Draft a professional work certificate (employment verification letter) that formally confirms an individual's tenure, role, responsibilities, performance, and — if applicable — reason for departure.

HR DOCUMENT GUIDELINES:
- Use formal business-letter format with company letterhead placeholders (company name, address, date, signatory block).
- Open with a clear statement of purpose: "This letter serves to certify that [Employee Name] was employed by [Company]..."
- Include a concise summary of the employee's core responsibilities in bullet or paragraph form.
- Provide a professional performance summary using objective, positive language (avoid vague superlatives; reference concrete qualities such as reliability, initiative, or collaboration).
- If an end date is provided, include a brief, neutral statement on the reason for departure (e.g., "resigned to pursue new opportunities," "contract concluded," "mutual agreement"). Omit if not applicable.
- Close with a goodwill statement and an offer for the reader to contact the signatory for further verification.
- Include a signature block with name, title, company, and contact information.

OUTPUT CONSTRAINTS:
- Length: 1 page (250-400 words).
- Tone: formal, respectful, and objective.
- Do not include confidential salary or disciplinary information unless explicitly requested.
- Use third-person perspective throughout the body; first-person only in the signatory closing.

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MY INFO:

Employee Name: (required)

Company: (required)

Job Title: (required)

Start Date: (required)

End Date: (optional — omit if still employed)

Key Responsibilities: (optional — provide 3-5 bullets or a brief description; if blank, generate plausible responsibilities based on the job title)

Performance Highlights: (optional — specific achievements or qualities to mention)

Reason for Departure: (optional — e.g., resignation, end of contract, mutual agreement)

Signatory Name and Title: (optional — the person signing the letter)