Junior/Mid Full Stack Developer (Data Focus)

Type:

Full-time

Work experience level:

Junior to Mid-level (1-4 years of relevant experience)

Starting date:

Immediate

Location:

Thessaloniki (Hybrid)

VaasaETT is a data-driven market analytics and consultancy business, specializing in complex end-user issues in energy markets across six continents and over 90 jurisdictions worldwide. We serve a global client base of energy companies, governments, regulators, innovators, investors, and enterprise consumers. Our insight is based on the most advanced data science, market-leading data sets, outstanding experience, and an unrivalled network of sources developed over more than two decades. VaasaETT assists clients with market assessment and entry, innovative development, and M&A, and carries out public research projects. Our goal is to support our clients in their efforts to transform and develop for the benefit of consumers, society, and sustainability. VaasaETT is headquartered in Helsinki, Finland, with additional offices in Greece, and key partners across EMEA, APAC, and the Americas.

See www.vaasaett.com for more information.

We are looking for a motivated Full Stack Developer

with a strong data focus to join our growing product engineering team and help build a next-generation SaaS platform for the energy and data analytics domain.

This is an excellent opportunity for someone who enjoys working with data and is eager to grow into a well-rounded full stack engineer. You will work closely with experienced developers, product teams, and business stakeholders to design, develop, and enhance data pipelines, APIs, databases, and analytical capabilities within a modern web platform built from the ground up.

We are looking for someone who is curious, proactive, and excited to learn every aspect of building a data-driven software product, from data ingestion, transformation, and modelling to APIs, databases, deployment, and architecture decisions.

The role will include:

• Learn and contribute across the entire software development lifecycle.
• Work closely with product managers, analysts, and end users to translate requirements into solutions.
• Participate in architectural discussions and product design decisions.
• Support testing, debugging, and continuous improvement of platform performance.
• Develop and maintain modern web applications using React
• Build intuitive, user-friendly dashboards and platform features.
• Develop and maintain ETL processes to extract, transform, validate, and load data from multiple sources into the platform.
• Work with PostgreSQL databases and help model application data.

We require you to have:

• 1-4 years of experience in software development.

• Experience with PostgreSQL

  , data modelling, and developing data-focused APIs or backend services using .NET

  or a similar framework.

• Experience with TypeScript

  , JavaScript

  and React

  .

• Strong knowledge of data engineering practices, including data ingestion, transformation, validation, and ETL

  workflows.

• Good understanding of HTML

  , CSS

  , and responsive design.

• Basic understanding of REST APIs

  and client-server architecture.

• Familiarity with Git

  and collaborative development workflows.

• Strong problem-solving skills and willingness to learn.

We value:

• Previous experience in building energy data platforms

• Experience in Python

• Familiarity with Azure

  cloud platforms

• Good personality and team player

• Any additional evidence of the above characteristics

We can offer you:

• Exposure to all aspects of product development and software architecture.
• Professional growth opportunities and hands-on learning.
• Flexible and collaborative working environment
• Work on meaningful data and analytics challenges with real business impact
• A truly international, diverse, and friendly work community (main company language is English)
• Competitive salary
• Work-life balance, flexible working arrangement, fun team activities
• Last but not least: Each employee’s ideas and suggestions are truly appreciated and often picked up immediately, no matter if they concern work, the work environment, or anything else

In this position, you will be employed directly by VaasaETT.

If you believe you are the right candidate for this position, please send your application letter and CV by 29.10.2026.

We kindly request that you include your project portfolio or any proven work experience building any SaaS platform, your proven expertise (or preference) in back-end and/or front-end tasks, and your salary expectations (gross annual) in the application letter.

Providing a salary range is acceptable as well.