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Janne Hellsten

Janne Hellsten

Software Developer

Developer with a broad perspective — from hands-on coding to leading teams.

About Me

A developer who sees the bigger picture

Developer workspace with code editor and monitors

CTO

Leadership Experience

ITIL4

ITIL4 Certification

CSM

Certified Scrum Master

CSM

Certified Product Owner

I came to software development from an unusual direction. Before writing code professionally, I spent a decade as a bike mechanic and in retail, worked on a cargo ship, drove trucks, and spent time on construction sites. That hands-on background shapes how I approach software — I care about what actually works for the people using it, not just what's technically elegant.

While still in retail I studied for a business degree, which eventually helped push me toward tech. Once I made the switch I went back to school again — graduating with a Bachelor's in Information Technology from Haaga-Helia University of Applied Sciences in 2022, while already working as a developer.

My core expertise is Node.js and backend development, though I'm equally comfortable building polished interfaces with React and React Native. I'm a strong believer in TypeScript for maintainable, scalable code, and PostgreSQL is where I do some of my best work — I have a particular fondness for complex queries and getting the data layer exactly right.

I've also served as a CTO, overseeing software development, project management, process improvement, hiring, and supporting sales through project estimation. That experience taught me that good software is as much about people and process as it is about code — and I'm most in my element where those two worlds meet.

Node.jsTypeScriptReactReact NativePostgreSQLTeam Leadership
Skills & Expertise

Tools of the trade

A versatile toolkit built through years of hands-on development and technical leadership.

Languages & Frameworks

Core technologies I work with daily

Node.jsTypeScriptReactNext.jsExpressiOS/Android Development

Databases

Data layer expertise

PostgreSQLQuery OptimizationSchema DesignData Modeling

Strengths

What I bring to every team

Full-stack DevelopmentBackend ArchitectureTeam LeadershipProject EstimationImproving Workflows

Certifications

Professional credentials

Certified Scrum Master (CSM)Certified Product Owner (CSPO)ITIL4Haaga-Helia PRO
Experience

Where I've worked

A journey through consulting, product development, and technical leadership.

Reaktor

Software Developer

Aug 2023 -- Present

Building high-quality software solutions for diverse clients at one of the Nordic region's most respected technology consultancies. Focused on delivering robust, scalable applications with modern technologies.

Node.jsTypeScriptReact

Dashboa

Lead Developer

Aug 2021 -- Aug 2023

Led the development team in building and scaling the product platform. Focused on getting the best out of the team and building valuable features for clients.

LeadershipArchitectureFull-stack

Vertics

CTO

Mar 2020 -- Jul 2021

Oversaw software development, project management, process improvements, HR, recruiting, and supported sales through project estimation. Built a healthy company culture focused on learning and growing together.

CTOProject ManagementTeam Building

Vertics

Full Stack Developer

Sep 2018 -- Mar 2020

Built web applications and services across the full stack, working closely with clients to deliver tailored solutions. Grew into a leadership role through hands-on contribution and initiative.

Node.jsReactFull-stack

Velo & Oxygen FI

Bike Mechanic & Webmaster

Jan 2015 -- Aug 2018

Worked as a bike mechanic while also managing the company's web presence. Before tech, I also worked on a cargo ship, drove trucks and semis, and spent time on construction sites — experiences that shaped my practical, hands-on approach to problem solving.

RetailWebHands-on
Recommendations

What colleagues say

Kind words from people I've had the pleasure of working with.

From LinkedIn recommendations

Janne is the best manager who I have ever worked with!

I had a chance to work with Janne for over 2 years and the way how he managed the team and resources have impressed me a lot. His ability to work through the crisis and develop new ways to achieve the targets were always inspiring.

Under his instructions, I gained a variety of skills that help me in every aspect of software development and especially in dealing with relationships. He has expertise and knowledge in the field, and the way he handles the clients is genuinely remarkable.

I recommend Janne as a senior/supervisor who can not only increase productivity of the whole team but also promote the personal and professional growth of team members.

T

Tu

Software Engineer · Swappie

Reported to Janne directly

Showing recommendation 1 of 2: Tu, Software Engineer at Swappie
Contact

Let's work together

Whether you have a project in mind, want to discuss opportunities, or just want to say hello — I'd love to hear from you.