Fullstack Spring/Angular Senior Developer

Keystone Solutions is seeking a Confirmed Application Developer to join, as a consultant, a client mission focused on the "Electronic Payment Comparator" project. As a Keystone Solutions consultant, you will help our client develop two web applications: one for merchants to neutrally and independently compare different electronic payment options, and one for payment solution providers to input all required details of their offerings. Frontend development is in Angular. Backend development uses the Spring Framework (Spring Boot).

• →Provide external consultancy assistance to the client's "Electronic Payment Comparator" project as a Keystone Solutions consultant.
• →Design and develop a merchant-facing web application that enables neutral and independent comparison of electronic payment options.
• →Design and develop a provider-facing web application where payment solution providers are required to enter all detailed information about their offerings.
• →Implement and maintain the frontend using Angular.
• →Implement and maintain the backend using the Spring Framework (Spring Boot).
• →Build and consume REST services to support application functionality.
• →Use GIT for version control and collaboration.
• →Contribute code and solutions in Java and JavaScript.
• →Organize and track work using JIRA.
• →Create and interpret UML artifacts where useful for design and communication.
• →Carry out all responsibilities under Keystone Solutions' consultancy model, working closely with the client's teams.

• Role: Confirmed Application Developer.
• .Net: Junior level.
• Angular: Confirmed level.
• GIT: Junior level.
• Java: Confirmed level.
• JavaScript: Confirmed level.
• JIRA: Junior level.
• REST: Confirmed level.
• Spring Boot: Junior level.
• UML: Junior level.
• Most recent experience for the above technologies: any time.

• Dutch: Active knowledge.
• English: Passive knowledge.
• French: Native.

• Consultancy nature of work: You will be employed by Keystone Solutions and deployed to this client engagement, delivering the scope above on-site at the client location as required by the mission, while representing Keystone Solutions' standards and practices.
• Close client collaboration: You will integrate with the client's teams and stakeholders to align requirements, iterate on features, and ensure a neutral and independent comparison capability for merchants.
• Clear impact: Your contributions will directly enable merchants to make objective payment solution choices and providers to supply comprehensive, accurate data.

• After successfully delivering on this mission, you will have opportunities to tackle diverse challenges on additional client projects, applying Angular, Spring Boot, REST, and related technologies in different business contexts.
• As a Keystone Solutions consultant, you gain exposure to varied industries and architectures, accelerating your breadth of experience.

• Benefit from broad learning experiences through real-world client engagements, supported by Keystone Solutions' mentoring culture, knowledge-sharing sessions, and guidance for certifications.
• Sharpen your engineering craft with peer coaching, code reviews, and access to a community of practitioners who share patterns, tooling tips, and implementation playbooks.

• Chart a growth path that matches your ambition—whether deepening full-stack expertise, broadening into solution design, or evolving toward technical leadership—through successive client missions.
• We align engagements with your strengths and development goals so you consistently build market-relevant capabilities.

• Being a K‑Stone means bringing our consultancy values—craftsmanship, ownership, curiosity, and client impact—to every project.
• On this mission, that translates to building reliable, maintainable Angular and Spring Boot components, ensuring neutrality in comparison logic, and collaborating transparently with client stakeholders.

If you are ready to tackle technical and strategic challenges in a dynamic consultancy environment, apply today at Keystone Solutions Career Portal.