Jobs in Germany

About Mistral

Mistral provides full-stack AI solutions: from frontier models to developer tools, applications, and compute. We partner with enterprises tackling the hardest problems across high-stakes industries like finance, manufacturing, defense, healthcare, and the public sector, co-creating customized AI systems that they can run on their terms.

We are a dynamic, collaborative team passionate about AI and its potential to transform society. Our diverse workforce thrives in competitive environments and is committed to driving innovation. Our teams are distributed between Europe, North America, Asia and the Middle East. We are creative, low-ego and team-spirited.

About the role

Join Mistral AI’s Defense team to build software for defense institutions and industry.

We are looking for an experienced software engineer with strong engineering fundamentals and a background in data engineering or transactional, analytical or distributed systems. You will help shape the architecture, write production code and own substantial software components, from design through deployment and operation.

This role offers the scope and autonomy of a senior technical individual contributor in a small team. It is particularly suited to engineers operating at Senior or Staff level in demanding product engineering environments who want broad ownership and to stay deeply involved in implementation.

What you will do

• Design and build services for data ingestion, transformation, storage, querying and operational workflows.

• Develop shared data models, APIs and SDKs that help engineers build applications on a consistent foundation.

• Make authorization a core part of the architecture: define and enforce which users, applications and agents can access data or perform actions, with clear audit trails.

• Solve problems involving data consistency, schema evolution, concurrency, performance and failure recovery across services and data systems.

• Turn needs from our applied engineers and defense users into reusable software capabilities, making pragmatic choices about what to build and how to evolve them.

• Own delivery end to end, including implementation, testing, observability, debugging and maintainability in demanding deployment environments.

• Use AI coding tools and coding agents extensively to accelerate implementation, testing, refactoring and debugging. Help the team improve these workflows while maintaining a high engineering standard.

What we are looking for

• Strong practical familiarity with AI coding tools and agentic engineering workflows. You use coding agents regularly, can break complex work into well-scoped tasks, provide effective context, review generated code and validate the result through tests and debugging. You remain accountable for the architecture, correctness, security and maintainability of what you ship.

• A strong track record of building and operating production software, with substantial ownership of complex systems.

• Experience in data engineering or in building transactional, analytical or distributed systems. You understand the trade-offs behind data models, storage, query execution and service boundaries.

• Experience building products where access control, permissions and data governance are central to how the system works. Work on platforms such as Foundry, or systems with comparable requirements, is particularly relevant.

• Broad software engineering skills and the ability to move between architecture, implementation and production debugging. You are comfortable working across unfamiliar parts of a codebase.

• Strong proficiency in Python or another programming language, solid SQL skills and the ability to become productive quickly in a Python and TypeScript environment.

• High autonomy and sound judgment: you can turn an ambiguous problem into a concrete plan, make technical decisions and deliver useful increments with limited supervision.

• A collaborative approach to technical leadership through code, design discussions, reviews and mentoring, and a clear motivation to build software for defense institutions and industry.

Nice to have

• Experience building a data platform or developer product used by other engineering teams.

• Experience with fine-grained authorization, multi-tenant architectures, data lineage or auditable operational workflows.

• Experience with self-hosted software, restricted networks or other demanding deployment constraints.

• Familiarity with LLM applications and their integration with data and tools.

What We Offer

We offer a comprehensive benefits package designed to support your well-being, growth, and work-life balance. Benefits vary by country and may include healthcare coverage, parental leave, retirement plans, relocation support, wellness programs, meal and transportation allowances, and other location-specific perks.

For the most up-to-date details on benefits available in your location, please refer to our Benefits page.

Privacy Policy

Your privacy matters to us. You can learn more about how we handle your personal data in our Applicant Privacy Policy.

Find more English Speaking Jobs in France on Arbeitnow

Swarm Aero is redefining air power, building the largest swarming UAV and the most versatile swarming aircraft network in the world. The company is moving quickly to launch the first aircraft designed specifically for swarming, as well as the Command & Control software to mobilize swarms of thousands of heterogeneous autonomous assets and empower human operators to achieve superhuman results.

The team has created and exited multiple startups, negotiated defense deals worth billions of dollars, and designed and built 30+ novel aircraft, with aerospace experience from Scaled Composites, Airbus, Archer Aviation, Blue Origin, and Boom Supersonic.

