Senior Software Engineer

3 days ago

Helsinki, Uusimaa, Finland Vainu Full time €66,000 - €84,000
Senior Software Engineer

Vainu is a Nordic company data platform that turns data into reliable actions for AI and humans. We provide sales, marketing, and data teams with the reliable foundation they need for timely and confident decision-making, powered by official-source data and real-time events.

We are a team of 80 people across Finland and Sweden, with most of our 15-person in-house engineering team based in Helsinki.

We are looking for a skilled Senior Software Engineer to take full ownership of Vainu's frontend product development.

Here are some of our Customer Cases and a short video on the Vainu Platform.

Key Details

Role: Senior Software Engineer, fluent in React & TypeScript

Location: Hakaniemi, Helsinki, Finland

Work Model: Flexible Hybrid, working at the Helsinki office is required 1 day per week, during the onboarding period more often (3–4 days per week).

Compensation (Gross, Annual): €66,000–€84,000 based on experience and seniority

Ownership of Vainu's Front-End

This is a highly autonomous role where you define the standards, not just follow them. Your primary goal is to own the architectural health and quality of our front-end.

Long-Term Product Vision: You have the freedom to make key technical decisions (mostly React/TypeScript) to ensure we build a long-lasting and maintainable product. You set the technical path for our UI.

The Quality Champion: Proactively manage technical debt and ensure consistency. Deliver reliable, bug-free implementations on schedule. You must be comfortable setting standards and resisting unnecessary quick fixes to protect the product's future.

Design & UX Leadership: Our product is data-heavy. You'll tackle complex UX challenges, championing consistency and scalability to find the best ways to present increasing amounts of data.

What Makes You a Senior at Vainu?

For us, being a Senior is about impact and accountability, not just years of experience.

You Take Ownership: You treat the project as yours. If you notice technical debt or inconsistency, you treat it as your problem to solve and actively address it.

You See the Big Picture: You prioritize technical work that delivers the biggest value, understanding the broader product context rather than endlessly polishing minor details.

Risk Detector: You spot potential bottlenecks (e.g., technical, security, or maintenance issues) before they become serious problems and proactively bring forward ideas and solutions.

Team Player: You are approachable, easy to talk to, and great at collaborating with back-end engineers and product managers, explaining complex technical choices clearly.

The Tech Stack

This role requires solid expertise in the modern React ecosystem:

Core Tech: Excellent knowledge of React and TypeScript.

Ecosystem: Proficiency with state managers (like Jotai, React Context, or similar) and UI libraries (like MUI).

Quality: Experience across the testing pyramid, especially component and integration testing (e.g., Jest, MSW).

Performance & Security: Strong understanding of web performance optimization and security best practices.

Tooling & Collaboration: Familiarity with modern front-end tooling (Vite, ESLint, GitLab CI) and collaboration tools like Figma and Storybook.

The Process

Ready to take ownership of our front-end? Here's what comes next:

  1. HR Screening Call

  2. Online Interview with the Hiring Manager

  3. Technical Live Coding Exercise (Preferably at the Helsinki office, also a great chance to meet the team)

  4. Reference Calls

  5. Decision

Questions? Pauliina from Vainu's HR is happy to help:  or

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