Senior Fullstack Software Architect (freelance contract)

Sunstice; Boulogne-Billancourt; Sur place; EUR 95 000 - 120 000; Plein temps

Résumé du poste

Sunstice is seeking a Senior Fullstack Software Architect for a 12-month freelance contract in the Île-de-France region. You will join an agile team to drive modernization, reduce technical debt, and evolve our frontend and backend architectures.

The role involves hands-on work across the software development lifecycle, technical decision-making, and close collaboration with cross-functional teams to deliver scalable, maintainable solutions.

Qualifications

• At least 8 years of professional software development experience.
• Strong expertise in Java and microservices-based architectures.
• Solid understanding of modern software engineering practices, including TDD, CI/CD, and code reviews.
• Experience with application performance optimization and scalable architectures.
• Ability to work autonomously while collaborating within cross-functional teams.

Responsabilités

• Analyze and assess existing technical debt and identify opportunities for improvement.
• Refactor and decompose complex application modules.
• Drive migration from monolithic to microservices architecture.
• Design and implement deployment pipelines and CI practices.
• Participate in all phases of software development from analysis to testing and reviews.
• Collaborate with developers, architects, and product stakeholders to deliver scalable solutions.

Connaissances

Java

Microservices

TDD

CI/CD

Code reviews

Autonomy

Outils

Docker

GitHub

Description du poste

Senior Fullstack Software Architect (freelance contract)

At Sunstice, we are undertaking a major transformation of our applications to improve scalability, maintainability, and overall software quality. As part of this initiative, we are looking for a Senior Fullstack Software Architect to join our team on a 12-month freelance contract (minimum) and contribute to key modernization projects.

About the Role

You will join an agile team working on strategic initiatives focused on reducing technical debt, evolving our software architecture, and modernizing our frontend applications.

As a senior engineer, you will play an active role in technical decision-making while contributing hands-on throughout the software development lifecycle.

What You Will Do

As a Software Architect, you will:

• Analyze and assess the existing technical debt, identifying opportunities for improvement.
• Refactor and decompose complex application modules.
• Drive the migration from a monolithic application to a microservices architecture.
• Design and implement deployment pipelines and continuous integration practices.
• Participate in all phases of software development, including technical analysis, design, implementation, automated testing, code reviews, and continuous improvement.
• Collaborate closely with developers, architects, and product stakeholders to deliver scalable and maintainable solutions.
• Help define technical solutions that address architectural, performance, and business challenges.
• Development Practices: TDD
• Containerization: Docker
• Version Control: GitHub

Who We Are Looking For

We're looking for an experienced software architect with:

• At least 8 years of professional software development experience.
• Strong expertise in Java and microservices-based architectures.
• Solid understanding of modern software engineering practices, including TDD, CI/CD, and code reviews.
• Experience with application performance optimization and software architecture is highly valued.
• The ability to work autonomously while collaborating effectively within cross-functional teams.
• Strong analytical skills, a pragmatic mindset, and a passion for solving complex technical challenges.