Job Description

Want to build the integration platform that becomes a key growth engine for a fast-growing SaaS company? Operating is looking for a Senior Integration Engineer to take ownership of one of the most business-critical areas of our product: integrations.

The role

Operating helps consultancies run their business, from staffing and time tracking to billing and month-end close. As our customer base grows, integrations have become a key factor in winning new business. Every new customer brings new systems, new requirements, and new opportunities to expand our platform.

In this role, you'll take ownership of our integration domain and help shape how Operating connects with the broader SaaS ecosystem. We already have several integrations in production and the foundations of an integration framework in place. Your mission is to turn that foundation into a scalable platform that makes future integrations faster to build, easier to maintain, and more reliable for customers.

This is a highly hands-on engineering role. You'll spend most of your time designing and building integrations, improving the underlying platform, and making technical decisions that directly impact our product and growth. You'll work closely with our CTO, founders, product stakeholders, and development team, while occasionally participating in customer and partner discussions when needed.

Key responsibilities include:

• Designing and building scalable integrations between Operating and third-party SaaS platforms
• Developing the underlying integration framework and platform architecture
• Owning the technical direction of the integration domain
• Building connectors for systems such as ERP, HRIS, payroll, CRM, finance, and expense management platforms
• Collaborating with customers, integration partners, and internal stakeholders to define integration requirements

Our tech

The backend is a TypeScript modular monolith running on AWS, with Postgres as the source of truth. The frontend is React with tRPC, Tailwind, and shadcn — types flow end to end. The product integrates with the tools our customers already live in (CRMs, HRIS, accounting), and exposes a REST API alongside an MCP server for AI clients.

Test coverage is strong but pragmatic — we test what earns its keep, not for a 100% number. AI tools are available to every engineer, and everyone uses them day to day. We deploy continuously, and every PR gets reviewed before it lands.

What makes you a great fit?

You're an experienced software developer who has built integrations in production environments and understands the challenges that come with connecting complex business systems. You enjoy taking ownership, making pragmatic technical decisions, and turning ambiguous requirements into working solutions. Most importantly, you're excited about joining a small startup where your work has an immediate impact on customers, product direction, and company growth.

You are expected to have:

• Strong experience designing and building software integrations in production environments
• Experience working with business-critical SaaS systems such as ERP, HR, payroll, finance, CRM, or similar platforms
• Solid understanding of APIs, authentication mechanisms, data synchronization, and integration patterns
• Strong analytical and conceptual thinking, combined with the ability to independently drive technical initiatives
• A full working proficiency in English for day-to-day collaboration (Finnish skills are a plus)

Bonus points if you have experience with:

• TypeScript, Node.js, JavaScript, PostgreSQL, or AWS
• Multi-tenant SaaS architectures
• Experience building integration platforms, frameworks, or reusable integration tooling
• Previous experience in B2B SaaS product companies
• Experience working directly with customers or integration partners
• Finnish language skills

Why you’ll love it here

• You'll own a business-critical part of the product and have a direct impact on both customer success and company growth
• You'll build and shape our integration platform, creating solutions that customers start using right away
• You'll have the opportunity to influence technical direction, take ownership, and grow alongside the company as the team expands
• Low-hierarchy, high-trust culture
• We’re a kind, pragmatic, no-drama team
• Customers love the product — and we talk to them often

Practicalities:
This is a full-time and permanent position with a preferred start date as soon as possible, and you will be employed directly by Operating Solutions Oy. The role is based in Helsinki with a primary focus on working from the office while allowing flexibility for remote work when it makes sense. Salary in this position is approximately 5500-6500 €/month depending on your experience. In addition, you’ll be offered an employee option program, comprehensive occupational healthcare, and everyday benefits including a paid moving day, and gym access.

Interested?

Please submit your CV and motivation letter in PDF format in English by the latest 15th of June. Remember to use the application system; we do not accept applications by email. We want to ensure that all applicants can participate in the process equally, and we will take individual accessibility needs into account where necessary.

Learn about Operating here and the team members here. For more information about the position and recruitment process, please contact aTalent’s Senior Recruitment Consultant Tittamari Bilund (0505513395, tittamari.bilund@atalent.fi). If I’m unable to answer your call right away, please leave a text message, and I’ll get back to you as soon as possible.