Backend Software Engineer - H/F

Join the dynamic technical teams at iad Business Factory, where you will work under the guidance of an Engineering Manager. You will be part of a collaborative squad consisting of developers, Product Owners, Project Managers, Quality Assurance specialists, and designers, all focused on enhancing our Playiad application.Your role will involve developing innov…

About Mistral AIAt Mistral AI, we harness the transformative potential of AI to streamline tasks, enhance creativity, and optimize learning experiences. Our cutting-edge technology seamlessly integrates into everyday workflows.We are committed to democratizing AI through high-performance, open-source solutions and state-of-the-art models. Our comprehensive AI platform is tailored to meet the diverse needs of enterprises, available both on-premises and in the cloud. Notably, our offerings include Le Chat, the AI assistant designed to elevate both personal and professional life.As a dynamic and collaborative team, we are passionate about AI's potential to create a significant societal impact. Our diverse workforce thrives in competitive environments and is dedicated to fostering innovation. With teams spread across France, the USA, the UK, Germany, and Singapore, we embody creativity, humility, and a strong team spirit.Join us in shaping the future of AI and make a meaningful impact. Discover more about our culture at https://mistral.ai/careers.Role OverviewWe are in search of enthusiastic and talented software engineers to join our team. As a Backend Engineer, you will play a crucial role in developing the core systems that power our key products: AI Studio, Le Chat, and Mistral Code. Your contributions will shape the way users and developers interact with our AI platform at scale. You’ll focus on building reliable, high-performance backend systems and APIs that cater to millions of users and developers. Your work will greatly enhance both developer and user experiences, ensuring they are engaging, efficient, and intuitive. We welcome engineers of all levels, from recent graduates to seasoned professionals, who are eager to learn, collaborate, and deliver impactful solutions.Key ResponsibilitiesDepending on your expertise, you will engage with critical components of our technology, which may include:Backend Development- Design, develop, and maintain scalable and robust backend features and APIs using modern frameworks.- Ensure high performance and reliability across our distributed systems.

About the Role airapps is looking for a backend engineer to help build and maintain the systems behind our applications. This position is based in Paris and focuses on developing backend solutions that scale and perform reliably. What You Will Do Design, implement, and maintain backend systems for airapps products Work closely with teammates to solve technical challenges Contribute to a collaborative team environment Who We’re Looking For Experience building backend systems Comfort working with others to solve problems Interest in developing efficient and scalable solutions This is a full-time role in Paris. If building reliable backend infrastructure with a team sounds appealing, airapps would like to connect.

Join our dynamic team as a Backend Engineer specializing in Rust at connecthum, a pioneering AI infrastructure startup dedicated to constructing the safety and control layers for expansive AI systems.About connecthum:We are an AI-native product company focusing on AI safety and infrastructure.Supported by a diverse range of international investors.Our systems manage high volumes of AI traffic across enterprise environments.We train and fine-tune our proprietary models to ensure optimal performance and reliability.A compact yet highly skilled team that delivers rapid results.Our mission is to create the evaluation and control layer for AI systems, enabling organizations to define, test, and enforce AI behavior in real-world situations.Your Contribution:Design and implement robust Rust backend services that facilitate real-time policy enforcement.Take ownership of features from conception to deployment - including API design, database schema, and monitoring.Develop high-throughput data pipelines to manage extensive AI traffic efficiently.Enhance system performance, reliability, and observability.Collaborate across the stack as needed, prioritizing problem-solving over strict boundaries.Work closely with product, research, and ML teams to drive innovation.This role is hands-on, directly influencing how AI operates in production settings.Technical Environment:Asynchronous Rust (Tokio)Utilizing modern web frameworks such as Axum and ActixPostgreSQL for large-scale applicationsImplementing caching and event streaming architecturesBuilding high-throughput distributed systemsFocus on production observability and performance tuning(In-depth technical stack details will be shared during interviews)Your Expertise:Demonstrated production experience in developing backend systems using Rust.Strong foundation in asynchronous programming and concurrency principles.Excellent system design capabilities, including scalability, failure modes, and trade-offs.Proficient with PostgreSQL and other related technologies.