Legion's Command & Control platform lets a single operator plan, direct, and execute missions across a networked swarm of heterogeneous aircraft, in real time, over intermittent comms, at a scale nobody else in the industry is attempting. That means distributed state under unreliable networks, dense telemetry moving fast enough to strain anything you've built before, and interfaces for a problem space that barely has prior art. You'll work across the stack, wherever the hard problem is that week.

WHAT YOU'LL DO

• Build and ship features in the C2 system that directs swarms of heterogeneous aircraft

• Work on systems that hold state and stay responsive when comms degrade or drop entirely

• Move between the interface layer and the services behind it, following the problem rather than a job description

• Prototype new ways to represent and control vehicle telemetry, sensor data, and scheduling

• Take features end to end, from a rough problem statement through design, implementation, and deployment

• Ship early and often, backed by strong CI/CD, QA, and DevSecOps

WHAT WE'RE LOOKING FOR

• Degree in Computer Science, a related technical field, or equivalent self-taught depth

• Real strength in fundamentals: data structures, algorithms, concurrency, networking, systems

• Evidence you've built something hard because you wanted to. A renderer, an emulator, a game, a compiler, a multiplayer server, a robotics project, a serious open source contribution. We care more about what you've built than where you worked

• Comfort writing code at more than one layer of the stack, and no strong attachment to staying at one

• Willingness to work on problems where the right answer isn't known yet, and to be wrong in public on the way to finding it

WHAT SETS YOU APART

• Competitive programming background (ICPC, IOI, Codeforces, USACO, Putnam)

• Game development, game jams, engine work, or simulation

• Performance-sensitive work: profiling, frame budgets, memory pressure, running on constrained hardware

• Real-time or distributed systems experience: multiplayer netcode, streaming, pub/sub, robotics middleware

• Graphics: WebGL, OpenGL, Vulkan, shaders

• Working fluency in Go, C++, or Rust

• Familiarity with video streaming protocols or geospatial applications

WHY THIS ROLE

You'll be one of the earliest engineers shaping how humans command autonomous systems at scale, work that's currently being defined in real time, by a small team, with your fingerprints on the architecture. If you want to build the future of human-swarm interaction rather than maintain someone else's, this is that seat.

ITAR requirement

To conform to U.S. Government export regulations, applicant must be a U.S. citizen, lawful permanent resident of the U.S., protected individual as defined by 8 U.S.C. 1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State.

Swarm Aero is an equal opportunity employer. We value diverse backgrounds and experiences and make employment decisions without regard to race, religion, national origin, gender, sexual orientation, age, veteran status, or disability.

What We Offer

• Meaningful equity in a high-growth defense technology company

• Competitive base salary commensurate with experience

• Medical, dental, vision, and 401k

• PTO and paid sick leave

• Monthly wellness stipend

• Daily catered lunch (office)

• Paid parental leave

• Direct impact on a critical national security mission

• A world-class team of engineers and operators solving genuinely hard problems

Compensation: $170K – $220K

• • $170K – $220K

Find Jobs in France on Arbeitnow

We’re a team of experts pushing the limits of what’s possible, united by our common goal to unlock true freedom through digital ownership, making technology accessible for all. We believe in a world where users, creators and enterprises manage their value with ownership and freedom. Our curiosity drives us to innovate, empowering individuals on a global scale. We believe change is constant and our team moves forward as one, with a culture of problem-solving where every employee is empowered and supported to challenge tradition and create solutions. Our mission is simple: to make self-custody accessible and give people the keys to their own financial futures. If you want to make a true impact, we want you to join us at Ledger.

At Ledger, we’re proud to be the global platform for digital assets and Web3, with over 20% of the world’s crypto assets secured through our Ledger devices. With our headquarters in Paris, and offices in Vierzon, Grenoble, Montpellier, London, Portland, Geneva, Zurich and Central Singapore, we have a team of around 600 professionals developing a variety of products and services to enable individuals and companies to securely buy, store, swap, grow and manage crypto assets – including the Ledger hardware wallets line with more than 7.5 millions units already sold in 200 countries.

The team:

You'll join the Data Team, responsible for turning data into actionable insights and recommendations for our consumer sales and marketing operations across all channels.

