Jr Java Developper Full Stack

keystone-solutions; Namen; On-site; EUR 60,000 - 90,000; Full time

Job summary

Keystone Solutions is seeking an Expert Full Stack Developer for a consultancy mission with a large organization. You will join multidisciplinary Agile teams on client site to design, develop and modernize web applications using Angular, Java Spring, and PHP, ensuring quality and security.

You will contribute across the full SDLC, implement REST services, work with relational databases (MySQL/PostgreSQL), and participate in CI/CD, testing, and performance tuning.

Qualifications

• Strong experience delivering full stack web applications.
• Proficiency in Angular/TypeScript, Java/Spring, and PHP.
• Familiarity with MySQL or PostgreSQL and REST APIs.
• Experience working in Agile environments.

Responsibilities

• Design, develop, and deploy full stack web applications.
• Collaborate with UX/UI, testing, and architecture teams.
• Implement REST APIs and integrate with databases.
• Ensure code quality, security, and performance.
• Participate in CI/CD and automated testing.

Skills

REST architectures

Java (Spring)

PHP

Angular / TypeScript

Databases (MySQL, PostgreSQL)

Docker / Kubernetes

Git / GitLab

Maven / NPM / Composer

Jenkins / GitLab CI

Job description

Mission Overview:

Keystone Solutions is recruiting an Expert Full Stack Developer for a consultancy mission with our client, a large organization undertaking multiple digital transformation projects to modernize, secure, and optimize business applications for internal and external users. As a Keystone Solutions consultant, you will be integrated into the client's multidisciplinary Agile teams (functional analysts, architects, UX/UI, testers, project managers), primarily on the client site, to deliver tangible value across critical back‑office and front‑office web applications built with modern web architectures (Angular front‑end, Java and PHP back‑end, relational databases).

Objectives of the Mission:

• Participate in the creation and structuring of a new application maintenance unit.
• Design, develop, and evolve web applications that meet high business and regulatory requirements.
• Guarantee the quality, security, performance, and maintainability of the developed solutions, in compliance with the organization’s standards.
• Contribute actively to the modernization of the information system and the continuous improvement of existing applications.

Consultancy Model at Keystone Solutions:

In this role, you operate under Keystone Solutions’ consultancy model: you will work closely with the client’s teams, primarily on site at the client location, embedded within their product and project structures. You will collaborate directly with users and decision‑makers to accelerate delivery, align technology with business priorities, and maximize impact. Throughout the mission, you benefit from Keystone’s community support (pair programming, technical sparring, guilds, experience sharing) to enhance outcomes and sustain excellence.

Dynamic Projects and Varied Missions:

As a K‑Stone consultant, you contribute to critical front‑office and back‑office applications and address real‑world challenges across performance, security, scalability, and modernization (Angular, Java/Spring, PHP, REST APIs, relational databases). You gain exposure to diverse contexts across both public and private sectors, strengthening your end‑to‑end expertise.

Turbo‑Charged Learning and Development:

Keystone Solutions invests in your progression with expert mentorship, personalized development plans, technical workshops, training and certification budgets, structured feedback, and coaching in best practices (clean code, application security, CI/CD, testing). Your learning curve is accelerated by regular feedback and demanding client engagements.

Ambition and Career Growth in Consultancy:

Our career paths value technical excellence and client impact. Through varied client contexts and responsibilities (design, delivery, quality, team coaching), you can evolve from full stack development toward application architecture, technical leadership, or leading modernization initiatives according to your ambitions.

Keystone Solutions Values and K‑Stone Spirit:

Every consulting engagement is driven by our core values: service mindset, technical rigor, transparency, mutual support, and continuous improvement. Being a K‑Stone means embodying these values at the client, building trust through quality and clarity, and upholding our standards of excellence on every project.

Main Responsibilities:

• Designing, developing, and deploying full stack web applications across front‑end (Angular, TypeScript, HTML5, CSS/SASS) and back‑end (Java – Spring or equivalent – and PHP) layers, in accordance with current standards and best practices.
• Developing application components, web pages, and web services (REST APIs) that meet functional and non‑functional requirements.
• Participating in the entire software development lifecycle: design based on functional analyses, development, testing, integration, and production deployment.
• Providing corrective and evolutionary maintenance of applications and resolving defects.
• Collaborating closely with UX/UI, testing, architecture, and project management teams to translate business needs into robust, scalable technical solutions.
• Conducting technical analysis of requests in collaboration with the functional analyst and proposing appropriate solutions.
• Designing and evolving data models based on relational databases (MySQL, PostgreSQL).
• Implementing service‑oriented architectures while ensuring their performance, security, and maintainability.
• Contributing to the continuous improvement of code quality, application performance, and security.
• Setting up unit tests and, where appropriate, end‑to‑end tests to ensure adequate test coverage.
• Participating in code reviews and continuous improvement initiatives for development practices.
• Being proactive in addressing technical challenges and providing technical support to other developers.
• Respecting and integrating existing design systems and graphic charters into business applications.

Technical Skills:

• REST architectures – Junior
• Back‑end Java (Spring or equivalent) – Junior
• Back‑end PHP – Junior
• Front‑end Angular / TypeScript – Junior
• MySQL and PostgreSQL databases – Junior
• Containerization (Docker / Kubernetes) – Junior
• Versioning tools (Git, GitLab) – Junior
• Dependency management tools (Maven, NPM, Composer) – Junior
• CI/CD pipelines (Jenkins, GitLab) – Junior
• Unit testing and software quality (JUnit, Playwright or equivalent) – Junior

Expected Behavioral Competencies:

• Open‑mindness and adaptability
• Motivation for teamwork
• Good communication skills
• Organizational skills and autonomy
• Sensitivity to user experience (UX)
• Experience in an Agile environment appreciated
• Pragmatic, solutions‑oriented approach
• Ability to proactively improve existing practices

Role‑Specific Consultancy Impact:

As a Full Stack Expert in a consultancy context, you will apply your end‑to‑end skills across multiple client scenarios: designing REST APIs, integrating Angular/TypeScript front‑ends with established design systems, implementing CI/CD pipelines, enabling containerization with Docker/Kubernetes, optimizing application performance and security, and refining relational data models (MySQL, PostgreSQL). You will contribute from design to production releases in Agile mode while guiding client teams on best practices.

Evaluation Method:

Shortlisted candidates will be invited to an interview before a panel whose composition will be communicated later. The interview may be conducted remotely if circumstances require.

Language:

• French: professional level (C2)

Final Notes on Consultancy Engagement:

By joining Keystone Solutions, you intervene as a consultant integrated into client teams, working closely with stakeholders on site to accelerate decision‑making, align technology with business priorities, and deliver tangible value—supported by Keystone’s expert community and continuous improvement culture.

If you are ready ... apply today at Keystone Solutions Career Portal.