Senior Fullstack Developer Halmstad · Hybrid — 100%

Effektify; Halmstads kommun; Hybrid; SEK 700,000 - 900,000; Full time

Job summary

Effektify is a profitable scale-up with 50+ employees and 350+ customers. We are building a platform that turns marketing, e‑commerce, and business data into clearer insights and better decisions.

As a Senior Fullstack Developer, you will work across frontend and backend, with a heavier emphasis on backend, data, and cloud components. You will collaborate with our CTO and a small team in Halmstad, building features end-to-end using React, TypeScript, and Next.js, while ensuring reliability,

Qualifications

• Several years of experience in system development with a fullstack or backend-heavy focus.
• Strong skills in React, TypeScript, and Next.js.
• Experience building backend logic, APIs, and product functionality end-to-end.
• Experience with databases like PostgreSQL or MySQL.
• Comfortable with cloud-based deployments.
• Fluent English, written and spoken.

Responsibilities

• Build features end-to-end across frontend, backend, and data flows.
• Develop and improve APIs, backend logic, and integrations.
• Work with PostgreSQL and MySQL databases.
• Build and refine product experiences in React, TypeScript, and Next.js.
• Improve structure, performance, and maintainability across the stack.
• Collaborate close to cloud and infrastructure aspects of the platform.

Skills

React

TypeScript

Next.js

Fullstack

Backend development

APIs

PostgreSQL

MySQL

English (fluent)

Swedish (good)

Tools

AWS

Terraform

PHP / Laravel

Job description

As a Senior Fullstack Developer at Effektify, you will be responsible for building and refining a platform that harnesses marketing and business data to deliver actionable insights. Your focus will primarily be on backend, data, and cloud components while collaborating with the CTO and a small team to drive technical decisions and enhance product functionality. Key skills include expertise in React, TypeScript, and Next.js, along with strong experience in system development, APIs, and database management using PostgreSQL or MySQL. Effektify offers an engaging environment where your initiatives will be valued, and you will have opportunities to influence product direction while working with a profitable scale‑up company that has experienced significant growth.

Do you enjoy building products end-to-end and making complex systems feel reliable, useful, and easy to work with? Effektify is now looking for a Senior Fullstack Developer to build and improve a platform that turns marketing, e‑commerce, and business data into clearer insights and better decisions.

About the role

In this role at Effektify, you will work across both frontend and backend, with a bit more weight on the backend, data, and cloud side of the product.

You will build features that span the full chain — from APIs, databases, integrations, and business logic to product flows inReact,TypeScript, andNext.js. A big part of the role is making sure the platform is not just feature‑rich, but stable, scalable, and easy to keep developing over time.

You will work closely withMartin, our CTO, and the broader tech team, most of which is based inHalmstad. Since the team is still relatively small, you will have broad ownership and a real chance to shape both technical decisions and the product itself.

What you will work on

Your work will include a mix of:

• Building product features end-to-end across frontend, backend, and data flows
• Developing and improving APIs, backend logic, and integrations between different data sources
• Working with databases such asPostgreSQLandMySQL
• Building and refining product experiences inReact,TypeScript, andNext.js
• Improving structure, performance, and maintainability across the stack
• Working close to cloud and infrastructure‑related parts of the platform as the product grows
• Using modern AI tools in development to move faster, test ideas, and improve implementation quality

Examples of projects and focus areas

In the first phase, your work may include areas such as:

End-to-end product features for connected data
Build features that bring together data from ad platforms, e‑commerce systems, analytics tools, and business systems — and make that data useful in the product.

Backend and integration work that supports scale
Improve APIs, data flows, and backend structure so the platform becomes easier to develop, more reliable, and better equipped for new use cases.

Cloud and infrastructure improvements
Work close to deployment, environments, and technical foundations that help the platform scale in a stable and maintainable way.

Team and setup

A large part of the tech team is based inHalmstad, and for this role that is the preferred location.

We would like you to work from theHalmstad office around 2-3 days per week. The rest can be flexible depending on what makes sense for you and the team.

This is a good environment for you if you enjoy working in a smaller team where decision paths are short, ownership is high, and good ideas are taken seriously. Your initiative will matter here.

What we are looking for

Required

• Several years of experience in system development, with a clear focus onfullstackorbackend-heavy fullstack
• Strong skills inReact,TypeScript, andNext.js
• Experience building backend logic, APIs, and product functionality end-to-end
• Experience working with databases such asPostgreSQLorMySQL
• Comfortable working in modern product environments with cloud-based systems and deployments
• Fluent English, written and spoken

Nice to have

• Experience withPHP / Laravel
• Experience withAWS
• Experience withInfrastructure as Code, for exampleTerraform
• Experience from marketing platforms, e‑commerce, or other data-heavy products
• Good Swedish, written and spoken

Who are you?

We are looking for a developer who is:

• Curious and forward‑leaning
• Interested in new technologies and quick to test better ways of working
• Comfortable using modern AI tools as part of daily development
• Happy to take responsibility and move things forward
• Motivated by broad scope and a close connection between product decisions and implementation

About Effektify

Effektify is a profitable scale‑up with50+ employeesand350+ customers. Since 2021, we have grown from a small founding team into a multi‑office company with strong momentum, a working product, and a lot of room to shape what comes next.

At Effektify, we help companies understand what drives marketing performance and what to do next. Our platform brings together data from sources such asGoogle, Meta, LinkedIn, TikTok, analytics tools, Shopify, WooCommerce, and financial systems. That creates a product environment with many integrations, large amounts of connected data, and a constant need for solid backend structure as the platform grows.

For a fullstack developer, that means working on more than isolated features. You will help shape the systems, data flows, and product functionality that make the platform reliable, scalable, and useful in practice.

• Location:PreferablyHalmstad, with office presence around2-3 days per week