What you’ll be doing:

• Own analytics across the full consumer sales scope: Ledger.com e-commerce, Amazon marketplaces, wholesale and resellers/distributors - covering both sell-in and sell-out- with one consistent view of revenue, units and margin reconciled in Snowflake, our source of truth

• Develop and improve data models (dbt/Snowflake) across varied data sources (sales, sell-out, marketing, web analytics) with the support of the data engineering team; co-own data quality alerting (SKU, refunds, sales anomalies)

• Build and maintain Tableau dashboards for business stakeholders: e-commerce performance, wholesale, resellers sell-out, affiliation, editorial content, shipping costs

• Own the measurement of performance marketing channels - SEM / Google Ads, affiliation & retargeting, Amazon Ads: spend, revenue attribution, ROAS/CAC across GA4, ad platforms and internal sales data, reconciling discrepancies between sources

• Measure the true impact of pricing, promotional and marketing campaigns using causal inference methods (CausalImpact, pre-post, control/synthetic groups) and recommend budget arbitrations to the Growth team

• Model customer value (LTV, repurchase behavior, services attach) and feed it back into marketing ROI decisions

• Contribute to cross-functional data projects (Salesforce data model, new data source integrations) and leverage AI tooling (Claude, LLM-based workflows) to scale analytics delivery

• Create and deliver presentations that turn complex analyses into clear recommendations for stakeholders up to ExCom level

What we’re looking for:

• Strong SQL and dbt skills (Snowflake)

• Python for analysis and statistics; experience with causal inference methods is a strong plus

• Strong Tableau skills

• Familiarity with marketing/web analytics data: GA4, ad platforms (Google Ads, Amazon Ads), affiliation networks

• 3-4 years of experience in data analytics/analytics engineering

• Data driven and business oriented; able to challenge stakeholders' methodology

• Excellent organizational skills, fluent in English

At Ledger, we are dedicated to continually investing in our employees which is why we offer more than just salaries; we provide comprehensive compensation packages that include a wide range of benefits. Here are some of the benefits you can look forward to:

• Flexible work options - Our hybrid policy allows employees to work from home up to 3 times per week

• Health & Wellness support - Health and Life Insurance.

• Financial growth opportunities - Employees can become shareholders in Ledger as well as other financial benefits depending on your country of work.

• Commuter allowance - Ledger offers a commuter allowance to contribute to your preferred means of transportation.

• Learning & Development - A comprehensive suite of training solutions providing a personalised learning experience for every employee.

For regionally specific benefits, your Talent Acquisition contact will be able to provide you with more information.

We’re committed to building an inclusive hiring process. If you need any adjustments or accommodations, just let us know, we’ll do our best to support you.

Find Jobs in France on Arbeitnow

Quandela stands as a global leader in quantum computing, driven by groundbreaking technology and a strategic vision for scaling quantum solutions. The company’s unique ability to offer both hardware and software solutions, along with its commitment to build energy efficient datacenters and scalability, positions it to play a key role in the next wave of innovation, and in many strategic and sovereign industrial sectors. 

Join Us at the Forefront of Quantum Computing Innovation 🚀

About this position:

We are looking for a R&D Engineer - Optical Systems & Single-Photon Source Lithography to support the development of novel designs of Single Photon Sources (SPS) for Quandela’s SPS R&D department.  

This position combines advanced optical experiments, hands-on R&D, and manufacturing engineering. The SPSL Engineer will play a key role in the fabrication of new designs of SPSs, that will be further tested by colleagues on characterization testbenches. 

The role will have a strong focus on in-situ localization of quantum dots (QDs) at cryogenic temperatures and lithography over the localized QDs with laser writing techniques. The successful candidate will work closely with our SPS R&D team, SPS production team, fabrication engineers, equipment owners, and cleanroom operators to improve performance of the SPSs and successfully transfer R&D advances to our production mainline. 

This is a highly hands-on position requiring a strong understanding of optics and semiconductor fabrication, rigorous experimental methodology, and the ability to investigate complex interactions between process parameters and device performance. 

