Senior Software Engineer

About the Position

We are looking for a Senior Software Engineer to join our Engineering team in Sofia. This is a full-time position.

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The Role, in One Line

You will take entire, highly complex features from idea to production across a multi-service, multi-technology product, and help shape how the team builds it.

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Responsibilities

• Lead the build of new product features and maintain existing ones, driving impactful engineering initiatives and owning end-to-end delivery.
• Work across the full software development lifecycle: frontend, backend, testing, deployment, and LLM-based functionality where applicable.
• Contribute to the architecture, and propose scalable, sustainable solutions.
• Work with product managers and designers to capture requirements and build a strong business perspective on the features you implement.
• Break complex, ambiguous problems into well-scoped, clearly defined tasks that align with product and technical goals.
• Write scalable, high-performance, maintainable code, with testability, coverage, continuous integration, and backward compatibility built in.
• Own feature delivery from discovery through deployment and monitoring. Address blockers and risks proactively, with minimal supervision.
• Mentor and support other engineers through knowledge sharing, constructive feedback, and code reviews.
• Work across teams to remove dependencies, build alignment, and make sure your team's work fits the broader technical direction.

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Requirements

Must-have

• Advanced programming experience and in-depth knowledge of Node.js, TypeScript, PostgreSQL, Kubernetes, Docker, Google Cloud, React, React Native, and Apache Kafka.
• A Bachelor's degree in Computer Science or a related field.
• 6+ years of relevant work experience.
• Experience with agile processes, continuous delivery, and continuous integration.
• The ability to multitask and organize your work.
• The ability to prioritize.
• Strong integrity and work ethic.

Nice-to-have

• Experience with LLMs, AI-driven architectures, and autonomous agents.
• Experience with vector databases, embedding models, and MLOps practices.

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We Offer

• Recharge properly - 30 days of paid holiday
• Change the view - a week-long exchange to London, Amsterdam, Paris, Munich, Vilnius, Berlin, Sofia, or Barcelona
• Win together, celebrate together - regular team-wide events that are actually worth showing up to
• Covered, properly - additional medical care
• Stay in the game - a sports card, fully funded, for the gym, classes, or your sport of choice
• Commute easily - a monthly travel allowance that covers getting to and from the office
• Use what you build - hands-on access to the actual product you're hiring people to help build

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About the Company

Payhawk is one AI-powered spend management platform for scaling businesses - corporate cards, expense management, procurement, and accounts payable, unified in one place. We serve finance teams across 32+ countries, cutting month-end close time and reconciling 99.7% of transactions with zero manual touch. AI runs through the platform as core infrastructure, not a bolted-on feature - and we hire the top 1% of talent in every function to keep building it that way.

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Why Payhawk

Payhawk, where the bold builders make an impact.

We're not a family, we're a high-performance team - and that's deliberate. We debate, ideate, and push each other to be better, because the best ideas come from direct feedback. We've already made history as Bulgaria's first unicorn, but the ambition doesn't stop there: if you want to grow fast - own it; do not wait for it.

Give: Honest opinions, real ownership, a focus on outcomes.

Get: A front-row seat to a market leader in one of the fastest-moving industries.

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Payhawk is an Equal Employment Opportunity Employer. Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, or disability status.