Senior Backend Engineer Jobs

Senior Backend Engineer

Assessfirst

Location:
France, Paris

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

55000.00 - 70000.00 EUR / Year

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Job Description:

As a Back End Engineer you are responsible for designing, developing, and maintaining the server-side components, APIs, and data architecture of our software applications. This role requires deep expertise in back-end technologies and the ability to build robust, scalable systems while collaborating effectively within an agile team environment. This position involves working closely with Engineering Managers, Product Managers, Front End Engineers, and other team members to implement features, improve system architecture, and ensure high-quality deliverables that meet both technical and business requirements. The Back End Engineer will be part of a cross-functional squad and will contribute to technical decisions while maintaining high standards of code quality, performance, and security.

Job Responsibility:

Design, develop, and maintain scalable back-end services and APIs
Build and optimize database schemas and data models
Write clean, maintainable, and well-tested code following team standards and best practices
Participate in code reviews and provide constructive feedback to team members
Debug production issues and implement robust solutions
Contribute to technical documentation and architecture decisions
Design and implement RESTful APIs and GraphQL endpoints
Optimize application performance, database queries, and system scalability
Implement caching strategies and asynchronous processing systems
Participate in agile ceremonies and technical planning sessions
Actively participate within an autonomous mission team (PM, Designer, Engineering manager, Front End Engineers) to clarify priorities and user needs
Contribute to technical discussions and architecture decisions
Collaborate with front-end engineers to define API contracts and data structures
Participate in squad rituals and team meetings
Handle support requests and bug fixes within agreed SLAs
Write unit tests and integration tests following TDD principles
Collaborate with QA team to ensure comprehensive test coverage
Participate in pair programming sessions with team members
Monitor application performance, scalability, and implement improvements
Follow security best practices and address vulnerabilities proactively
Contribute to continuous integration and deployment processes
Implement logging, monitoring, and alerting systems
Ensure data integrity and implement backup strategies

Requirements:

7+ years of professional software development experience in back-end development
Strong expertise in back-end technologies and system architecture
Comfortable with server-side technologies (Elixir, Node.js, Ruby, Python, Java, or similar)
Comfortable with database systems (PostgreSQL, MySQL, MongoDB, Redis, etc.)
Comfortable with RESTful APIs and/or GraphQL
Comfortable with microservices architecture and distributed systems
Comfortable with message queues and event-driven architectures (RabbitMQ, Kafka, etc.)
Comfortable with version control systems (Git)
Comfortable with testing frameworks and methodologies (unit, integration, end-to-end)
Comfortable with CI/CD practices and deployment automation
Comfortable with cloud platforms (AWS, GCP, Azure)
Comfortable with containerization and orchestration (Docker, Kubernetes)
Comfortable with software craftmanship practices
Strong problem-solving skills and attention to detail
Deep understanding of system design, scalability, and performance optimization
Excellent communication skills in both French and English
Ability to work effectively in a remote environment
A collaborative mindset and team-first attitude
Product thinking and user-centric approach to development
Commitment to writing maintainable, well-documented code
Proactive attitude in suggesting improvements and solutions
Security-first mindset and awareness of common vulnerabilities

What we offer:

Four-day week
Professional development plan
Sick child leave
Mental health benefits
Employee Resource Groups (ERG)

Additional Information:

Job Posted:
December 21, 2025

Employment Type:

Fulltime

Work Type:

Hybrid work

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