.NET ENGINEER - SENIOR

Senior Full Stack Software Engineer - Medical Robotics

Location:
Paris, France

Working Model:
Primarily On-Site (4-5 days per week)

Contract Type:
Freelance / Contractor

Duration:
12 Months (with strong likelihood of extension)

Industry:
Medical Devices / Surgical Robotics / Neurotechnology

Overview

Our client is an innovative medical robotics company developing a miniature robotic platform designed to navigate within the brain, enabling targeted biopsies and drug delivery for tumour treatment.

Due to continued growth, they are looking for an experienced Full Stack Software Engineer to join their software team and contribute to the next generation of image-guided robotic technology.

Key Responsibilities

• Design and develop software applications used for surgical planning, navigation and robotic control.
• Build and maintain full stack applications using
  Python
  and
  React.js
  .
• Develop image processing and visualization functionality for neurosurgical workflows.
• Work closely with robotics engineers to integrate software with hardware control systems.
• Contribute to navigation and targeting solutions using
  medical imaging data.
• Support software architecture, design, testing and deployment activities.
• Develop software within a regulated medical device environment.
• Participate in verification, validation and quality activities aligned with safety-critical development standards.
• Collaborate with multidisciplinary teams including software, robotics, biomedical and clinical specialists.

Required Skills & Experience

• Strong commercial experience with
  Python
  .
• Strong frontend development experience using
  React.js
  .
• Experience developing
  full stack software applications
  .
• Background in
  medical device software
  , healthcare technology, robotics or other regulated industries.
• Experience with
  medical imaging
  ,
  image processing
  , or visualization systems.
• Knowledge of
  safety-critical software development
  practices.
• Experience working on products that interact with hardware, robotics or embedded systems.
• Understanding of software architecture, testing and software lifecycle management.
• Strong communication skills and ability to work within a collaborative R&D environment.

Highly Desirable

• Experience developing
  neuronavigation
  or
  surgical navigation
  software.
• Experience within companies such as
  Brainlab
  ,
  Medtronic
  ,
  Stryker Navigation
  ,
  Zeiss
  , or similar medical imaging and navigation organisations.
• Exposure to
  robotics software
  .
• Knowledge of
  computer vision
  and advanced image-processing techniques.
• Familiarity with
  IEC 62304
  and medical device software development processes.
• Experience integrating software with
  embedded systems
  or hardware platforms.

Vous modernisez les patrimoines applicatifs critiques de nos clients : migration de cœurs mainframe COBOL vers Java et le cloud, refactoring assisté par IA, découplage de monolithes. Vous codez avec les meilleurs outils d'IA du marché, ancrés sur l'analyse structurelle réelle des systèmes, et vous livrez du code vérifié en production.

Ce que vous ferez

• Migrer et réécrire des composants critiques (COBOL vers Java 21, .NET moderne, services cloud-native)
• Industrialiser le refactoring assisté par IA sur des bases de plusieurs millions de lignes
• Fiabiliser les livraisons : tests ciblés sur les chemins d'exécution réels, revues, CI/CD

Votre profil

• 3 ans et plus de développement Java ou .NET sur des systèmes d'entreprise
• Goût du legacy complexe et de sa transformation, rigueur d'ingénierie
• Pratique des assistants de code IA et recul critique sur leurs productions

Candidater à ce poste →

Job Title:
Software Engineer

Type:
Full-time

Location:
Paris

What about us?
Launched in 2023, INFINIT is a fast-growing fintech scale-up operating in multiple countries across Europe and Americas.

At INFINIT we are on a mission to reshape the future of SMEs with AI at the forefront. Our all-in-one operating system has banking at its core, and empowers small business owners and their teams to seamlessly manage and optimize every aspect of their business with AI agents.

By focussing on specific industries, INFINIT delivers tailored, high-value solutions, while building innovative AI products to further unlock significant growth opportunities for our customers. INFINIT operates globally, with ambitions to further expand its footprint to redefine the fintech landscape for SMEs worldwide.

Join us on the INFINIT journey as we revolutionise the SME economy and drive meaningful impact through innovation 🚀

The Role
We are hiring a
Software Engineer (B2B Lending & Payments)
to take ownership of the financial infrastructure that powers how our clients finance their assets through INFINIT.

We believe the most resilient lending and payment systems are built by engineers who operate at the intersection of deep technical mastery, genuine product judgment, and direct proximity to the client’s financing workflow. This is not a ticket-execution role. You will work with business stakeholders and clients to understand why a problem matters before deciding what to build then use agentic coding to ship the how fast and well.

Partnering with other engineers owning this domain, you will own two deeply connected responsibilities. First, crafting the best possible experience for a client going through a loan application, from the moment they submit a request to the moment financing is confirmed, every step should feel clear, fast, and trustworthy. Second, ensuring that every payment executed throughout the loan lifecycle (interest accruals, supplier disbursements, reimbursement) is processed correctly, securely, and without exception. Third, supporting the physical audit and due diligence workflows that allow us to maintain control over the collateral throughout the life of the loan.

You will be the person the rest of the team pings when something in this domain breaks.

What do you need to be successful in this role?

