Accounting Assistant

Trilon Group ‚Ä¢ Portland, Oregon ‚Ä¢ Part Time ‚Ä¢ $49,920–$49,920 / year

Posted on Tue, Aug 11, 2026

We are seeking a detail-oriented and organized Part-Time Accounting Assistant to support our general accounting team. This role will focus primarily on reconciling employee expense reports and assisting with the collection and reconciliation of outstanding Accounts Receivable (AR). The ideal candidate is dependable, analytical, and comfortable working with financial data while maintaining accuracy and confidentiality.
Schedule: Part-Time (approximately 20–24 hours per week)
About Alta
Alta is a mission‑driven company working to mitigate climate change and advance safety and social justice by shaping sustainable, people‑centered communities. We bring together expertise across planning, design, engineering, education and encouragement programs, and community engagement to help communities thrive. Our work is grounded in the belief that how places are designed and experienced has a profound impact on equity, health, and opportunity—and that people should always be at the heart of those decisions.
Founded in 1996, Alta was at the forefront of the active transportation movement and has spent nearly 30 years partnering with communities to imagine a more connected, resilient, and inclusive future. Today, with more than 225 staff across the United States and beyond, we are a global leader in creating environments that support everyday life, strengthen human connection, and respond to the challenges of a changing world. Alta offers the opportunity to collaborate across disciplines, contribute to meaningful work at every scale, and be part of a team committed to making lasting, positive change for people and the places they call home.

Key Responsibilities

Expense Report Reconciliation

Review and reconcile employee expense reports for accuracy and compliance with company policies.
Verify receipts, coding, approvals, and supporting documentation.
Identify discrepancies and work with employees to resolve outstanding issues.
Assist with month-end reconciliation of expense-related accounts.
Maintain organized documentation and records for audit purposes.
Other tasks

Accounts Receivable Support

Monitor and reconcile outstanding customer invoices.
Contact clients regarding past-due invoices through email and phone in a professional manner.
Research payment discrepancies and resolve billing issues in collaboration with project managers and accounting staff.
Prepare aging reports and assist with AR follow-up activities.
Other tasks

Qualifications

Required

This position requires a combination of skills, experience and education including, but not limited to

High school diploma or equivalent required; Associate's degree in Accounting, Finance, or Business preferred.
1–3 years of accounting, bookkeeping, or accounts receivable experience preferred.
Experience reconciling financial transactions and reviewing expense reports.
Experience in Microsoft Excel, including sorting, filtering, formulas, and pivot tables.
Experience with accounting or ERP software is preferred.
Strong attention to detail and organizational skills.
Excellent written and verbal communication skills.
Ability to handle confidential information with discretion.
Ability to work independently and manage multiple priorities.

Preferred

There are a number of additional skills, experience, and education that would be beneficial to this position including, but not limited to:

Experience with ERP systems (Deltek Vantagepoint, Oracle, SAP, or similar).
Strong problem-solving and analytical skills.
Customer service mindset when communicating with employees and clients.

What We Offer

Compensation The pay rate for this position is $24/HR.

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