Finance Engineer

NestAI builds the adaptive operating system for modern battlefield operations. Most AI systems are built once, validated at deployment, and expected to stay sufficient after that. That assumption holds until conditions change, and in defence, they always do. Our team develops adaptive intelligence for unmanned and command systems: AI that continuously learns from operational data and adapts to changing conditions, deployed in environments where there is no internet, no GPS, and failure is not an option. NestOS, our open, modular, and interoperable platform, enables this at scale and keeps capability evolution under sovereign European control.

Founded in 2025 by Peter Sarlin, whose previous company Silo AI became Europe's largest AI acquisition, NestAI has grown to over 200 engineers and scientists and partners with leading European defence forces and industry. We're ambitious about what we're building and honest with each other. The bar is high, and so are the standards we hold ourselves to. But this is also a place built on humility, trust, and looking after each other. If that sounds like the kind of work you want to do, keep reading.

Join us as a Finance Engineer

Join our finance team and treat the finance stack as a product to build, not just operate. You will own the data, workflows, agents, and controls that move finance towards a near-real-time operating rhythm, and free the team, including the CFO, to spend their time on decisions instead of manual data work. This role suits someone with a solid finance foundation and a builder's instinct to automate a process rather than just document it.

What you'll work on

Our finance function has outgrown manual spreadsheet work and point solutions stitched together by hand. This role changes that, and you will shape how finance runs. In this role, you will:

• Own the end-to-end stack of tools, platforms, and processes that finance runs on, and make the build-versus-buy calls on what to automate in-house and what to configure from a vendor.

• Design, build, and maintain AI agents and internal tools that do finance work directly, such as variance explanations, a largely self-drafted monthly review, and forecast scenarios, so people review the work instead of doing it by hand.

• Find repetitive, manual finance workflows, such as data pulls, reconciliations, and report assembly, and automate them. If a task is done twice, write a workflow. If the workflow is run twice, turn it into an agent.

• Connect finance systems to each other and to source data, such as ERP, HR, and usage and revenue data, so numbers flow automatically instead of being reconciled across tools.

• Lead the design, scaling, and maintenance of BI infrastructure, data pipelines, and analytics platforms across all financial metrics and entity reporting.

• Build controls into every automation and agent, with a traceable path from output back to source data and approval gates before anything posts to the ledger.

• Take ownership of finance automation and AI initiatives, working with guidance from finance leadership at first and independently as you grow into the role.

What we're looking for

If your background doesn't match every requirement but the work resonates with you, we'd encourage you to apply. How you think, learn, and take ownership matters more to us than ticking every box. Here is what we are looking for:

• A finance background strong enough to understand core processes (close, AP/AR, FP&A, and reporting) and spot where the real pain points are. This is not an accountant role.

• Strong technical fluency across modern SaaS platforms, APIs, and data tools, with the ability to configure, connect, and automate systems without being a professional software engineer.

• Hands-on experience, or strong aptitude, building with AI tools such as Claude, Claude Code, custom GPTs, or agentic AI to produce working workflows, agents, or internal tools, not just prompts.

• Experience working with data using SQL and/or advanced spreadsheet logic, and reasoning about how data structures connect across systems.

• Experience shipping a small working tool quickly instead of writing a long spec, and automating a process rather than just documenting it.

• Experience explaining automated systems and their outputs to non-technical finance stakeholders, in writing and in person.

Nice to have:

• Experience in a finance engineer, analytics engineer, or BI engineer role, ideally at a high-growth tech or SaaS company.

• Experience with a modern, cloud-native ERP.

• Scripting ability in Python, Apps Script, or SQL, even without a formal engineering background.

• Experience building dashboards, semantic layers, and modern BI solutions in tools such as Looker Studio, Power BI, Streamlit, or Tableau.

Why join NestAI

• Work alongside over 200 engineers and scientists, including 60+ PhDs. People who've built AI platforms, autonomous systems, and defence technology across Europe. Most of our people say the best thing about NestAI is the people you get to work with.

• Work with real ownership. You identify what needs building, talk to the right people, and ship. Ownership here is the expectation, not a talking point.

• Work at a pace where Monday's idea can be Friday's deployment. The problems we're solving are urgent, so the culture reflects it.

• Work on systems that must operate with no connectivity, no GPS, and no margin for error. The problems we're solving are technically hard, genuinely novel, and they sit at the intersection of AI and the physical world.

• Work at a company where the platform, the practices, and the standards are all being built right now. The people here get to define how things work and how they scale.

What we offer

We offer practical benefits to support your work and wellbeing:

• The chance to participate in the NestAI Employee Stock Option Program (ESOP)

• Occupational healthcare (currently provided by Mehiläinen)

• Epassi Flex benefit for sports, culture, commuting, and wellbeing

• Lunch benefit (25% tax-free coverage)

• Mental wellbeing services via Auntie

• Holiday allowance (50% of holiday salary)

• Phone benefit (subscription and device per company policy)

• Your choice of Mac or PC

• Regular team lunches and company events

We are continuously developing our benefits offering as we grow.

Good to know

This role requires a security clearance, which is standard for defence industry positions in Finland. The process is handled by the relevant authority and typically takes two to three months. You can start working at NestAI before the clearance is finalised. We are happy to answer any questions about the process during the recruitment.

Relocation support is considered on a case-by-case basis.

Please note, we can't accept applications sent via email.

NestAI is an equal opportunity employer. We evaluate all applicants on their skills, experience, and potential, regardless of background, identity, or personal characteristics. We believe the best teams are built from diverse perspectives, and are committed to creating an environment where everyone can do meaningful work.