Key responsibilities

• Improving SPS performance 
• Develop, optimize and stabilize QD positioning and laser lithography process on R&D “experimental” epitaxial wafer growths with high-performance potential. 
• Contribute to the development of GUIs and automation software in the Python programming language. 
• Contribute to the development of fully automated QD-positioning and lithography tools on complex, “experimental” epitaxial wafer growths. 
• Define process windows, recipes, operating conditions and acceptance criteria. 
• Improve process repeatability, reproducibility, robustness, and within-wafer / wafer-to-wafer homogeneity. 
• R&D to Production Transfer 
• Prepare processes and equipment for increasing wafer sizes, batch sizes, and production volumes. 
• Assess manufacturability, scalability and process risks before transferring to production. 
• Define qualification plans and acceptance criteria before releasing new or modified processes to production. 
• Support technology transfer through clear documentation, operator training, and technical communication. 
• Detect process drifts, investigate deviations, and define corrective and preventive actions. 
• Equipment & Production Support 
• Contribute to the development of novel fabrication setups, both on the hardware and software side. 
• Work closely with equipment suppliers and internal teams to resolve technical issues. 
• Contribute to a safe, disciplined and efficient cleanroom environment. 
• Process Characterization & Data Analysis 
• Develop appropriate data analysis tools to identify process sensitivities, and optimization opportunities. 
• Search and analyze scientific and technical literature to support experiments development and troubleshooting. 
• Documentation & Communication 
• Ensure frequent and clear reporting of experimental results, risks and improvement actions. 
• Communicate effectively with colleagues from different technical backgrounds and levels of experience. 

Requirements

Required Qualifications & Experience :

• Master's degree or PhD in Optics, Materials Science, Physics, Micro/Nanotechnology, Electrical Engineering, or a related field. 

• Hands-on experience with semiconductor or photonic device fabrication in a cleanroom environment. 

• Hands-on experience in design, assembling, and alignment of optical systems. 

• Hands-on experience in design, assembling, and operation of electronic devices 

• Python programming language fluency. 

• Excellent attention to detail and a rigorous approach to experimental work. 

• Strong troubleshooting, root-cause analysis, and problem-solving skills. 

• Ability to independently investigate technical problems using experimental data and scientific literature. 

• Strong communication and documentation skills. 

• Fluent English, both written and spoken. 

Preferred Qualifications :

• Experience in development of GUIs with the Python programming language. 

• Good understanding of quantum physics in general and more specifically of quantum optics. 

• Experience with process industrialization and transfer from R&D to production. 

• Experience with III-V semiconductor devices, particularly AlGaAs-based photonic structures, resonators, or VCSEL-type technologies. 

We are looking for someone who combines the mindset of an R&D engineer with the rigor of a manufacturing/process engineer. 

The ideal candidate is comfortable developing new systems where all parameters are not yet fully understood, while also being able to transform experimental processes into stable, controlled and documented production workflows. 

You should enjoy working directly in the cleanroom, analyzing data, developing Python projects, solving complex fabrication problems, and collaborating across R&D and production teams.

Benefits

• Competitive salary, flexible based on your experience
• Profit-sharing & company savings plan
• 100% health coverage (Alan)
• 50% transport reimbursement or sustainable mobility bonus
• Meal vouchers (Swile), Gymlib fitness support
• Childcare assistance & referral bonuses (€1,000–€2,000)

What we offer:

• A meaningful role with real ownership, from day one
• A team eager to collaborate and grow with you
• Daily exposure to the entire quantum stack — from high-level APIs to low-level firmware, and everything in between.
  

Process

• Talent Acquisition Interview (30' - 45')
• Hiring Manager Interview (45')
• Use Case / Practical Assessment : The use case will consist of a simple practical exercise focused on the alignment of an optical bench. The assessment will take place in the cleanroom, they are not considered PPE for this exercise.
• Meeting with the teams
• 2 reference check
• Offer

(This process is provided for guidance only and may evolve depending on the roles)

At Quandela, we believe that the strength of our team is the plurality of experiences, perspectives, and journeys. We are committed to building a respectful, inclusive, and welcoming work environment. All applications are welcome. 

Find more English Speaking Jobs in France on Arbeitnow

About Quandela

Quandela is a global leader in photonic quantum computing, developing hardware and software technologies to build scalable and energy-efficient quantum systems.

With more than 140 people, we develop our own stack, from semiconductor quantum emitters and photonic integrated circuits to quantum control systems, software and algorithms.

Our ambition is to build large-scale fault-tolerant quantum computers. Reaching this scale requires increasingly reliable, manufacturable and integrated photonic hardware, making our Integrated Photonics team a key part of this journey.

About this position:

You will join our Integrated Photonics team, working across Massy and Palaiseau at the interface between PIC design, characterization, packaging and system integration.

We are looking for a hands-on Photonic Packaging Engineer to take ownership of our packaging activities, improve existing processes and help make our PIC integration more reliable and reproducible.

