Administrative Assistant
Join Mariana Minerals as an Administrative Assistant to support the CFO and day-to-day operations in a dynamic environment.
Posted by employer 2 days ago
First seen on Joblaze 1 month ago
Last verified on the company career page 1 day ago
Requirements
- Experience
- 1–3 years
Not disclosed in this posting: compensation, visa sponsorship.
Joblaze summary
The Administrative Assistant at Mariana Minerals plays a crucial role in supporting the CFO and ensuring smooth daily operations within the Houston office. This position requires proficiency in Microsoft Office, strong organizational skills, and the ability to manage calendars, travel logistics, and expense reports. Ideal candidates are early in their careers, detail-oriented, and adaptable to a fast-paced environment. Mariana Minerals emphasizes a culture of safety, ownership, and collaboration as it seeks to innovate in the minerals supply chain.
Joblaze insights
- Listed about a month ago — first seen on Joblaze September 3, 2026. Last confirmed on Mariana Minerals's careers page October 29, 2026.
Quick facts
- Is the Administrative Assistant role remote?
- No — this is an on-site role in Houston, TX.
- How much experience is required?
- 1–3 years of relevant experience for this Administrative Assistant role.
- Where is the role based?
- Mariana Minerals is hiring for this position in Houston, TX.
- What seniority level is this role?
- Mariana Minerals targets junior candidates for this position.
- Is this full-time or contract?
- Full-time for this Administrative Assistant role at Mariana Minerals.
From the original posting
The Role
The Administrative Assistant will provide administrative / executive support to the CFO, including calendar and travel coordination and expense management, while also supporting day-to-day office operations. The role will also serve as backup to the Executive Assistant as needed. This position requires strong communication skills, flexibility, sound judgment, and the ability to manage competing priorities in a fast-paced environment. This role is ideal for someone early in their career who is detail-oriented, resourceful, and eager to grow within an operations or executive support function.
What You’ll Do
Administrative & Calendar Support
Assist with scheduling meetings, managing calendars, and coordinating internal and external appointments
Help prepare meeting materials, agendas, and notes as needed
Support coordination of cross-functional meetings and company events
Travel & Logistics
Book and manage domestic and international travel (flights, hotels, ground transportation)
Handle last-minute travel changes and troubleshoot logistical issues
Expense & Reporting Support
Prepare and submit expense reports in a timely and accurate manner
Reconcile receipts and assist with tracking budgets or spending reports
Executive Assistant Backup
Serve as backup to the Executive Assistant during absences
Provide overflow support during high-volume periods
Assist with special projects and ad hoc requests
Desired Qualifications
1–3+ years of administrative / executive or office support experience preferred
Strong organizational skills and attention to detail
Excellent written and verbal communication skills
Proficiency in Microsoft Office
Experience with expense management and calendar systems preferred
Ability to handle confidential information with discretion
Strong time management and prioritization skills
Problem-solving mindset
Professional and service-oriented approach
Adaptability in a fast-paced environment
Team player with a positive attitude
Our culture is built on four principles:
Standard company text repeated across Mariana Minerals's postings is omitted here.