Senior Backend Software Engineer

Senior Software Engineer (Backend) Helsinki Product About the job Location: Erottaja, Helsinki, Finland On-site: 3 days/week — this role is based out of our Helsinki office and is only open to candidates with an existing right to work in Finland. We are not able to offer relocation support or visa sponsorship for this position. Reports to: CPO About Zevoy We are a fast-growing, regulated fintech (EMI) reshaping corporate expense management. We process real-time transaction data across 13 European markets, turning the chaos of corporate spending, receipts, and accounting into a seamless, automated flow. Our platform combines smart Visa payment cards, an intuitive mobile app, and a robust backend that integrates deeply with European banking and accounting systems. We are one of Finland's top 100 fastest-growing companies because we build pragmatic, high-quality tech that solves real pain points for our users. Why this role matters Our ability to integrate flawlessly with our clients' accounting and banking systems is one of the biggest levers we have for growth. Every new integration you build or harden can unlock an entire wave of clients in a market we couldn't previously serve well — you'll be the engineer who makes that expansion technically possible. The Role We are looking for a Senior Backend Engineer to take ownership of the systems that move real money for thousands of businesses across Europe. In a world where the "how" of writing code is increasingly accelerated by AI, your greatest asset is understanding the "why" — the business domain, the failure modes, and the architectural tradeoffs that matter when you're handling financial data at scale. This is a backend-first role. You'll work closely with frontend and mobile engineers who consume your APIs, but your core job is designing, building, and hardening the services underneath — not shipping UI. Key Responsibilities End-to-End System Ownership: Drive backend features from architecture design through deployment and production monitoring. You care about how your code behaves under real transaction load, not just locally. Deep Integration Ownership: Take full accountability for developing, maintaining, and scaling our core accounting and banking integrations — from modern REST/OAuth2 APIs to legacy SFTP/SOAP/XML/CSV data flows. New Market Entry: As we expand geographically across Europe, lead the technical work of building the integrations that make each new market possible. Pragmatic Problem Solving: You know that understanding the problem is 80% of the work. You're comfortable working directly with business owners to slice complex projects into shippable, high-value increments. Balance Velocity with System Health: You maintain standards while shipping — paying down technical debt, hardening test coverage, and keeping observability sharp (metrics, tracing, alerting). Our stack: Go, GraphQL and REST APIs, event-driven serverless infrastructure on AWS (EventBridge, Lambda), with daily deployments and a modern CI/CD pipeline. Equivalent experience on Azure or GCP transfers directly. What You Bring Must-Haves: 5+ years of professional backend engineering experience, with strong command of Go (or a comparable statically-typed backend language) and solid SQL/relational database fundamentals. A track record of owning production systems end-to-end — design, deployment, incident response, and the operational maturity that comes with it. Hands-on experience integrating with third-party systems, ideally involving financial or accounting data — this is core to what we build, not a side skill. Comfort with event-driven, cloud-native infrastructure. We run serverless architecture on AWS; equivalent experience on Azure or GCP transfers directly. An AI-augmented workflow. You already use tools like Cursor or similar to multiply your output, and you understand AI handles the boilerplate while you own the architecture and the prompt context. Product-minded ownership. You don't just close tickets — you validate that what you ship is secure, scalable, and actually solves the problem. Excellent spoken and written English. Able to commit to on-site work 3 days/week. We cannot support relocation or visa sponsorship for this role. Nice-to-Haves: Frontend exposure (React, TypeScript, GraphQL) — useful but not required for this role. Previous experience in expense management, payments, or fintech more broadly. Experience in startup or scale-up environments. Third-party integration experience spanning both modern APIs (REST/OAuth2) and legacy data transfer patterns (SFTP, SOAP, XML/CSV parsing). Familiarity with financial data patterns — double-entry bookkeeping, localized VAT/tax rules, or standardized payment file generation (e.g. SEPA). What We Offer Direct, High-Scale Impact: Your code directly simplifies the financial workflows of thousands of users across 13 European markets. We value shipping real, pragmatic solutions over endless meetings. Transparent Compensation & Top-Tier Gear: A competitive monthly salary based on experience, plus the hardware and premium AI tooling you need to do your best work. Entrepreneurial Culture: An informal, professional, international team that supports autonomous decision-making. Prime Location & Team Connection: A dedicated desk at our brand-new office in Erottaja, Helsinki. How to Apply Apply through our careers site: https://zevoyaktiebolag.careers.haileyhr.app/ We review applications as they arrive. Contact personMelinda Holmén Application Contact informationFirst name * Last name * Email * Phone * ApplicationCV *Click here to upload PDF Please summarise briefly in 3-5 bullet points what makes you our ideal candidate? (which of the must have's do you have and from where did you get them?) * Please write shortly in one sentence your reason for applying * Are you currently living in Finland with an existing right to work in Finland? *YesNo Approximate expected salary range * Are you able and keen to work 3 days per week onsite at our central Helsinki office *YesNo Submit application By applying for this position, your data will be processed as per Hailey HRPrivacy Policy