Senior Fullstack developer

Deploja-Ab; Solna kommun; On-site; SEK 700,000 - 900,000; Full time

Job summary

Deploja is seeking a consultant with strong Java 21+ and Spring Boot expertise to design and build distributed backend systems. You will work on REST APIs, event-driven architectures with Kafka, and contribute to test automation across multiple projects.

Ideal candidates have experience with JUnit, Cucumber, Playwright/Selenium, and CI/CD pipelines (Jenkins). Fluency in English and strong problem-solving are essential for success at Deploja.

Qualifications

• Strong Java 21+ and Spring Boot experience.
• Designing microservices and distributed backends.
• REST APIs, Kafka, event-driven architectures.
• SQL with MS SQL or relational databases.
• JUnit and Cucumber for tests; automated testing mindset.
• Automated and manual testing capabilities.
• API testing tools like REST Assured.
• UI test automation with Playwright or Selenium.
• Git and CI/CD (Jenkins) integration.
• OpenAPI and AsyncAPI understanding.
• Structured manual and exploratory testing when needed.
• Strong problem solving and English communication.

Skills

Java 21+

Spring Boot

Microservices

REST APIs

Kafka

SQL

JUnit

Cucumber

Test automation

Playwright

Selenium

Git

CI/CD

Jenkins

OpenAPI

AsyncAPI

Manual testing

Exploratory testing

English communication

Tools

REST Assured

Job description

We now have a new requirement and are looking for a consultant colleague with the qualifications listed below. The position is part of our consulting business, which means you will be employed by us and work either with clients or on internal projects and assignments.

As part of your application, you may be presented to clients/partners as part of the recruitment process. If selected for the assignment, you will be employed by us and work either with clients or on internal projects and assignments as part of our consulting business.

Your Profile (Must-have requirements)

• Strong software development experience with Java 21+ and Spring Boot
• Experience designing and developing microservices and distributed backend systems
• Solid knowledge of REST APIs, Kafka and event-driven architectures
• Strong SQL skills and experience with Microsoft SQL or other relational databases
• Experience writing unit, integration and acceptance tests using JUnit and Cucumber
• Ability to design maintainable automated tests alongside production code
• Experience with API testing tools such as REST Assured or similar
• Experience testing asynchronous flows and validating data across services, messages and databases
• Working knowledge of UI test automation using Playwright, Selenium or similar
• Experience with Git and CI/CD tools such as Jenkins, including integrating automated tests into delivery pipelines
• Experience improving reusable test automation frameworks across multiple projects
• Understanding of OpenAPI and AsyncAPI specifications
• Ability to design and execute structured manual and exploratory tests when needed
• Strong problem-solving skills, quality mindset and good English communication skills

Meritorious

• Experience with React and frontend development
• Experience with Hibernate or similar persistence frameworks
• Knowledge of mutual funds, investment funds or finance in general
• Experience with cross-border cash payments
• Collaborative mindset and ability to share knowledge across Development, Test, DevOps and Product Management
• Adaptability, attention to detail and commitment to continuous learning and automation

Application deadline:

06-10-2026

About Us

We currently employ experienced consultants in areas such as System Development, AI, Machine Learning, Testing, Cloud, Infra DevOps, and IT Project Management. Working at Deploja is something entirely different from working at an ordinary consulting company—and we are really proud of that. So, what makes us unique? We simply offer more than just a high salary and greater freedom; that’s just the beginning. With us, you’ll find the work environment and opportunities you deserve. Welcome to Deploja, where the grass is indeed greener!