Senior Backend Engineer, Billing & Microservices (Remote)

FirstMile Ventures; United States; On-site; Full time

Job description

Pax8 is hiring aSenior Software Engineer II (Remote, USA) to build resilient billing and invoicing services that power our marketplace — and to help shape how modern engineering teams deliver with quality and AI-enabled acceleration.

🚀 Why this role is a big deal

This is a high-impact, hands-on engineering role on ourInvoicing/Billing Engineering team, where your work directly supports the monthly billing run that keeps Pax8 moving. You’ll own complex backend services end-to-end, raise the technical bar through mentorship and thoughtful design, and help modernize a legacy estate into scalable microservices — all while growing alongside Pax8’s evolving, pragmatic approach toartificial intelligence (AI) tooling in day-to-day delivery.

🌈 Life at Pax8 (and why people stay)

Pax8 is where high standards meet good humans. We’re passionate, creatively offbeat, and deeply committed to building a culture where you can do your best work without losing yourself in the process. If you like solving meaningful problems with smart teammates — and you value pace, trust, and humor — you’ll feel at home here.
Learn more about our mission and culture:https://www.pax8.com/en-us/about/
Explore what we’re building and celebrating:https://www.pax8.com/en-us/news/

🧩 What you’ll do day-to-day

• 🧱Build backend services that matter — design, develop, test, deploy, and support core billing and invoicing workflows that run at scale.
• 🔍Own complex problems end-to-end — from shaping a solution to shipping it safely, monitoring it in production, and continuously improving it.
• 🧭Modernize the platform — help drive legacy-to-microservices migration to improve scalability, deplorability, and maintainability.
• 🤝Partner across the business — collaborate closely with engineers, product partners, and adjacent teams to land outcomes that solve real problems.
• 🧠Lead through craft and clarity — contribute to design and code reviews, share patterns, and mentor teammates to raise quality and consistency.
• 🚨Join the on-call rotation — with increased responsibility during monthly billing runs and lighter coverage outside billing windows.
• 🤖Use AI responsibly to accelerate delivery — leverage modern AI tools to speed up scaffolding, refactoring, documentation, and throughput while owning correctness, performance, and maintainability.
  

🌟 The impact you’ll have

You’ll help ensure partners and customers experience accurate, reliable billing — month after month — while strengthening the engineering foundations behind Pax8’s marketplace. Your technical ownership and steady delivery will unlock faster change, safer releases, and a team that continuously levels up.

⭐ What you’ll bring

• Substantial backend engineering experience, ideally building services inJava withSpring/Spring Boot in production environments.
• Proven ability to design and ship microservices and work effectively with distributed, highly available systems.
• Confidence navigatinglarge, evolving codebases — refactoring safely, reducing risk, and improving systems incrementally.
• Strong engineering judgement aroundquality, testing strategy, reliability, and operational readiness.
• A collaborative mindset — you can mentor others, give constructive feedback, and influence through clarity and example.
• Comfort operating in ambiguity and making progress when the path forward isn’t perfectly defined.
• A pragmatic approach toAI-enabled tooling — you use it to accelerate real delivery (not as a substitute for fundamentals), and you take full ownership of what ships.
• Willingness to participate in on-call rotations and support critical billing windows with calm, focused execution.
  

🔒 Trust, authenticity, and how we hire

At Pax8, we care deeply about building genuine, trust based relationships — starting with how we hire.

To protect our business, our teams, and our customers, we use a range of measures throughout the recruitment process to help confirm authenticity and prevent fraud. These safeguards are designed to be fair, respectful, and proportionate, and may evolve as risks change. By applying, you acknowledge that we take steps to verify identity and representation during hiring. If you're applying as your authentic self, you have nothing to worry about — we're excited to meet you.

We also use thoughtfully applied AI-enabled tools to support our hiring process. These tools may assist with tasks such as reviewing or prioritizing applications, but hiring decisions are made by our people. More information is available in our Recruitment Privacy Notice. If you have questions about how we hire or would prefer not to have your application supported by these tools, you can opt out at any part of our process.

🤝 Everyone belongs here

We encourage you to apply even if you don't meet 100% of the criteria. We're committed to diverse perspectives, inclusive hiring and sharing your transferrable skills. To fulfil this role, you must hold valid right to work in USA.

