Senior Software Engineer - Finance Experience in Edinburgh

As a Senior Software Engineer on the Finance Experience team, you'll play a central role in delivering the systems that power seamless, automated expense reconciliation for Perk clients. The team's mission is ambitious: to reconcile 100% of travel expense data for every client through a fully automated, accurate, and effortless accounting experience - eliminating manual effort for finance teams.

You'll work across the full stack on features spanning employee reimbursements, expense capture, ERP integrations, supplier invoicing, and integrations with third‑party expense platforms like Pleo and Ramp. Through close partnership with finance, compliance, and cross‑functional engineering teams, you'll help ensure that every step in the financial reconciliation journey works seamlessly.

At Perk, we know that we feel most fulfilled when we can own the problem and the solution. This means taking responsibility for the entire lifecycle of a feature, from understanding customer pains with the product team, design documents, coding to deployment, and measuring impact. You will see how your technical decisions move the needle for our customers daily.

We prioritize autonomy and pragmatism, giving you the space to solve complex problems without unnecessary friction. Engineering excellence here is measured by the reliability and simplicity of the systems you build to power a global platform.

At Perk, we believe the best work happens when great people come together in small teams, with a shared sense of purpose. You'll join a cross‑functional squad where you have real ownership of a piece of Perk’s domains, a genuine say in what gets built, and the autonomy to make it happen. Each team decides how to contribute to Perk’s company goals. We care about impact, and we trust our people to deliver it.

AI is embedded in how we work and what we build. On the engineering side, it spans the whole workflow: our Notion, Jira, GitHub and Slack are AI‑connected so you get up to speed fast, and day‑to‑day it helps with specifying features, writing and reviewing code, and automated AI PR review on every pull request. When something goes wrong in production, AI surfaces context across systems quickly. We also embrace agentic coding, using AI as an active collaborator, not just a prompt‑by‑prompt co‑pilot.

We expect candidates to use AI tools in our coding interviews. The bar is understanding your code and owning what you produce. That reflects how we work every day.

Some examples of what it means to be a Senior at Perk:

• Shape the bigger picture. You won't just build features, you'll refine what to build and why. At Perk, senior engineers are expected to go beyond the technical solution and focus on the problem itself. You'll contribute to your squad’s quarterly goals and long‑term vision alongside your Product Manager and Engineering Manager.
• Architect for today and tomorrow. When a big change is needed in how our platform works, you'll write the design documents that lay the foundation. You'll become a guardian of your team's technical quality; spotting areas of investment, proactively managing technical debt, and making sure we don't let busy work crowd out the work that truly matters.
• Lead across boundaries. Your influence won't stop at your own squad. You'll communicate complex ideas across multiple teams, proactively identify who needs to be involved, and drive alignment across the broader organisation.
• Raise the bar for everyone around you. Senior engineers at Perk are mentors, coaches, and bar raisers. You'll support less experienced colleagues through direct mentorship, thoughtful feedback during reviews, and by modelling what great engineering looks like in practice.

Desired skills and experience:

• Product Leadership: Translates complex business goals into technical roadmaps; de‑risks ambiguous projects through spikes and prototyping.
• System Architecture: Architects scalable, evolvable systems and data models.