Dear [Hiring Manager Name], I am applying for the [Software Engineering Role] position at [Company Name]. Your team's work on [specific product or technical problem] connects with my experience in [relevant area]. In [project or role], I built [system or feature] using [languages and tools you actually used]. My contribution included [design, implementation or testing responsibility]. The work resulted in [an outcome you can substantiate], and I documented [a relevant trade-off or operational consideration]. I also worked with [colleagues or stakeholders] to clarify requirements and review changes. That experience would help me contribute to the role's focus on [a responsibility from the vacancy]. My resume and [portfolio or repository, if appropriate] are [attached or linked]. I would welcome an interview to discuss the project and how I approach reliable software delivery. Sincerely, [Your Name]