Frontend Engineer, Code Quality & Security/Greenstep Espoo

Greenstep is a Finland based, family-owned growth company founded in 2010, providing high-quality financial, HR, data & AI, technology, and sustainability services to support our clients’ development and long-term success. Today, we are a community of more than800 experts across the Nordics and Europe – and growing fast!

We are now looking for a skilled Frontend Engineer to focus on code security and quality!

The Role

We're a growing team building software that matters. As a Frontend Engineer with a focus on code quality and security,you'll work directly with our engineering team to improve and maintain a portfolio of React-based applications, many of which were built with AI-assisted development tools. You'll bring the engineering judgment that turns fast-moving prototypes into reliable, secure, production-grade software.

• Own and improveexisting React applications across the stack.

• Review and harden AI-generated code before and after production deployment.

• Identify and fix security, performance, and architecturalissues.

• Refactor andstandardizecomponent structure and state management.

• Work withPostgreSQL-backed services and understand data access patterns.

• Collaborateon deployment and config improvements in containerized environments,

• Helpestablish engineering standards for current and future projects.

You enjoy thework that happens after the prototype: hardening, refactoring, standardizing. You're comfortable raising quality concerns and proposing better approaches.You'd rather build something right than build it twice.

What we're looking for

• StrongReactandTypeScriptskills, you know modern patterns and hooks well.

• Solid understanding offrontend security (auth/authorization, CSRF, API boundaries).

• PostgreSQLexperience and a working knowledge of relational data design.

• Familiarity withTanStack Query and TanStack Router.

• Basic comfort withDockerandKubernetesdeployments.

• Someone who takes "it works" seriously and knows that's not enough on its own.

Nice to have:

You have experience working with Fastify or anotherNode.js-based backend. You also have hands-on experience with AI-assisted development tools, such as Lovable, Claude Code, or similar solutions. In addition, a background in building or working withSaaS productsis a plus.

Why Greenstep?

Greenstep Oy is a family-owned company founded in 2010 with no loans and a strong balance sheet.Since 2010, we have grown to almost 800 people, more than 3000 customers, and we are looking forward to continuing this growth journey!We provide the full spectrum of financial services, from accounting to interim CFOs for some of the fastest growing companies in Finland as well as all over the Nordics. Everyone works closely together, meaningyou will be working with other CFO’s, Accountants, Payroll Specialists, HR specialists, Systems and Integrations Specialists, but most importantly, with great customers.Besides our consulting services, we already have a large, established tech team with over a hundred people who use programming languages for working with data.

With us, you will be part of a work community where expertise, responsibility, and caring for others are visible.

💚 Support for yourwell-being.For us, everyone's well-being and well-being at work are top priorities. Our occupational health is comprehensive, and our offices are ergonomically designed. The Flex benefit and lunch discount offered through Epassi are available to you. However, the number one thing that supports your well-being at work is a sustainably built resource budget.

💚 Asalary modelthat matches your responsibilities and experience. All Greenstep employees are also included in ourTogether bonus,through which we share 10% of the annual operating profit among all employees, regardless of role.

💚 Support and time fordevelopmentand strengthening your skills. At Greenstep, continuous learning is at the core of what we do. Our own Greenstep Academy offers training in various topics almost weekly!

💚 Career opportunities in a growingfamily-owned company. We grow organically primarily with a few small exceptions where the culture has been 100% on par with ours. Because, we want to grow in a controlled manner, profitably and without compromising on quality. For us, growth means new opportunities: we can make a more positive impact on society, create new jobs, invest in the development and skills of our personnel, and enable business continuity. Our culture has developed together over the years, and our values are reflected in our everyday work.

Interested?

We have more than fifteen offices in Finland and you can find Greenstep also in Estonia, Sweden, Norway, Denmark and Netherlands.This role is in Espoo.With our hybrid work model, we are at least 50% of the work time at the office with our colleagues. 

We look forward to receiving your application! We process applications already during the application period but be sure to applylatest by 21.6.2026.

We can't wait to hear from you!