Accounts Receivable/Payable Clerk

We are Natural Systems Design, a Washington-based environmental services and consulting firm. Founded in 2003, we are an interdisciplinary team with over 50 people with office locations in Seattle, Bellingham, and Port Angeles, Washington. We focus our efforts throughout Washington State. Our company was founded and grown with the intention of being a different kind of professional services and consulting company that prioritizes its people, science, the environment, and collectively making a positive impact.

Position Summary

The Accounts Receivable/Payable Clerk supports Natural Systems Design’s accounting department, with a primary focus on preparing accurate, timely project invoices for clients. This role works closely with project managers and accounting staff to gather billing information, resolve questions, and deliver invoices that meet client and contract requirements. Additionally, this role will support the accurate and timely processing of vendor invoices. The position also assists with routine accounting and administrative tasks.

NSD currently uses Deltek Ajera and plans to transition to Deltek Vantagepoint in the first quarter of 2027. The successful candidate will learn invoicing in Ajera, participate in training and testing for Vantagepoint, and adapt to the new system alongside the accounting department.

Position Location

(Seattle and/or Hybrid)

 
Key Responsibilities

• Prepare, review, and send client invoices in coordination with project managers and accounting staff.
• Confirm that invoices reflect project agreements, billing terms, approved expenses, and required supporting documentation.
• Maintain client billing contacts, invoice delivery instructions, and related project records.
• Respond professionally to client questions about invoices and help resolve billing discrepancies.
• Track invoice status, follow up on missing information, and assist with accounts receivable reporting and payment follow-up.
• Support the transition from Ajera to Vantagepoint, including training, testing invoice workflows, documenting procedures, and identifying issues.
• Coordinate vendor payments by gathering documentation, confirming payment details, and communicating payment status as directed by accounting staff.
• Assist with bank runs, including deposits and delivering banking documents.
• Assist with filing, recordkeeping, data entry, and other accounting tasks as assigned.

Qualifications

• Experience in accounts receivables and payables, invoicing, bookkeeping, or a related administrative accounting role.
• Strong attention to detail and ability to manage deadlines across multiple projects.
• Clear, courteous communication with clients and coworkers.
• Comfort learning accounting software and following documented procedures; experience with Ajera or Vantagepoint is helpful but not required.
• Proficiency with Microsoft Excel, Outlook, and other standard office tools.
• Ability to maintain confidentiality around financial, employee, client and vendor data.

What Success Looks Like

Invoices are accurate, complete, and sent on time. Project managers and clients receive clear responses to billing questions. Accounting records stay organized, routine tasks move forward reliably, and the transition to Vantagepoint is supported by someone willing to learn and improve the process.

Compensation

We offer a competitive salary and benefits, including up to a 4% match on 401(K), 7 paid holidays plus a day of service, and 4 weeks of paid time off accrued annually. Pay is $25-$28 hourly, depending on experience.

Start Date

The position's start date is flexible and will be negotiated with the selected candidate based on their availability.

Hours

We trust each other as professionals and respect each other as people. For us, this means staff have the autonomy to manage when they come into the office and when they work from home. Our staff have flexibility as non-exempt hourly positions. Hourly means when needed you could work less than a 40-hour week and conversely additional hours worked beyond 40 hours are compensated at a 1.5x hourly rate. 

Closing Date

Applications will be accepted until the right candidate is found.

We are an equal opportunity employer. All candidates will be considered for employment without regard to race, color, religion, national origin, sex, sexual orientation, gender identity, age, or protected veteran or disabled status or any other category protected under law. In compliance with federal law, all persons hired will be required to verify identity and eligibility to work in the United States and to complete the required employment eligibility verification document form upon hire.

Why NSD? Here are a few reasons why you might want to work with us

Advocacy and Actions:
We take pride in our work to make the world a better place, and we advocate, with our clients, for the actions needed to make that happen.

Challenging Projects with Rewarding Clients:
We have a constant stream of challenging and interesting projects with great clients. We solely work on projects that benefit the environment and communities and only select project partners for collaboration that align with our vision and values.

Culture:
We strive to be an inclusive, welcoming, and understanding group of individuals who are proud of our culture, passionate about our clients, and dedicated to the impact-driven purpose of our work. We’re clear on who we are, why we’re here, and what we want most to experience in our daily lives.

Flexibility:
How, when, and where you work best - works best for us. We invest in honesty and integrity, with each of us holding personal responsibility. We are accountable to ourselves, each other, and our clients.

Innovation and Excellence:
We have developed a regional reputation for being purpose-driven and delivering innovative and excellent work. Our projects require holistic, innovative problem solving, and are often ones that don’t follow a linear development path. Here is where you will find us excel.

Interdisciplinary Teams:
We work in highly interdisciplinary teams and aim to consider ecological, geomorphic, hydrological, and engineering perspectives on every technical challenge. We rely on team values in all aspects of our work, and share knowledge and experience with, and across, project teams.

Investment in Growth:
We are invested in the wellbeing of our staff, and support professional growth in technical skills, soft skills, leadership opportunities, and overall career advancement. We encourage initiative and openness to learning new things.

Knowledge of Washington Waters:
We know the waters of Washington State. We help shape the landscapes and communities in the places we work and live in.

Restoration and Resiliency:
We work exclusively to advance aquatic and floodplain habitat restoration and watershed resiliency through applied science, analysis, planning, design, and monitoring, with climate change risk and resiliency integrated throughout our work.

Trust and Respect:
Clear is kind. We trust each other as professionals and respect each other as people. We communicate with empathy, active listening, and timely follow up, and follow through on our deliverable