Horizon Trading Solutions ? 

• Une Fintech spécialisée dans la conception d’une plateforme facilitant les différentes activités de trading sur les marchés financiers électroniques (automatisation de certaines activités (Market Making, Algo Trading...), gestion des ordres et exécutions de manière optimale (Agency Trading, Order and Execution Management System…), 

• Un logiciel à la fine pointe de la technologie déployée sur site ou en SaaS, 

• Une roadmap produit ambitieuse : Machine Learning, IA, Crypto Currencies, Low Latency… 

• Une société à taille humaine (120 collaborateurs) où vous pouvez faire une différence, 

• Une société internationale présente dans 6 pays pour servir des clients répartis sur 26 pays, 

• Une société engagée : certifié B-Corp, partenaire de Planet Tech’care, Ethical IA et Lakaa, fond de dotation, 

• Une société reconnue dans son domaine : Best trading solution for listed securities 2022 et 2023, Best trading system strategy development 2022, Best sell-side OMS 2021, Multi-Asset Trading System of the year 2020…  
   

Votre rôle ?  

Au sein d’une équipe Scrum de 6 à 9 personnes, vous participerez aux étapes de développement de nos solutions (de la spécification jusqu’à l’intégration) : 

• Intégration et assemblage des applications Java : Assurer la compatibilité et l'assemblage des différents modules pour garantir une plateforme fonctionnelle. 

• Automatisation des tests : Concevoir, développer et maintenir des suites de tests automatisés couvrant tous les aspects (unitaires, intégration, performance, sécurité). 

• Environnements de test et CI/CD : Gérer la configuration et l'automatisation des environnements de test, en intégrant les processus dans les pipelines CI/CD. 

• Collaboration avec les équipes : Participer aux revues de conception, apporter un regard critique sur la testabilité et améliorer la qualité logicielle. 

• Plans et stratégies de test : Définir et mettre en place des plans de test couvrant les aspects fonctionnels et non fonctionnels. 

• Suivi et analyse : Exécuter les tests, analyser les bugs et collaborer avec les développeurs pour améliorer le code. 

• Documentation et reporting : Prioriser et documenter les anomalies dans les outils de suivi. 

• Amélioration continue : Optimiser les stratégies de test pour accélérer les processus et améliorer la couverture. 

• Mentorat et leadership : Encadrer les membres plus juniors, partager ses connaissances, promouvoir les meilleures pratiques en automatisation des tests, et avoir la capacité d’évoluer progressivement vers un rôle de référent technique sur ces sujets. 

Votre environnement technique ? 

• Une application multi-process de plusieurs millions de lignes en Java pour le cœur de notre produit. 

• Des briques spécifiques en Scala via une plateforme intégrée pour des développements spécialisés. 

• Une infrastructure robuste reposant sur Docker et Linux, assurant flexibilité et performance. 

• Une gestion efficace des bases de données grâce à SQL et NoSQL, selon les besoins des fonctionnalités. 

• Une chaîne CI/CD automatisée avec GitLab CI, permettant le déploiement et la validation rapide du code. 

• Des dizaines de milliers de tests (unitaires et d’intégration) exécutés à chaque push, incluant des tests fonctionnels avec Cucumber. 

• Aux détours de certaines parties du produit, vous pourrez être confronté(e) à d’autres technologies telles que TypeScript, React, Kafka, Stack ELK... 

Et si c'était vous ? 

Vous êtes un Ingénieur SDET / DevOps expérimenté, passionné par l'automatisation et l'amélioration continue des processus de test avec comme compétences :  

• Java (intermédiaire) : Expérience concrète en développement backend Java nécessaire pour intégrer, étendre et maintenir les tests automatisés existants et développer de nouveaux modules fonctionnels. 

• DevOps / CI/CD (avancé) : Maîtrise des outils GitLab CI, Docker et pipelines complexes. 

• Test automation (avancé) : Conception et évolution de frameworks de tests automatisés. 

• Linux (intermédiaire à avancé) : Maîtrise des environnements et scripting (Bash, Shell). 

• Qualité logicielle (avancé) : Application des meilleures pratiques (code reviews, gestion des anomalies, métriques qualité) 

• Anglais (avancé) : Nécessaire pour lire les spécifications, rédiger du code et de la documentation et échange avec les équipes basées à l'étranger. 

 Ces compétences seraient un plus : 

• BDD / Cucumber (avancé) : Rédaction et intégration de scénarios BDD dans les pipelines CI/CD. 

