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About the Role

As a Senior Software Engineer on the Cards Experience EU team, you'll be a key technical contributor in building and evolving the core card spending experience within the Spend domain. You'll work alongside a team of experienced engineers across multiple European hubs, collaborating closely with staff engineers and cross-functional partners to deliver complex, high-impact initiatives in a fast-moving environment. The team is currently focused on several urgent strategic projects, and you'll play a hands-on role in driving them forward — writing production code, shaping technical designs, and helping the team execute with quality and pace. You'll contribute to the technical direction of the platform and help navigate a highly specialised domain that includes card infrastructure, banking integrations, and complex flows of funds, balancing immediate delivery needs with long-term platform sustainability and maintainability. You don't need deep prior expertise in payments or financial systems — but you'll be comfortable picking up complexity fast. Experience working in complex transactional systems will serve you well here. You'll bring strong technical judgement, a bias for pragmatic solutions, and a genuine interest in the reliability and scalability of systems that customers across Europe depend on every day.

Responsibilities

Take responsibility for the entire lifecycle of a feature, from understanding customer pains to product team involvement, design documents, coding, deployment, and measuring impact.
Shape the bigger picture by refining what to build and why, contributing to squad quarterly goals and long-term vision.
Architect for today and tomorrow by writing design documents for major platform changes, managing technical debt, and ensuring focus on impactful work.
Lead across boundaries by communicating complex ideas, identifying stakeholders, and driving alignment across the organization.
Raise the bar for everyone by mentoring colleagues, providing feedback, and modeling great engineering practices.
Support Engineering Managers in understanding team technical growth areas.
Utilize spaces like guild meetings, design doc reviews, and pairing sessions to lift the overall engineering standard.

Requirements

Experience working in complex transactional systems.
Strong technical judgment.
A bias for pragmatic solutions.
A genuine interest in the reliability and scalability of systems.
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 that account for performance, failure isolation, and long-term maintenance.
Technical Standards: Defines and upholds engineering excellence, including CI/CD optimizations, testing strategies, and coding standards across the stack.
Frontend Strategy: Establishes frontend architecture patterns, including state management, performance budgets, and comprehensive testing (e.g., E2E/Cypress).
Backend Excellence: Engineers sophisticated backend solutions involving API versioning, caching strategies, and complex data migration plans.
Operational Maturity: Leads observability and SRE practices; defines SLOs, manages incident responses, and conducts blameless post-mortems.
Security & Risk: Oversees operational security, including secrets hygiene and dependency risk management, to ensure a hardened production environment.
Mentorship & Influence: Levels up the engineering organization through active mentorship, leading design reviews, and influencing the product roadmap with technical data.
Cross-Functional Impact: Coordinates multi-team deliverables and aligns stakeholders to resolve technical blockers across the organization.
AI-Driven Development: Experience with—or a strong interest in—modern AI-augmented workflows. This includes leveraging agentic workflows, developing custom agentic skills to extend AI capabilities, utilizing AI-powered code reviews...

Skills

AI-augmented workflows
Agentic workflows
Custom agentic skills
AI-powered code reviews
CI/CD optimizations
Testing strategies
Coding standards
Frontend architecture patterns
State management
Performance budgets
E2E/Cypress testing
API versioning
Caching strategies
Data migration plans
Observability
SRE practices
SLO definition
Incident response management
Blameless post-mortems
Operational security
Secrets hygiene
Dependency risk management

Location

European hubs

Work Type

IRL-first approach
In-person 3 days a week
Relocation assistance available

Experience Level

Senior

About the Company

Perk (formerly TravelPerk) is the intelligent platform for travel and spend management.
Our tools automate travel bookings, expenses, invoice processing, and more.
We are on a mission to power real work, with real impact by eliminating shadow work.
Trusted by over 10,000 companies worldwide.
Founded in 2015, Perk has grown into a global company with over 1,800 employees across 12 offices.
Headquartered in London and Boston.
We combine innovation, control, and simplicity to transform how businesses work and how people feel at work.
Our values include being an owner, delivering a 7-star experience, and working as one team.
We value curiosity, purpose, and mindset.
Our talent team brings together leading minds from the travel and SaaS industries, representing over 70 countries.
We believe the best work happens when great people come together in small teams, with a shared sense of purpose.
AI is embedded in how we work and what we build, spanning the entire workflow from onboarding to production issue resolution.
We embrace agentic coding, using AI as an active collaborator.
We expect candidates to use AI tools in our coding interviews.
English is the official language at the office.

Equal Opportunity

We’re an equal opportunity employer, which means you’re welcome at Perk regardless of how you look, where you’re from, or anything else that makes you, well, you.