Temp Office Administrator (until Mid July 2026)

Company:Trileaf Corporation is a nationwide environmental, architecture, and engineering consulting firm that assists clients with environmental due diligence, regulatory compliance, and engineering and architectural design. From its headquarters in St. Louis, MO, and multiple branch offices throughout the U.S., Trileaf serves the wireless communications, commercial real estate, and financial industries. Location:St. Louis, Missouri - 5 DAYS IN OFFICE Job Summary:Trileaf is seeking a TEMPORARY Office Administrator to assist our with administrative tasks. This position is based in our St. Louis, Missouri office and will require on-site work through the mid July 2026. The anticipated workload is 40 hours per week. Key Responsibilities: Provide a welcoming environment while greeting visitors Oversee daily operations to ensure a clean, functional and collaborative workspace Manage office supplies, equipment, and vendor services to maintain availability and efficiency Answer phone, route calls and take messages Serve as the primary contact for building management and external vendors for maintenance and office-related needs Provide occasional travel and meal coordination for management team Assist in preparing documents, reports and presentations as needed Support Accounting, with data entry, invoice tracking/submission and vendor correspondence Update client information in accounting software Support Activities Committee with office events, employee appreciation activities, and team-building initiatives Manage company announcements and employee welcome notifications Foster a welcoming and inclusive office culture to support team engagement Support HR administrative duties as assigned Maintain breakroom Other duties as assigned with potential growth in responsibility Basic Qualifications:To be considered, the resume of the applicant must demonstrate the following qualifications/skills: Proven experience as an Office Manager, Administrative Assistant, or similar role Prior experience in clerical tasks, including electronic filing, data entry and record maintenance Familiarity with basic accounting principles – Accounts Receivable, Accounts Payable, General Ledger A proactive attitude and the ability to work independently Attention to detail and problem-solving abilities. Strong work ethic Excellent written and oral communication skills Strong client service skills with the ability to interact with all levels of management Critical thinking and problem-solving skills Ability to develop relationships with customers and team members Proficient in using office software, such as Microsoft Office Suite. Quick Books experience preferred Preferred Qualifications / Experience: Previous experience in administrative support  Associates degree or equivalent Benefits: Competitive hourly pay The listed salary range for this position is an expected range. The actual offer will be at the company's sole discretion and determined by relevant business considerations, including the final candidate's qualifications, years of experience, skillset, geographic location, and current market data. Trileaf Corporation is an equal opportunity employer that recognizes the value of diversity and inclusion in the workplace. We prohibit discrimination and harassment of any kind based on race, color, sex, age, religion, sexual orientation, national origin, disability, genetic information, pregnancy, or any other protected characteristic as outlined by federal, state, and local laws in jurisdictions where we operate.