Fullstack Developer

IDEMIA; Paris; On-site; EUR 70,000 - 100,000; Full time

Job summary

IDEMIA Secure Transactions, a division of IDEMIA Group, is seeking a software engineering professional to contribute to the design, development and maintenance of high-assurance software solutions. You will work with Node.js, React, Next.js and TypeScript, focusing on robust coding practices, testing, and scalable architectures.

The role involves participating in architecture discussions, code reviews, and mentoring a small team of software engineers, with emphasis on secure coding and efficient

Qualifications

• Uses programming, scripting and database languages to write software code that meets requirements and that optimizes software performances.
• Identifies existing software components, libraries and frameworks to reuse in the solutions.
• Applies knowledge of software development best practices, including coding standards, secure coding, code reviews, source control management, build processes, testing, and operations.
• Contributes to requirement (functional and non-functional) analysis and estimations.
• Supports software testing, deployment, maintenance, and evolution activities by correcting programming errors, responding to scope changes, and coding software enhancements.
• Builds up software structure including functions, design patterns, layers, etc.
• Documents and demonstrates solutions by developing code comments, layouts, diagrams and charts.
• Contributes to Software architecture (specification analysis, technical studies, technology assessment, etc.).
• Codes large and complex modules within agreed quality, deadline and cost.
• Performs design and code reviews and assess software performance optimization.
• Contributes and promotes the organization's technical governance.
• Performs complex troubleshooting.
• Coaches and can manage a small team of Software Development Engineers.

Responsibilities

• Uses programming, scripting and database languages to write software code that meets requirements and that optimizes software performances.
• Identifies existing software components, libraries and frameworks to reuse in the solutions.
• Applies knowledge of software development best practices, including coding standards, secure coding, code reviews, source control management, build processes, testing, and operations.
• Contributes to requirement (functional and non-functional) analysis and estimations.
• Supports software testing, deployment, maintenance, and evolution activities by correcting programming errors, responding to scope changes, and coding software enhancements.
• Builds up software structure including functions, design patterns, layers, etc.
• Documents and demonstrates solutions by developing code comments, layouts, diagrams and charts.
• Contributes to Software architecture (specification analysis, technical studies, technology assessment, etc.).
• Codes large and complex modules within agreed quality, deadline and cost.
• Performs design and code reviews and assess software performance optimization.
• Contributes and promotes the organization's technical governance.
• Performs complex troubleshooting.
• Coaches and can manage a small team of Software Development Engineers.

Skills

Node.js

Frontend development

React

TypeScript

Python

Go

Automated testing

CI/CD

Tools

React

Next.js

TypeScript

Azure

AWS

GCP

Job description

IDEMIA Secure Transactions, a division of IDEMIA Group, is the leading technology provider making it safer and easier to pay and connect. With unmatched expertise in cryptography and credential issuance, IST is trusted by over 2,000 financial institutions, mobile operators, automotive manufacturers, and IoT providers worldwide. Every day, IST secures billions of essential transactions, ensuring the highest levels of data protection and convenience.

Key Missions

• Uses programming, scripting and database languages to write software code that meets requirements and that optimizes software performances
• Identifies existing software components, libraries and frameworks to reuse in the solutions
• Applies knowledge of software development best practices, including coding standards, secure coding, code reviews, source control management, build processes, testing, and operations
• Contributes to requirement (functional and non-functional) analysis and estimations
• Supports software testing, deployment, maintenance, and evolution activities by correcting programming errors, responding to scope changes, and coding software enhancements
• Builds up software structure including functions, design patterns, layers, etc.
• Documents and demonstrates solutions by developing code comments, layouts, diagrams and charts
• Contributes to Software architecture (specification analysis, technical studies, technology assessment, etc.)
• Codes large and complex modules within agreed quality, deadline and cost
• Performs design and code reviews and assess software performance optimization
• Contributes and promotes the organization's technical governance
• Performs complex troubleshooting
• Coaches and can manage a small team of Software Development Engineers

Profile & Other Information

• Node.js experience is preferred. Python, Go, Java, or similar backgrounds are welcome - what matters is strong software engineering fundamentals
• Frontend: React, Next.js, TypeScript, state management, component-driven UI, accessibility
• - Running and configuring AI agents, MCP servers, and AI skills
• - Context management for successful LLM-assisted development
• - LLM cost awareness - choosing the right model for the right task, managing token usage, avoiding waste
• - Creating reusable prompts, specifications, and QA loops for agent-driven development
• Experience with automated testing (unit, integration, end-to-end)
• Familiarity with CI/CD, cloud infrastructure, and IaC is a plus - not a requirement, but it accelerates your contribution

Nice to Have:

• Experience in the payments domain is considered a strong plus
• Cloud experience (Azure, AWS, or GCP)
• Open-source contributions or personal projects
• Experience working in startup, fast-paced, or MVP-driven environments