Full Stack Engineer

Sigli; Belgique; Hybrid; EUR 49,000 - 58,000; Full time

Job summary

Sigli is seeking a Full-Stack Developer to build and maintain an ESG platform that turns complex sustainability data into clear, fast features. You will own features from idea through production, collaborating with the CTO and engineering team in a flexible, in-house role with remote options for the Flemish region.

The role emphasizes strong TypeScript/Next.js skills, data-heavy interfaces, and a startup mindset. You’ll work on APIs, data models, and performance, shaping how we grow as a team.

Qualifications

• At least three years of professional software development experience.
• Strong skills in TypeScript and Next.js.
• Based in the Flemish region of Belgium.
• Ownership and startup mentality; ability to drive work forward.

Responsibilities

• Build and maintain the ESG platform across the stack, with TypeScript and Next.js at its core.
• Work with large sustainability datasets, structuring and transforming data for reliability.
• Own features end to end from idea to production and follow up.
• Write clean, tested code and participate in code reviews.

Skills

TypeScript

Next.js

React

Data analytics

Software development

Tools

Data visualization libraries

Dashboards

QA practices

Job description

We are looking for a Full-Stack Developer to build the platform clients use every day. The product is data-heavy, so you will turn complex sustainability data into clear, fast and reliable features, from the database to the screen. You will work closely with the CTO and engineering team, own features from idea to production, and help shape how we build as we grow. This is a full-time, in-house position with flexible remote work in the Flemish region.

What you will do:

• Build and maintain our ESG platform across the stack, with TypeScript and Next.js at its core.
• Work with large and complex sustainability datasets — structuring, transforming and integrating data so it can be used reliably across the platform.
• Own features end to end: clarify the need, design the solution, ship it and follow up.
• Write clean, tested code and take part in code reviews, both giving and receiving feedback.
• Work with the CTO and back-end developers on APIs, data models, data flows and performance.
• Bring ideas to improve the product, our tooling and how we work.

What you need:

• At least three years of professional experience in software development or a combination of both QA and software development.
• Strong skills in TypeScript and Next.js (React).
• Some familiarity with data analytics or big data, and comfort working with data-heavy interfaces.
• You understand every line you ship. AI tools are welcome, vibe coding is not.
• Based in the Flemish region of Belgium.
• Ownership. You take initiative and drive your work forward without waiting for instructions.
• Startup mentality. Things move fast, priorities shift, and you enjoy building something from the ground up.
• Open communication. You speak up, ask questions and share problems early.
• Quality. Every change goes through code review, and we care about code we can maintain.

Nice to have:

• Experience with data visualization libraries and dashboards.
• Experience with testing and QA practices (unit, integration or end-to-end tests).
• Interest in sustainability, ESG or climate tech.

What's in it for you:

• A full-time, in-house employment contract.
• A gross monthly salary of up to €4,800, depending on experience.
• Flexible remote work, with our office in Antwerp available and no strict office policy.
• Real ownership and a direct line to the founders in a small team.
• Meaningful work that helps companies meet their sustainability goals.

A. Goštauto G . 40 , LT-01112 Vilnius, Lithuania