DevOps Engineer Cover Letter Example

How to write a DevOps cover letter that stands out

DevOps cover letters have a unique challenge: the work is often about making things boring and predictable, which is exactly what good infrastructure should be. But "I kept the servers running" does not make for a compelling letter. You need to show the before-and-after of your improvements and the scale you operate at.

This example comes from Rhys Thornton, a DevOps engineer at Booking.com applying to the Co-operative Group. He manages 1,400 containers across 3 EKS clusters handling 28 million API requests a day. Let's see how he turns infrastructure work into a persuasive cover letter.

Lead with scale, then show improvement

Rhys opens with numbers that immediately establish credibility: 1,400 containers, 3 EKS clusters, 28 million daily API requests. Before the hiring manager has finished the first paragraph, they know this candidate operates at serious scale.

Then he gets into improvements. He cut CI/CD pipeline times from 22 minutes to 7, which increased daily deployments from 3 to 12. His blue-green deployment strategy reduced production incidents during releases from 6 per month to 1. These are the kinds of numbers that tell a clear story: things were slow, and I made them fast.

Your takeaway: Always frame DevOps work as a transformation. What was the state before you arrived? What did you change? What was the measurable result?

Cost savings get attention

Rhys mentions building a cost monitoring dashboard that found 180,000 pounds a year in unused EC2 and RDS resources, all decommissioned within two months. This is gold for a DevOps cover letter because it translates infrastructure work into money saved, something every hiring manager understands.

If you have identified and eliminated wasted cloud spend, reduced licensing costs, or optimized resource allocation, include it. Cost savings are one of the easiest ways to show business impact from a DevOps role.

Certifications matter in DevOps

Rhys holds a CKA, AWS Solutions Architect, and Terraform Associate certification. In DevOps, certifications carry more weight than in many other engineering roles because they signal hands-on familiarity with specific platforms. Mention them, but keep it to one sentence. The work itself should do most of the talking.

Connect to the company's infrastructure challenges

Rhys closes by noting the Co-op's unusual breadth: retail, insurance, funeral care, all running on shared platforms. This shows he has thought about what makes platform engineering at the Co-op different from platform engineering at Booking.com. He is not just looking for any DevOps job.

Your DevOps cover letter structure

1. Opening: Scale you currently operate at + why this company interests you
2. Middle: 2-3 improvements with before/after numbers (pipeline speed, incident reduction, cost savings)
3. Closing: Certifications (one line) + specific interest in this company's infrastructure challenges

Final thoughts

The best DevOps cover letters make invisible infrastructure work visible and valuable. Show the deployments you sped up, the incidents you prevented, and the money you saved. That is the story hiring managers want to hear.