Siili is at the forefront of AI-powered development. Here, you will collaborate with AI-assisted developers and designers on projects that go beyond proof-of-concept, delivering real-world impact and innovation. AI represents the next revolution, and Siili is ready to lead the charge in digital development, making the most of the transformative power of AI.

Interested in becoming a Senior Full Stack Developer at Siili?

We are looking for an experienced Senior Full Stack Developer to join our long-running engagements in the financial technology domain. You will become part of a hybrid team of seasoned siilis delivering secure and scalable digital services with modern cloud-native approaches. In this role, you will be employed in open client projects within the financial sector. This role requires some on-site presence in Helsinki. Our company culture supports hybrid work, offering flexibility while encouraging collaboration and connection.

In your role, you will focus on developing backend-heavy solutions that are central to critical business processes. The work includes building APIs, designing integrations, containerizing applications, and ensuring observability and stability through DevOps practices.

We work in agile DevOps teams that value collaboration and continuous improvement. Your role can evolve based on your interests – whether it’s deeper into cloud architecture, DevOps automation or taking a lead developer’s path. We appreciate a hands-on, proactive mindset – but you’ll always be supported by your team and our wider community.

Are you the next new Siili?

We are looking for professionals with 7+ years of experience in software development and cloud platforms, who enjoy solving complex problems and building real-world solutions. 

To succeed in this role:

• Strong hands-on experience in Java and Spring Boot (+5 years)

• Experience with Ruby on Rails, React and Kotlin

• Proficiency with AWS and/or Azure, including container-based development (Docker, Kubernetes)

• Familiarity with DevOps mindset and tooling, such as CI/CD pipelines, monitoring, and IaC

• API development and integration know-how (REST, Kafka, Apigee)

• Understanding of databases like PostgreSQL, SQL Server, MySQL or DB2

• Experience working in agile teams with tools like Jira and Confluence

• Working proficiency in Finnish and English is required

Additionally, it’s beneficial if you have:

• Experience with Node.js

• Knowledge of observability tools (Dynatrace, Splunk, Loadrunner)

• Experience with AI tools and cloud certifications

• Previous experience working in the financial sector

Why Siili?

We provide a culture and environment with Joy, Ambition and Humane touch. That means that we continuously organize different kind of activities and gatherings, strive to enable exciting project with learning opportunities and regularly create an environment that is inclusive and psychologically safe for everyone to express themselves.

You will have the opportunity to work with the best colleagues (siilis) on interesting client projects. You will never be bored: we believe in continuous growth, meaning you can always deepen your expertise alongside our experts. Being a Siili means you get to work in diverse teams while still managing your own work – we trust you!

We also offer an extensive range of great benefits, including healthcare, flexible working hours, in-house coaching, the SiiliX Share program, an employee bike benefit, and company-sponsored massage sessions.

As mentioned, Siili is at the forefront of AI-powered development, and we’re invested to develop all Siilis skills with different paths of AI learnings and certificates. With us you can be sure to grow to a skilled AI assisted software developer rather sooner than later!

Shall we get to know each other better?

At Siili, we don’t conduct interviews; we have meetings. These meetings ensure that both our goals and expectations are aligned, laying the foundation for a promising future together.

We welcome applicants from diverse backgrounds, including different ages, genders, cultures, and minority groups.

Please let us know if we can adapt our meeting to suit your needs. We strive to consider individual needs and neurodiversity in our recruitment process, making meetings as comfortable as possible for everyone.

Got excited?

If you like what you read and feel that you’re the one we are looking for, just click the apply button and fill in a few details on the application form on Siili's website by the latest 6.7.2025. Looking forward to hearing from you!

WE MAKE IT REAL