💙 Salary & benefits

Target base salary:$170,000 – $185,000, or more depending on experience

At Pax8 we believe that your Total Rewards should include a benefits package that shows how much we value our greatest assets. All FTE Pax8 people enjoy the following benefits:

• Non-Commissioned Bonus Plans or Variable Commission
• 401(k) plan with employer match
• Medical, Dental & Vision Insurance
• Employee Assistance Program
• Employer Paid Short & Long Term Disability, Life and AD&D Insurance
• Flexible, Open Vacation
• Paid Sick Time Off
• Extended Leave for Life events
• RTD Eco Pass (For local Colorado Employees)
• Career Development Programs
• Stock Option Eligibility
• Employee-led Resource Groups
  

📈 Growth at Pax8

There's extensive room for a talented individual to grow at pace — whether that's advancing quickly in this role or exploring one of the many opportunities across our global organization. You'll have access to our internal development hub designed to accelerate your skills and stretch your potential. Alongside specialist Learning & Development trainers, you'll also tap into AI powered tools, "born in the cloud" mentors, and cross continent collaboration that broaden your perspective and sharpen your expertise. We'll give you the space, trust, and the right projects to help you thrive — and full visibility of what it takes to reach your next level.

🌍 About Pax8

Our mission is to build the managed intelligence marketplace and empower small businesses to do more with smarter technology. We are a fast-growing, dynamic, and high-energy organization with a start-up feel, allowing you to make a meaningful impact on the business. Culture is also important to us, and at Pax8, it's business, and it IS personal. We are passionate, creative, and unconventional. We work hard, keep it fun, and expect the best! We Elev8 each other. We Advoc8 for our partners. We Innov8 continuously. We Celebr8 life.

✅ Background checks

As part of our hiring process, we are required to undertake pre-employment checks on all candidates that are successful in their application with Pax8. As part of these checks Pax8 will request ID verification, reference requests and qualification checks (additional checks may be completed for certain countries, such as criminal and financial). All checks are completed by our third-party provider, First Advantage. Once checks have been completed all candidates will receive a copy for their records.

🌈 Equal opportunities

Pax8 are an equal opportunities employer and welcome individuals who are in possession of the appropriate requirements to work within the country you have applied for. Offered individuals will be asked to undertake identity, security compliance and reference checks. Your privacy is important to us. Your data will be held in accordance with local best practices and processed only in accordance with our recruiting processes. Privacy notice:https://www.pax8.com/en-us/terms/job-applicant-privacy-notice/

At Pax8, we care deeply about building genuine, trust‑based relationships — starting with how we hire.

To protect our business, our teams, and our customers, we use a range of measures throughout the recruitment process to help confirm authenticity and prevent fraud. These safeguards are designed to be fair, respectful, and proportionate, and may evolve as risks change.
By applying, you acknowledge that we take steps to verify identity and representation during hiring. If you’re applying as your authentic self, you have nothing to worry about — we’re excited to meet you.

Perks:

Why Join Pax8?

Because here, success isn't just about numbers—it’s aboutimpact.
It’s about being part of a team thatthinks bigger, empowers each other, and never loses sight of why we do what we do: to make the cloudeasier, more accessible, and more meaningful.

At Pax8 we believe that your Total Rewards should include a benefits package that shows how much we value our greatest assets. All FTE Pax8 people enjoy the following benefits:

• Non-Commissioned Bonus Plans or Variable Commission

• 401(k) plan with employer match

• Medical, Dental & Vision Insurance

• Employee Assistance Program

• Employer Paid Short & Long Term Disability, Life and AD&D Insurance

• Flexible, Open Vacation

• Paid Sick Time Off

• Extended Leave for Life events

• RTD Eco Pass (For local Colorado Employees)

• Career Development Programs

• Stock Option Eligibility

• Employee-led Resource Groups

Please take a moment to review ourProprietary Rights and Non-Competition Agreement— this document outlines important information about your rights and responsibilities if you join our team.

Pax8 is an EEOC Employer.

Equal Opportunities

Pax8 is an equal opportunities employer and welcome individuals who are in possession of the appropriate requirements to work within the country the role is based in. Offered individuals will be asked to undertake identity, security compliance and reference checks. Your privacy is important to us. Your data will be held in accordance with Data Privacy best practices and processed only in accordance with our recruiting processes.

Job Applicant Privacy Notice