust ML pipelines, model serving systems, and ML infrastructure, combining ML engineering expertise with software engineering practices.

Cover letter ready to customise

[Prénom Nom] · [Adresse] · [Email] · [Téléphone]
[Date] · [Ville]

Dear Hiring Manager,

As a recent graduate with 2 years of hands-on experience on topics related to the Junior Machine Learning Engineer role, I'm reaching out with a strong interest in [Company Name]. Your posting really resonated with me, especially [restate one sentence from the ad that hooked you].

My expertise on Python, SQL and Scikit-learn has allowed me to [concrete, quantified outcome, e.g.: cut deployment time by 40% / ship a product to 200k users / industrialise the data pipeline]. I particularly enjoy [what drives you: impact, complexity, autonomy, team…], exactly what I found in your job description.

Beyond technical skills, I'm known for [one or two soft skills drawn from your day-to-day, e.g.: structuring complexity / collaborative work with product and design]. Joining [Company Name] would let me bring that to [a specific challenge mentioned in the ad or visible in your product].

I'd love to discuss your project and the value I can bring. In the meantime, thank you for considering my application, I'm available at your convenience for an interview. Best regards, [First Last]

Letter structure

  • Hook (1 sentence): why this company specifically, not a generic letter.
  • Paragraph 1: who you are in 1 sentence, plus what resonated in the ad.
  • Paragraph 2: your 2 or 3 key skills tied to the role, with a quantified result.
  • Paragraph 3: your soft skills and what you want to bring to the team.
  • Closing: propose a conversation, without being pushy.

Tips to personalise

  • Replace every [bracket] with something concrete, otherwise the recruiter immediately senses the generic letter.
  • Don't restate your CV: add what's not there (motivation, reasoning, context).
  • 1 page maximum, ideally 250 to 350 words. Shorter equals more read.
  • Address it to a person (Hiring Manager, X team) rather than 'Dear Sir/Madam' when possible.

Other roles in the same family

Junior AI EngineerLead Machine Learning EngineerSenior AI EngineerSenior Machine Learning Engineer

Go further with Traject

Traject takes you from a generic letter to a truly targeted one. You paste the job ad, the AI extracts the key expectations and rewrites every paragraph from your CV: company-specific hook, skills paragraph with your real numbers, motivation aligned with the role's stakes. You show up to the recruiter with a letter that speaks to them, not a generic copy-paste.

Frequently asked questions

Avoid "Following your ad". Start with a concrete hook: "Your [X] approach on [product/project] really stood out to me. Here's why I think I can contribute as a Junior Machine Learning Engineer."

Not mandatory for most tech ads. But it remains a strong differentiator: 70% of candidates don't include one, those who do often move ahead.

250 to 350 words, maximum 1 page. Recruiters spend on average 30 seconds skimming it.

Yes, that's precisely what makes it effective. Echoing 2 or 3 keywords from the ad in the letter is essential.