• SQL / Bases de données (intermédiaire) : Bonne compréhension des bases relationnelles. 

• Cloud / Virtualisation (intermédiaire à avancé) : Expérience avec Docker, Kubernetes et plateformes cloud. 

• Intérêt ou expérience dans le domaine financier / trading algorithmique serait apprécié. 

 Pourquoi nous rejoindre ? 

• Un cadre de travail stimulant avec des défis techniques variés et des sujets fonctionnels riches. 

• Une équipe experte et passionnée : rejoignez une communauté de développeurs talentueux dans un contexte international. 

• Un environnement de travail collaboratif: événements réguliers (déjeuners, afterworks, sensibilisation climatique, etc.) et jusqu’à 3 jours de télétravail par semaine après la période d'essai. 

• Une intégration personnalisée : bénéficiez d'un programme d'onboarding structuré avec un mentor pour faciliter votre prise de poste. 

 Alors n’hésitez pas et rejoignez l’aventure Horizon ! 

 Le processus de recrutement ? 

• Un premier échange avec Mohamed, Talent Acquisition, 

• Un entretien technique avec Julien, Head of QA, 

• Un dernier échange avec un membre de l'équipe

Join a team of passionate and hardworking entrepreneurs to transform healthcare! 

Working in the tech team at Doctolib involves building innovative products and features to improve the daily lives of care teams and patients. We work in feature teams in an agile environment, while collaborating with engineering, design, and business teams.

Doctolib is looking for a Senior Site Reliability Engineer to keep Doctolib production database systems running smoothly. You will also be a key-player to support the exponential growth of Doctolib services.

What you will do

You will join a team of developers, DBA and SRE responsible for:

• Improving and protecting the health of our datastores,
• Empowering the whole tech teams to use our datastores in the most efficient way,
• Collaborating everyday with our Database Architects, Principal Engineers and Site Reliability Engineers from other teams.

As a Senior Site Reliability Engineer in our Doctolib Database Optimization team, you will play a critical role in ensuring the reliability, availability, and performance of our databases. You will:

Design, build and maintain core infrastructure databases that allow Doctolib scaling to support hundreds of thousands of concurrent users.

• Automate deployment, scaling, and maintenance of databases to enhance system reliability and operational efficiency,
• Implement and improve monitoring, alerting, and incident response processes to identify and address potential issues before they impact both practitioners and patients,
• Provide documentation and tooling to empower the feature teams in their use of their databases, while ensuring their reliability,
• Mitigate production database issues during working hours when the issue cannot be fixed by the responsible feature team,
• Research and evaluate new technologies, tools, and best practices to continuously improve the reliability and availability of our systems and processes.  

Who you are

Are you convinced that you have exactly what it takes for the position? Then we encourage you to apply. Even if you don't meet every requirement, you might be exactly the right future Doctoliber for this or other positions!

• Have a strong hands-on experience (6y+) on a production platform, if possible at scale,
• Have proven experience with cloud platforms such as AWS, Azure or Google Cloud, 
• Have proven experience with datastores such as PostgreSQL and/or Kafka and/or Couchbase,
• Have solid understanding of containerization and orchestration technologies (Docker and Kubernetes),
• Have proficiency in at least one programming language (Ruby, Python, Go, Java, etc.) and understanding of infrastructure as code principles,
• Are fluent in English.

Now, it would be fantastic if you:

• Have an experience with monitoring and observability tools,
• Like troubleshooting performance issues in complex environments.

What we offer

• Free Health Insurance for you
• Up to 14 days of RTT
• A flexible workplace policy offering both hybrid and office-based modes
• Flexibility days allowing to work in EU countries and the UK 10 days per year
• Wellbeing program with free mental health and coaching through moka.care
• Special support package for caregivers and workers with disabilities
• Lunch voucher with Swile card
• Work Council subsidy for sport club membership or creative activities
• Bicycle subsidy
• Public transportation reimbursement
• Relocation support for international mobility

The interview process 

• Recruiter Interview
• DBRE technical interview
• System Design Interview
• Behavioral interview
• Reference Check
• Offer!

Job details

• Contract: Permanent position
• Workplace: Paris 
• Start date: As soon as possible
• Remuneration: Competitive salary package according to your profile
  
  

Mission

Speechify is the easiest way to listen to the world’s information. Articles on the web, documents in the cloud, books on your phone. We absorb it all and let you listen to it at your desk, on the go, at your own speed, and with tools that make learning easier, deeper, and faster.