About LuoPayLuoPay is a rapidly expanding financial exchange (FX) and cross-border payment platform headquartered in Africa. We empower African businesses to settle payments with their international suppliers more swiftly, transparently, and competitively than conventional methods.Having swiftly established our brand in several markets, we are eager to expand our engineering team and continue enhancing the financial infrastructure for FX and cross-border payments across Africa.Role OverviewAs a Senior Backend Engineer, you will collaborate with a skilled team of engineers to develop a wide array of customer-facing products, internal tools, and financial systems. Your contributions will be pivotal in maintaining and enhancing a payment infrastructure that handles millions of euros in transactions daily.Key ResponsibilitiesDesign and implement production-grade HTTP APIs using Golang.Create API integrations with fintech partners.Influence architectural decisions.Establish CI/CD pipelines.Deploy resources and services on Google Cloud Platform.Implement best practices for Site Reliability Engineering (SRE) and security.Conduct comprehensive testing.Utilize AI-driven development methodologies.What We Are Looking ForA minimum of 6 years of backend development experience.Extensive knowledge of Golang.Proficient in working with SQL databases.Experience in managing infrastructure on Google Cloud Platform or other cloud services.Ability to thrive in a fast-paced team environment.Familiarity with large language model (LLM) driven development.Systems Developed at LuoPayA payment platform tailored for businesses in Africa.Internal tools for payment operators, treasury analysts, and FX traders.AI applications for OCR and invoice approval.KYC onboarding processes.Anti-Money Laundering and Transaction Monitoring systems.Core Banking and Ledger Systems.Automated payouts with banking partners.

About the Role Meritis is seeking a C# Developer to join the team in Paris. This position involves working on a range of software projects using C# and related technologies. The team values strong technical skills and a collaborative approach to problem-solving. What You Will Do Develop and maintain software solutions using C# Collaborate with colleagues in an agile setting Contribute to projects that use modern technologies Location This role is based in Paris.

About the Role Meritis is looking for a C# Developer to join the team in Paris. This role involves working on projects that use current technology trends. Collaboration with other experienced professionals is a core part of the job. What You Will Do Develop and maintain applications using C# Work alongside colleagues to deliver technical solutions Contribute to projects that encourage both creativity and technical skill Location This position is based in Paris.

About Meritis Meritis is a consulting firm focused on IT and digital transformation projects. Based in Paris, the team supports clients across various industries with technology-driven solutions. Role Overview: C# Developer (H/F) The C# Developer will contribute to software development projects, building and improving applications in collaboration with colleagues from different disciplines. This role involves hands-on coding, problem-solving, and regular interaction with project teams to meet client needs.

Join Iliad as a Business Developer in Paris and play a crucial role in driving our growth and innovation. In this position, you will be responsible for identifying new business opportunities, building relationships with potential clients, and contributing to the strategic direction of our organization. This is an exciting opportunity for entry-level professionals eager to make a significant impact.

About Us Safran.AI, formerly known as Preligens, is a subsidiary of Safran Electronics & Defense, specializing in artificial intelligence solutions for analyzing high-resolution satellite imagery, full motion video (FMV) streams, and acoustic signals. Our innovative solutions are implemented in the aerospace, defense, and governmental sectors. Since 2016, our company has been developing sophisticated algorithms and software that automatically analyze, detect, and identify military-relevant objects from both commercial and governmental data sources. Following our integration into Safran in September 2024, Safran.AI is also playing a pivotal role in the group’s transformation by applying AI solutions to Industry 4.0 sectors. For example, automated image analysis through AI aids inspectors in identifying potential anomalies in critical components from digital images. At Safran.AI, innovation and the creation of a safer world are at the core of our mission. By joining us, you will collaborate with passionate, multidisciplinary teams (engineers, researchers, developers) among the industry's most talented professionals, all driven by a shared commitment to technological excellence. We provide a stimulating work environment where creativity and initiative are encouraged, and every idea matters. Your Mission, Should You Choose to Accept It As part of Project Robin, an innovative solution for monitoring strategic sites via satellite imagery and AI, already in production with several clients, you will join a team of 7 developers. Together, you will focus on evolving various backend modules with strong scalability and modularization challenges (data pipeline, database, API, orchestration, deployment). Note: The ability to obtain a Defense clearance is mandatory for this position. As a Senior Software Engineer, you will play a central role in bringing your technical expertise to the design, development, and implementation of our complex software solutions. Your responsibilities will include:→ Maintaining and evolving web applications (Python/FastAPI and JavaScript/React).→ Designing, developing, and maintaining our backend infrastructure and automated pipelines (Python, Airflow, PostgreSQL).→ Collaborating closely with all teams and subject matter experts to understand end-user needs.