• Expert C# & .NET Engineering, mastery of the .NET ecosystem with a focus on building high-performance, distributed backend systems. You have a proven track record of shipping scalable, production-grade architectures where technical clarity and long-term maintainability are the default.
• Core banking & ledger logic, a strong professional background in regulated financial environments. You understand the mechanics of ledgers, loan origination, and payment execution and the cost of getting any of it wrong.
• Mission-critical ownership: Demonstrated ability to own features end-to-end. You don't just "write code"; you analyze customer financing workflows, define rigorous technical requirements, and take full accountability for the reliability of every transaction you process.
• Highly effective stakeholder communication, capable of seamlessly translating deep technical concepts for non-technical stakeholders (customers, product managers) and clearly translating business objectives into prioritized engineering tasks.
• Practical experience leveraging modern developer tools (such as agentic coding or advanced automation techniques) to achieve significantly accelerated development velocity while rigorously upholding code quality standards.

What will you find working at INFINIT?

• Competitive Salary and Equity: We offer highly competitive salaries and a stake in our success with share options because we're building this together
• Diverse and Inclusive Team: Join a dynamic and international team in excess of 8 nationalities. You'll have the chance to work with experienced professionals from around the world, fostering a rich learning environment
• Inspiring Mission: We are dedicated to revolutionizing business financing and making a positive impact on the European economy. Your work at INFINIT will have a lasting effect on businesses and communities
• Flexible Benefits: Access Flexible Retribution benefits through a convenient mobile app
• Health and Well-being: Your health matters to us. You will have access to top-quality Medical & Mental Health Insurance
• Quality Time Together: We foster a sense of community with annual gatherings and bi-weekly office team gatherings. You're more than welcome to join us for quality time
• Personal Time Off: Enjoy flexibility with your personal time off
• Flexibility and Ownership: We trust our team and we are goal-oriented. Enjoy the flexibility of hybrid working 3 days a week in our Paris office and 2 days at home

Diversity and Inclusion
INFINIT promotes an inclusive culture that seeks equity and values different perspectives. We are proud to be an equal opportunity employer and consider all qualified applicants for employment without regard to race, color, religion, age, sex, sexual orientation, gender, gender identity, national origin, disability, veteran status or any other legally protected characteristic.

Qui sommes-nous ?

Rejoindre NEXTON, c'est intégrer une entreprise où convergent l'esprit d'un cabinet de conseil, la créativité d'une Factory et la dynamique d'une ESN ! Grâce à notre expertise, nous accompagnons des clients grands comptes et des pure players tels que SNCF, Orange, et BNP Paribas dans leurs stratégies d'évolution et d'innovation digitale.

Fondée en 2011, NEXTON réunit aujourd'hui une équipe de plus de 450 experts spécialisés dans le digital, le design, l'agilité, le produit et le développement. Ensemble, ils créent un écosystème riche en connaissances et en compétences diversifiées.

Description du poste

NEXTON
recrute un
Developpeur java/angular H/F,
en
CDI
, à
Paris
!

Ton futur environnement de travail :

Dans le cadre de ta mission, tu contribueras au développement pour l'un de nos comptes clients du secteur des transports.

L’équipe est composée de 10 personnes (7 développeurs, un responsable fonctionnel, un responsable technique et un chef de projet). Elle fonctionne en
méthodologie agile / Scrum
et intervient sur la refonte d’application.

Tu intégreras donc l’une des feature teams et joueras ton rôle de
développeur Full Stack Java / Angular
dans un environnement technique exigeant.

Tes missions :

En tant que
développeur Full Stack Java / Angular
, tu seras en charge de :

• Concevoir techniquement les évolutions de l’application
• Développer le front et le back (Java / Angular, HTML5, CSS, Javascript, Bootstrap )
• Consommer et exposer des
  webservices REST
• Rédiger les spécifications techniques et contribuer au maquettage des écrans
• Mettre en place et exécuter des tests automatisés (JUnit, outils associés)
• Contribuer à l’intégration et à la mise en production (CI/CD avec Jenkins, Ansible)
• Participer au chiffrage des user stories (Poker Planning)
• Être force de proposition sur les bonnes pratiques de développement pour garantir un code maintenable et évolutif

Qualifications

Tu as au moins
3 ans d’expérience en développement Full Stack Java / Angular.

Tu maîtrises
Java J2EE, HTML5, CSS, Javascript, Angular
et tu as une bonne connaissance du modèle
SOA
et des
webservices REST.
Tu as des compétences sur les outils d’intégration continue (Jenkins, Ansible, Git) et les tests automatisés (JUnit).

Enfin, tu es reconnu pour ta
rigueur
, ton
sens de l’organisation
, ton
autonomie
et ton
aisance relationnelle.

Informations supplémentaires

Pourquoi choisir NEXTON ?

Nous te proposons des avantages et des opportunités pour enrichir ton expérience professionnelle et personnelle tout au long de l'année :

▶ Des communautés dynamiques pour t'accompagner dans ton parcours.

▶ Des Meet Up pour développer tes compétences.

▶ Des formations pour te réinventer et progresser.

▶ Des événements sportifs et festifs pour t'épanouir.

▶ Un forfait mobilité durable pour faciliter ton quotidien et encourager la mobilité douce.

▶ Un téléphone de dernière génération pour rester connecté.

Prêt à nous rejoindre ?
Rencontrons-nous !

NEXTON