What streaming services have done for audio entertainment, we’re doing for audio information. And whatever we’re doing seems to be working. We’re #1 in our category, and experiencing exponential growth.

Overview

We're looking for a Senior Software Engineer to join our Core Experiences Team. This team builds and maintains the foundational services and SDKs that power Speechify’s product experience across platforms. It's a critical role for someone who enjoys working at the intersection of product and infrastructure, thinks strategically, and is passionate about designing clear, reliable APIs and simple systems that directly enhance the user experience.

What You’ll Do

• Collaborate with Speechify’s Product Teams to scope projects, find ways to reduce scope to get faster feedback from customers, navigate the integration/UX tradeoffs relevant to different product teams, and deliver solutions via our cross-platform SDK
• Optimize existing functionality to ship things like faster loading and more intelligent parsing by designing more efficient abstractions and improving our algorithms
• Ship cloud functions, lightweight backend services, and jobs using Kotlin

An Ideal Candidate Should Have

• Systems thinking. You know that optimizing a system requires end-to-end design, and you believe simplicity is valuable.
• Speed. You work quickly to generate ideas and options and know how to decide which things can ship now and what things need time
• Focus. We’re a high-growth startup with a busy, remote team. You know how and when to engage or be heads down
• Collaboration. You know how to inspire, play, and negotiate with opinionated designers, marketers, and PMs
• Preferred Tech Stack:
  • Kotlin Multiplatform (Java experience is OK but role is Kotlin Multiplatform) 
  • Prior experience with GCP is a plus

What We Offer

• A fast-growing environment where you can help shape the company and product.
• An entrepreneurial-minded team that supports risk, intuition, and hustle.
• A hands-off management approach so you can focus and do your best work.
• An opportunity to make a big impact in a transformative industry.
• Competitive salaries, a friendly and laid-back atmosphere, and a commitment to building a great asynchronous culture.
• Opportunity to work on a life-changing product that millions of people use.
• Build products that directly impact and support people with learning differences like dyslexia, ADD, low vision, concussions, autism, and more.
• Work in one of the fastest growing sectors of tech, the intersection of artificial intelligence and audio.

Think you’re a good fit for this job? 

Tell us more about yourself and why you're interested in the role when you apply.
And don’t forget to include links to your portfolio and LinkedIn.

Not looking but know someone who would make a great fit? 

Refer them! 

Speechify is committed to a diverse and inclusive workplace. 

Speechify does not discriminate on the basis of race, national origin, gender, gender identity, sexual orientation, protected veteran status, disability, age, or other legally protected status.

Join a team of passionate and hardworking entrepreneurs to transform healthcare! 

Working in the tech team at Doctolib involves building innovative products and features to improve the daily lives of care teams and patients. We work in feature teams in an agile environment, while collaborating with engineering, design, and business teams.

Doctolib is looking for a Senior Site Reliability Engineer to keep Doctolib production database systems running smoothly. You will also be a key-player to support the exponential growth of Doctolib services.

What you will do

You will join a team of developers, DBA and SRE responsible for:

• Improving and protecting the health of our datastores,
• Empowering the whole tech teams to use our datastores in the most efficient way,
• Collaborating everyday with our Database Architects, Principal Engineers and Site Reliability Engineers from other teams.

As a Senior Site Reliability Engineer in our Doctolib Database Optimization team, you will play a critical role in ensuring the reliability, availability, and performance of our databases. You will:

Design, build and maintain core infrastructure databases that allow Doctolib scaling to support hundreds of thousands of concurrent users.

• Automate deployment, scaling, and maintenance of databases to enhance system reliability and operational efficiency,
• Implement and improve monitoring, alerting, and incident response processes to identify and address potential issues before they impact both practitioners and patients,
• Provide documentation and tooling to empower the feature teams in their use of their databases, while ensuring their reliability,
• Mitigate production database issues during working hours when the issue cannot be fixed by the responsible feature team,
• Research and evaluate new technologies, tools, and best practices to continuously improve the reliability and availability of our systems and processes.  

Who you are

Are you convinced that you have exactly what it takes for the position? Then we encourage you to apply. Even if you don't meet every requirement, you might be exactly the right future Doctoliber for this or other positions!