We are seeking a talented and motivated Android Developer (H/F) to join our dynamic team at myjobcompany1. As an Android Developer, you will play a crucial role in designing and developing innovative mobile applications that enhance user experience. You will collaborate with cross-functional teams to define, design, and ship new features, ensuring high performance and responsiveness of applications.Your expertise will help to shape the mobile landscape of our company, making a direct impact on our products and user satisfaction.

Are you a dynamic and results-driven professional looking for an exciting opportunity in business development? Join Nexton, a leading company in its field, located in the vibrant city of Paris. As a Business Developer (H/F), you will be instrumental in driving growth and expanding our market presence.

Join Meritis as a C# Developer and be part of an innovative team that shapes the future of technology. In this role, you will work on exciting projects, utilizing your expertise in C# to develop high-quality software solutions.

About the Role Meritis is hiring a C# Developer (H/F) for its Paris office. This role focuses on building and improving software applications for a range of client projects. The team values technical skill and a collaborative approach to problem-solving. What You Will Do Develop and maintain applications using C# Work closely with colleagues to deliver solutions that align with client requirements Contribute to the design, coding, and testing of new features Location This position is based in central Paris.

Role Overview Meritis is looking for a C# Developer to help design and build software solutions in Paris. This role involves working closely with colleagues from different specialties to improve our applications and support ongoing technical improvements.

Role Overview Meritis is seeking a C# Developer to join the team in Paris. This role involves working closely with colleagues to build and improve software applications that support the company's goals. What You Will Do Develop and enhance applications using C# Collaborate with team members on project delivery Contribute ideas and technical solutions to support business needs Location This position is based in Paris.

iliad-free is hiring a Lead Golang Developer in Paris. This position guides the development of software projects using Golang, with a focus on quality and technical leadership. Role overview This role centers on leading a development team and shaping the design and implementation of software solutions. The Lead Golang Developer will set standards for code quality and help drive technical decisions. What you will do Lead development projects using Golang Oversee the design and delivery of software solutions Promote high standards in code quality and team collaboration Requirements Professional experience with Golang development Ability to lead and motivate a technical team Strong problem-solving and communication skills

About PreludeAt Prelude, we are pioneering a new standard for user onboarding and authentication in an era where trust, speed, and conversion are paramount.Our innovative solutions streamline user verification, enhancing security and efficiency while transforming authentication into a strategic advantage. Our flagship product boasts the highest price-to-conversion ratio for OTP code delivery, intelligently adapting to utilize the most effective channels in real-time—whether through optimized SMS routing or popular messaging applications like WhatsApp. Additionally, Prelude actively mitigates spam and fraud risks that traditional providers often overlook, thereby safeguarding both profit margins and user experiences.Established in 2022 and supported by prominent venture capital firms, Prelude has rapidly achieved significant market traction and robust financial health, catering to fast-growing companies throughout Europe and making strides into the US market. Authentication is merely the beginning of our journey.With a forward-thinking roadmap and a suite of market-defining products in the pipeline, we are developing a scalable trust platform that empowers businesses to effortlessly onboard users, combat fraud intelligently, and expand confidently across the globe.About Our TeamThe Prelude team consists of former Zenly professionals who have experienced the limitations of current authentication systems firsthand. While developing products that serve millions, we recognized the challenges posed by costly and unreliable SMS authentication, leading to the inception of Prelude.Currently, our team of 40 is based in Paris, dedicated to creating high-performance, secure user onboarding solutions for businesses in Europe and the US. We believe that small, highly skilled teams are more effective than large, fragmented organizations, and we prioritize impact, quality, and agility.We embrace a flat organizational structure that enhances in-person collaboration, facilitating rapid idea exchange, grounded decision-making, and full ownership of our projects.Our core values guide our daily operations:CareWe are deeply invested in our customers, our colleagues, and the quality and reliability of our products.

