Senior Software Engineer (Accounting/Payments) - ServiceCore

About the Role

builds the software that runs the portable sanitation and liquid waste industry — a niche most people have never thought about but that keeps job sites, events, and communities operational. Our customers rely on us daily, and the Senior Software Engineer owns the technical quality of what we ship: designing systems, guiding architectural decisions, and driving down the technical debt that would otherwise slow us down.

You'll work as the technical anchor of a small, cross-functional pod of 2–3 engineers focused on accounting and payments, partnering closely with Product and Design. You'll mentor SE1s and SE2s, participate in customer discovery to keep your work grounded in real problems, and hold the line on quality through thoughtful code review and a strong testing strategy.

This pod owns two of our biggest bets right now: migrating batch billing processing onto Go worker routines, and transforming our invoicing experience into a reusable SDK with Storybook. There's also room to take on scheduling and routing map work if that's where your interests pull you.

Our stack is Angular & TypeScript (frontend), PHP/Laminas Framework (API), Go (payment processing services), MySQL, AWS, and React Native (legacy Ionic) for mobile. We work fully remote, come together once a year as a company, and do quarterly planning as a team. If you're near Denver, CO, a hybrid option is available.

What You'll Do

• Architect features and systems end-to-end — from data model through API through UI — and own the implementation quality across your pod.
• Lead the migration of payment processing to Go worker routines: design the concurrency model, the failure and retry semantics, and the cutover plan.
• Drive the invoicing SDK effort — decompose the existing invoicing experience into well-documented, independently testable components in Storybook, and define the API surface other teams will build on.
• Define and champion the testing strategy for your team: what to test, how to test it, and how to keep the suite maintainable over time — with the correctness bar that money movement demands. Identify and address technical debt proactively — propose the tradeoffs clearly, get alignment, and execute.
• Mentor SE1s and SE2s through code review, pairing, and direct feedback; raise the technical bar of your team without being a bottleneck.
• Participate in customer discovery with Product to ensure your technical decisions are solving real problems, not imagined ones.
• Lead AI-assisted development practices on your team — Claude is our preferred tool, and we expect you to use agentic workflows to increase throughput and help your teammates do the same.

What We're Looking For

5+ years of professional software engineering experience, with clear ownership of complex, production systems. Strong command of backend development (PHP, Go, Java, or similar) and relational databases (MySQL/MariaDB preferred). Experience writing Go, or a track record of picking up a new language quickly and going deep — you'll be shaping how we use it. Solid frontend experience with a modern framework — Angular preferred, React or Vue considered. Experience building reusable components or shared libraries other teams consume — Storybook or a similar component workshop is a plus. Hands-on experience with AI-assisted development tools (Claude preferred; Cursor, GitHub Copilot, or similar) as a real part of your workflow, not an experiment. Demonstrable ability to architect systems: you've made hard technical decisions, documented them, and stood behind them when questioned. Track record of mentoring more junior engineers and improving the team around you, not just your own output. Comfort operating in a product-led environment — you engage with the 'why' behind features, not just the spec.

Bonus points for:

Experience with payments, billing, invoicing, or accounting systems — payment processors, reconciliation, ledgers, or tax Production experience with Go concurrency — goroutines, channels, worker pools Experience in B2B SaaS, field service, or operational software Scheduling, routing, or mapping/geospatial experience Familiarity with Ionic or mobile development AWS experience (Lambda, RDS, S3, etc.) Experience with agentic AI workflows or building LLM-powered tooling

Who Thrives Here

's values are: Love Our Customers, Give a Shit, Deliver Results, Be Real, and Keep It Fun. Senior engineers who do well here care about the craft without being precious about it. They're willing to dig into unglamorous problems because the customer impact is real. They give direct feedback, take ownership without waiting for permission and make the people around them better. If you want to be the smartest person in the room and protect that status, this isn't the right fit. If you want to do meaningful work, build things that matter, and have a good time doing it — let's talk.

Work Environment & Benefits

• For Denver HQ: Tuesdays and Wednesday in office for local employees (free parking!)
• Casual, collaborative culture with direct access to leadership and an open-office environment
• Company-provided hardware of your choice/configuration
• 14 Company Holidays + Unlimited PTO
• Healthcare, dental, and vision insurance with generous employer contributions
• 401(k) with company match
• Regular team events and company bashes
• Weekly lunches and a fully-stocked kitchen (if in Denver)
• Bi-weekly Grubhub lunch stipend for remote employees
• A Strong Company Culture that Lives by Our Core Values - Love our Customers, Be Real, Give a Shit, Deliver Results, and Keep it Fun.

Ready to Apply?

If you believe you match the above criteria and are desiring a dynamic start-up environment with a management team that is dedicated to your success, then please apply!

In addition to our commitment to equal pay for equal work, is also committed to equal opportunity regardless of race, color, age, ancestry, religion, gender, gender identity, genetic information, parental or pregnancy status, sexual orientation, marital status, citizenship, national origin, disability, or veteran status.

Salary: $125K - $165K (DOE)