• Have a strong hands-on experience (6y+) on a production platform, if possible at scale,
• Have proven experience with cloud platforms such as AWS, Azure or Google Cloud, 
• Have proven experience with datastores such as PostgreSQL and/or Kafka and/or Couchbase,
• Have solid understanding of containerization and orchestration technologies (Docker and Kubernetes),
• Have proficiency in at least one programming language (Ruby, Python, Go, Java, etc.) and understanding of infrastructure as code principles,
• Are fluent in English.

Now, it would be fantastic if you:

• Have an experience with monitoring and observability tools,
• Like troubleshooting performance issues in complex environments.

What we offer

• Free Health Insurance for you
• Up to 14 days of RTT
• A flexible workplace policy offering both hybrid and office-based modes
• Flexibility days allowing to work in EU countries and the UK 10 days per year
• Wellbeing program with free mental health and coaching through moka.care
• Special support package for caregivers and workers with disabilities
• Lunch voucher with Swile card
• Work Council subsidy for sport club membership or creative activities
• Bicycle subsidy
• Public transportation reimbursement
• Relocation support for international mobility

The interview process 

• Recruiter Interview
• SRE Technical interview
• System Design Interview
• Behavioral interview
• Reference Check
• Offer!

Job details

• Contract: Permanent position
• Workplace: Nantes
• Start date: As soon as possible
• Remuneration: Competitive salary package according to your profile
  
  

Your Impact

We are looking for a Senior AI Engineer to join the Customer Care Contact team in the Business Performance domain.

Your mission will be to build AI-powered tools that revolutionize how healthcare professionals deliver care. You will work on Doctolib Assistant, our AI personal assistant designed to assist doctors and medical staff in their daily work—from answering complex medical questions to automating administrative tasks with accuracy, reliability, and safety.

Working in the tech team at Doctolib means building innovative products and features to improve the daily lives of care teams and patients.

What you'll build

• Design, ship, and operate production-grade agentic systems powering Doctolib Assistant, our AI personal assistant that addresses key challenges for healthcare professionals
• Build and improve AI agents and our orchestration systems
• Partner with data scientists to design and implement evaluation pipelines, security/safety guardrails, and metrics—while taking ownership of operational AI projects as data science teams focus on exploratory research
• Develop and maintain core agentic capabilities including memory, reasoning orchestration, tool adapters, and multi-agent coordination, ensuring strong observability, fallback mechanisms, and fail-safe behaviors
• Own performance, observability and security: monitoring dashboards, SLO/SLI, and security posture
• Ensure privacy and security by design, with a particular focus on medical data sensitivity
• Contribute to fullstack development when needed to deliver end-to-end features for healthcare professionals

What you'll bring

• Have 4+ years of experience as a software engineer, with hands-on experience in AI/ML systems
• Have 2+ years of experience working with Python
• Have gone through the full lifecycle of an AI product, from initial evaluation and launch to iterations based on results in production
• Understand and promote best practices related to the software development life cycle such as automated testing, good use of CI/CD, and DevOps practices
• Are comfortable with fullstack development and not afraid to dive into React/TypeScript/Kotlin to ship end-to-end features
• Are product-oriented and comfortable guiding your teammates to suggest tradeoffs to balance business needs with technical constraints
• Are comfortable speaking and writing in English in your day-to-day work with the team

• Have experience building multi-agent systems or agent development frameworks
• Have worked on AI products for enterprise/professional users
• Have experience in the medical domain or healthcare tech

Life at Doctolib Tech

• Our solutions are built on a single, fully cloud-native platform that supports web and mobile app interfaces, multiple languages, and is adapted to country and healthcare specialty requirements.
• Our stack is composed of Rails, TypeScript, Java, Python, Kotlin, Swift, and React Native.
• We leverage AI ethically across our products to empower patients and health professionals. Discover our AI vision here.

What we offer

• Free comprehensive health insurance for you and your children
• Parent Care Program: receive additional leave on top of the legal parental leave
• Free mental health and coaching services through our partner Moka.care
• For caregivers and workers with disabilities, a package including an adaptation of the remote policy, extra days off for medical reasons, and psychological support
• Work from abroad for up to 10 days per year, thanks to our flexibility days policy
• Up to 14 days of RTT
• A subsidy from the work council to refund part of the membership to a sport club or a creative class
• Lunch vouchers (Swile card) worth €8.50 per working day, with €4.50 covered by Doctolib
• 50% reimbursement of your public transport subscription
• Enrollment in Doctolib's long-term employee value sharing plan called DoctoGrowth
• Relocation support in case of international mobility
• Access to the best AI tools for coding, development and dedicated training

Our interview process

• Recruiter Interview
• Coding Interview
• System Design Interview (with focus on AI systems architecture)
• Behavioral Interview
• At least one reference check

Job details

• Permanent position
• Full-time
• Location: Nantes, France
• Start date: as soon as possible

We welcome everyone

At Doctolib, we are committed to improving access to healthcare for everyone. This translates into our recruitment process. We evaluate candidates based solely on qualifications and motivation, without any form of discrimination.