Join us as a pivotal member of the Backend team at amo, where you'll play a critical role in shaping our infrastructure. In the initial months, you will collaborate closely with the team and gradually take charge of key components and features. At this early stage of our journey, we are in search of adaptable engineers who are eager to contribute across multiple facets of our company’s foundation.We appreciate team members who dive deeply into their areas of expertise, fostering a culture of subject matter mastery within our team. This dedication to specialization is a core expectation for every engineer.Our backend team is responsible for both server-side operations and the backbone of the client, as we believe a unified team can more effectively manage topics like networking, data modeling, management, and synchronization.As a Backend Engineer, your daily responsibilities will include:Building the FutureYou will develop robust systems designed to handle significant traffic, vast amounts of data, and an unparalleled rate of scaling. Your toolkit will include cutting-edge technologies, elegantly crafted code, and systems built for seamless horizontal scaling.Ensuring Cross-Platform CohesionBeyond server-side development, you will be involved in the enhancement and maintenance of a Rust component shared between iOS and Android. This component primarily focuses on networking, data synchronization, and data-oriented feature logic, benefiting from a single codebase. You will collaborate with mobile engineers to ensure a consistent experience across platforms and bridge the gap between mobile development and backend architecture for a cohesive user journey.Innovative Feature DevelopmentEngage in brainstorming sessions to design and implement unique features that distinguish us in the marketplace.Commitment to Continuous ImprovementWe value mutual learning and staying updated with industry trends and emerging technologies, encouraging fresh ideas and contributions to our culture of continuous improvement.Ownership of Your DomainYou will monitor analytics and manage system incidents, taking ownership of your responsibilities and proactively addressing issues and bug fixes.

Overview: We are seeking a talented Product Engineer specializing in Backend Development with Rust to take charge of and enhance the foundational systems that ensure AI safety at a large scale. Your role will involve constructing APIs capable of managing hundreds of millions of requests, implementing real-time policy enforcement, and developing high-throughput data pipelines.About UsWhite Circle is at the forefront of AI Safety, creating the essential safety, reliability, and optimization framework for AI systems. Our platform is built on policies—easily understandable natural-language rules that outline appropriate AI model behavior. We automatically test, enforce, and continuously refine these policies on a massive scale.We have secured $11M in funding from leading investors, founders, and executives from OpenAI, Anthropic, HuggingFace, Mistral, DeepMind, Datadog, Sentry, and others.Our systems process over one hundred million API calls each month.We optimize and train our own LLMs to operate more swiftly and cost-effectively than any publicly available or proprietary models.As a compact and highly focused team, we welcome those eager to tackle challenging problems, deliver their work to production swiftly, and actively shape the future of AI safety.Your Responsibilities:Design and implement backend services in Rust that facilitate real-time policy evaluations at scale, ensuring low latency and high reliability.Take ownership of features from inception to deployment: API design, database schema development, and continuous monitoring and iteration.Engage with different layers of the stack as needed; we prioritize problem-solving over rigid role definitions.Enhance system performance and reliability through connection pooling, caching strategies, query optimization, and observability practices.Collaborate directly with product managers, researchers, and ML teams to convert requirements into effective production systems.Ideal Candidate:You have experience building and deploying backend systems in Rust—beyond mere tutorials, you have real-world production experience.You are well-versed in async Rust (Tokio), web frameworks (Axum, Actix), and database interaction patterns.You possess strong system design fundamentals, capable of assessing trade-offs, failure modes, and scalability.You have hands-on experience with PostgreSQL, adept at crafting efficient queries and designing schemas.