Your first priority will be to contribute to ongoing packaging activities, develop and improve assembly processes, and troubleshoot integration challenges alongside our PIC design and characterization teams.

As you grow into the role, you will also have the opportunity to develop new packaging approaches, coordinate technical projects and contribute to building more structured and scalable packaging capabilities.

Why this role matters:

Today, packaging activities involve several members of our team. Having a dedicated engineer will help us accelerate ongoing developments, improve the reproducibility of our processes and strengthen the connection between PIC design, characterization and system integration.

As our PIC platforms evolve, your work will also contribute to developing new integration approaches and preparing our packaging processes for future scale-up.

Requirements

What will you do:

Develop and improve photonic packaging processes:

• Take ownership of ongoing packaging activities and improve existing processes.
• Develop optical coupling, precision alignment and fiber-array attachment methods.
• Work on component assembly, bonding and electrical interconnections.
• Address mechanical and thermal integration challenges.
• Test new approaches, troubleshoot issues and improve process reproducibility.

Qualify and improve packaged devices:

• Build and test prototypes to validate packaging approaches.
• Define performance metrics, tolerances and acceptance criteria.
• Characterize packaged PICs alongside the PIC Characterization team.
• Troubleshoot optical, electrical and mechanical integration issues.
• Establish repeatable procedures and technical documentation.

Connect packaging with PIC design:

• Work closely with PIC Designers to anticipate packaging constraints.
• Translate assembly challenges into practical design-for-packaging guidelines.
• Collaborate with characterization and system-integration teams to improve packaged device performance.

Build the packaging capability:

• Collaborate with external packaging partners and equipment suppliers.
• Improve existing equipment, assembly methods and internal capabilities.
• Explore new packaging technologies and integration approaches.
• Support automation to improve accuracy, reproducibility and throughput.
• Progressively lead technical projects and contribute to future scale-up.

How you'll grow:

0–3 months → Get familiar with our PIC platforms, existing packaging processes and integration challenges. Contribute to ongoing activities and start taking ownership of selected technical tasks.

3–6 months → Take increasing responsibility for packaging processes, develop and test improvements, and contribute to making our assembly methods more reliable and reproducible.

6–12 months → Lead packaging development activities within your area of expertise, strengthen our qualification and documentation practices, and contribute to new packaging approaches and technical projects.

Longer term → Depending on your experience and interests, grow into a broader technical role, leading packaging projects, strengthening external partnerships and helping shape our future packaging capabilities.

--

What we're looking for:

Must-have:

• Master's or PhD in Photonics, Physics, Engineering, Microelectronics or related fields.
• Hands-on experience in photonic, optoelectronic or semiconductor packaging.
• Practical experience in optical alignment, component assembly or related processes.
• Good understanding of packaging tolerances, process development and qualification.
• Ability to troubleshoot integration issues and develop reliable packaging solutions.
• Professional English.

Important, but you can grow here

• Fiber-array / FAU attachment and fiber-to-chip coupling
• Wire bonding, flip-chip integration or other electrical interconnection techniques.
• Design for packaging, assembly and manufacturability
• Mechanical and thermal integration
• Experience working with external packaging suppliers or technology partners
• Automation of packaging or precision-assembly processes

Bonus

• Packaging of integrated photonic devices
• Experience with active photonic or optoelectronic components.
• Cryogenic packaging
• High-density electrical interconnection
• Semiconductor production, process-engineering or NPI experience
• Experience developping packaging equipment
• Previous experience coordinating technical projects or leading packaging development activities.

> You do not need previous experience in quantum computing.

> What matters most is your ability to work hands-on with packaging processes, understand integration challenges and help us develop reliable and reproducible solutions.

Benefits

Join a growing quantum hardware company and contribute directly to the development of next-generation photonic quantum processors.

• Take ownership of key PIC packaging activities and processes.
• Develop reliable and reproducible packaging solutions.
• Grow your expertise and contribute to future packaging developments.
• Collaborate with PIC design, characterization and integration teams.
• Work across photonics, semiconductor packaging and quantum hardware.
-
• Competitive compensation aligned with your experience and level of responsibility
• Company savings plan
• 100% health coverage (Alan)
• Transport reimbursement or mobility bonus
• Swile meal vouchers
• Access to Gymlib

If your background is slightly different from what is described above but you bring strong hands-on experience in photonic, optoelectronic or semiconductor packaging, we still encourage you to apply.

Find Jobs in France on Arbeitnow