The more diverse ideas are heard, the more our product will truly improve healthcare for all. You are welcome to apply to Doctolib, regardless of your gender, religion, age, sexual orientation, ethnicity, or disability.

To ensure equal opportunities, we invite you to exclude personal information (e.g., pictures, age) from your applications. If you require any accommodation, please let us know for support during the hiring process.

Join us in building the healthcare we all dream of!

Your data privacy

Notre domain In-store recherche un·e Senior Software Engineer (Tech Lead) (f/m/d)

🚀 Le Challenge : Repenser et moderniser le moteur S&OP mondial

Dans le domaine “store efficiency”, nous opérons le cerveau décisionnel qui transforme les prévisions de ventes en flux de travail optimisé pour nos 1 800+ magasins dans 70 pays (1To de data). Notre système de « Labor Demand Planning » est un levier critique pour la performance économique et l'excellence opérationnelle de nos magasins, garantissant une organisation optimale des équipes face aux flux clients.

Tu rejoins une équipe senior avec des process d’ingénierie bien rodés. Le produit est robuste et a déjà fait ses preuves, mais nous lançons aujourd'hui une refonte de ses fondations pour anticiper nos futurs enjeux de scale. Ton défi : piloter cette transition technique, avec un focus sur les moteurs de calcul et de recherche.

💡 Ton rôle de leader technique

• Modernisation & Re-platforming : Piloter la ré-architecture profonde du système (DDD, découplage, Clean Architecture) tout en garantissant la continuité de service mondiale.
• Expertise Backend & Search : Faire d'Elasticsearch un pilier central de l'aide à la décision. Tu optimises les indexations et les requêtes complexes pour offrir une réactivité instantanée sur des volumes de données massifs.
• Leadership Technique : Soutien à la montée en compétence d'une équipe de 5 ingénieur·es, en favorisant le partage de bonnes pratiques et l'autonomie technique.
• Collaboration Transverse : Tu assures la cohérence avec les briques périphériques (Front-end React, pipelines Spark ETL, Data Analysts) tout en restant focalisé·e sur la robustesse du socle Java.

🛠️ La Stack technique

• Cœur Backend : Java 21, Spring Boot 4.x (migration WebFlux/Reactive -> Virtual Threads).
• Moteur de Recherche : Elasticsearch (expertise approfondie pour le requêtage métier complexe).
• Data & Cache : PostgreSQL, Redis.
• Infra & DevOps : Google Cloud Platform (GCP), Kubernetes, FluxCD.
• Qualité : TDD, JUnit 5, Testcontainers (clé pour sécuriser nos refontes), SonarCloud.
• À la marge : Scala/Spark (ETL), React (Front-end).

✨ Ce que tu apportes

• Expertise Java confirmée (7+ ans) : Bonne maîtrise du développement Backend, avec une capacité démontrée à structurer des logiques métier complexes et du code industriel durable.
• Maîtrise d'Elasticsearch : Tu sais tuner le moteur sous le capot pour des performances optimales en lecture et écriture.
• Expérience de la Refonte : Tu as déjà vécu la transformation d'un projet existant et tu maîtrises les patterns de migration (Strangler Fig, etc.).
• Mindset Engineering : Tu as une capacité démontrée à modéliser des problématiques métier denses pour les traduire en solutions techniques simples et pérennes.
• Pragmatisme : Tu sais arbitrer entre innovation technique et livraison de valeur continue.

💰 Ce que nous t'offrons

• Mode de travail hybride. 
• Cadre : Bureaux Decathlon Digital à Nantes (gare sud)
• Équipement : MacBook Pro ou Dell XPS de dernière génération
• Développement : Certifications Cloud (GCP), accès aux conférences (Devoxx, etc.), et temps dédié à la veille technique
• Package de rémunération attractif (participation des employés aux actions de l'entreprise, bonus mensuels/trimestriels)
• Vie d'équipe et Bien-être : de nombreux sports et défis ensemble et événements réguliers (afterworks, team buildings, triathlon par équipe) pour maintenir une excellente cohésion et un équilibre vie pro/perso optimal.