Senior Software Engineer, Accounting

We are looking for a highly experienced Senior Software Engineer to join our Accounting squad, with the role open in London, Paris or Barcelona.

You will help shape the technical direction of the squad, lead complex initiatives and contribute to building reliable financial systems that support accurate bookkeeping and month-end close.

The Accounting squad is responsible for making sure that spend data is correctly prepared, enriched, coded and reconciled before it reaches accounting systems. We build the workflows and automations that turn complex financial operations into reliable, traceable and efficient processes for finance teams.

You will work closely with Product, Design, Accounting specialists and other Engineering teams to solve complex domain problems and deliver robust systems. You will be expected to contribute beyond implementation by shaping architecture, clarifying technical trade-offs, raising engineering standards and helping the squad make sound long-term decisions.

Our stack

• TypeScript

• Node.js for backend and banking applications

• React on the frontend

• PostgreSQL for data storage; Redis, SQS, and Kafka for jobs and queues

• Terraform to define our infrastructure

• Kubernetes, Lambdas, and Step Functions to run our applications

• AWS as our cloud provider

• GitHub Actions for CI

Key Responsibilities

• Lead the design and development of reliable systems for bookkeeping preparation, payables and payment workflows.

• Build rules-based automation for payable and expense coding.

• Improve how spend data is enriched, classified, validated and reconciled.

• Contribute to supplier and receipt management capabilities.

• Build clear accounting visibility and auditability for Finance teams.

• Design robust workflows that handle complex financial rules, exceptions and reconciliation scenarios.

• Define and evolve scalable architectures, domain boundaries and integration patterns.

• Own technical initiatives from discovery and architecture through implementation, production rollout and continuous improvement.

• Make pragmatic decisions around data consistency, reliability, observability and maintainability.

• Work closely with Product, Design, Accounting and Operations stakeholders to translate complex business requirements into effective solutions.

• Provide technical guidance and mentorship to other engineers.

• Help shape engineering practices, architectural standards and the technical roadmap of the squad.

• Use AI-assisted development tools responsibly and help the team adopt effective engineering workflows.

Why join Accounting?

• Work on a critical product area where correctness, reliability and traceability directly matter to customers.

• Solve complex problems at the intersection of software engineering, finance and accounting.

• Build systems that support the full journey from company spend to accurate bookkeeping and financial close.

• Work on automation, reconciliation and financial data quality at scale.

• Have a direct impact on how Finance teams save time, reduce manual work and trust their financial data.

• Operate with a high level of autonomy and help shape the technical direction of the squad.

• Contribute at a level close to Tech Lead or Staff Engineer, while remaining hands-on.

• Collaborate with domain experts and influence product and architectural decisions across the organisation.

What we're looking for

• Fluency in written and spoken English (our business language)

• Significant professional experience building and operating production software, ideally in a product-focused environment.

• Strong expertise in TypeScript, particularly backend development with Node.js.

• A proven track record of designing and delivering reliable, scalable and maintainable systems.

• Strong architectural knowledge, including experience with microservices, domain modelling, event-driven systems and data consistency.

• Experience leading complex technical initiatives from discovery through production.

• The ability to make sound technical decisions and communicate trade-offs clearly with both technical and non-technical stakeholders.

• A high degree of autonomy, ownership and influence beyond direct implementation.

• Experience mentoring engineers and raising engineering standards within a team or organisation.

• A strong product mindset and the ability to understand complex business and financial workflows.

As we are an international team, please submit your application and CV in English.

About Spendesk Spendesk is the AI-powered spend management and procurement platform that transforms company spending. By simplifying procurement, payment cards, expense management, invoice processing, and accounting automation, Spendesk sets the new standard for spending at work. Its single, intelligent solution makes efficient spending easy for employees and gives finance leaders the full visibility and control they need across all company spend, even in multi-entity structures. Trusted by thousands of companies, Spendesk supports over 200,000 users across brands such as SoundCloud, Gousto, SumUp, and Bloom & Wild. With offices in the United Kingdom, France, Spain and Germany, Spendesk also puts community at the heart of its mission.

For more information: www.spendesk.com/press

About our people & culture We believe that people do their best work when they’re given the freedom to thrive and grow. That’s why liberation is at the core of everything we do. We empower Spendeskers to take ownership of their work, to navigate ambiguity, and seize every opportunity. Spendeskers come from all over the world (35+ countries and counting!) but we have plenty in common: we're bold, ever-curious, committed to kindness, and tackle every challenge with a positive mindset.

About our benefits Our culture is built on trust, empowerment, and growth — with benefits to match!

• Flexible on-site and remote policy

• Access to Moka.care for emotional and mental health wellbeing

• Latest Apple equipment

• Great office snacks to fuel your day

• A positive team to work with daily!

Diversity & Inclusion

At Spendesk, we're committed to fostering an environment where all differences are encouraged, supported and celebrated. We're building our culture for everyone, with everyone. Our goal is to attract and build a diverse, equal and inclusive team, where everyone feels welcome and we truly embrace and encourage people from all backgrounds to apply.