Senior Fullstack Engineer - Cloud & AI (all genders)

About the RoleWe are on the lookout for two highly skilled backend engineers to join our dynamic team in Berlin. You will be instrumental in advancing the development and implementation of our technology, enhancing our capacity to create core backend functionalities, and empowering other teams to utilize this backend for their projects.If you have a passion for creating exceptional products, thrive in a fast-paced environment, and are eager to contribute to the success of an ambitious startup, this is the perfect opportunity for you.Our Tech Stack:Python / FastAPIPostgreSQL / MongoDB / ElasticCloud LLM providers + bare metal GPUsGCPAs an early team member, you will assume significant responsibilities from day one, with the chance to influence our technological architecture and infrastructure.Join one of the most ambitious AI companies today, collaborating with a world-class team of experts in their fields, and experience an incredibly stimulating work environment. In This Role You WillLead the delivery of complex projects, coordinating with cross-functional teams, and ensuring timely completion of essential components.Develop a deep understanding of Reliant's vision and integrate this into your architectural and process decisions in daily operations.Offer insights to refine UI/UX concepts and assist in the planning of backend and infrastructure development.Take proactive responsibility for long-term code quality and architecture. About YouThe ideal candidate will have a proven track record in backend or full-stack development, with a focus on rapid innovation and effective systems design that supports growth opportunities for both the product and the team.To thrive in this role, you should possess the following skills and experiences:5+ years of demonstrated experience in building backend services or distributed systems.Ability to design, develop, test, and maintain backend services and APIs that support product features, including writing robust, production-quality code.Engage in system and service design; contribute to architectural discussions and make informed trade-offs regarding scalability, latency, cost, and reliability.Navigate ambiguity effectively; translate vague or high-level requirements into actionable implementation plans.Collaborate with cross-functional partners including product management, frontend, UX, data, and operations to define requirements, plan implementations, and deliver features.Ensure high code quality by writing, reviewing, and improving unit/integration tests; actively participate in code reviews.

Role overview repriskag is hiring a Senior AI Engineer based in Berlin. This position centers on designing and building advanced AI solutions aimed at solving complex problems in a range of industries. The work requires a strong technical background and a creative approach to applying AI methods. Collaboration is central to this role. The Senior AI Engineer will work closely with engineers and researchers, sharing ideas and exploring new directions in AI technology. The team values open communication and a willingness to tackle novel challenges together. What you will do Design and implement AI solutions for diverse industry problems Collaborate with engineers and researchers to develop new AI approaches Contribute to discussions on emerging AI technologies and their practical applications Location This role is based in Berlin.

About the Role Join bluefishai as a Senior AI Engineer and take the lead in developing cutting-edge LLM-powered products that redefine marketing and advertising technologies. Your expertise in machine learning, large language models, and natural language processing will be crucial as you design, implement, and enhance our suite of AI-driven solutions. In this pivotal role, you will oversee the LLM technology stack that is central to our product offerings. Collaborate with cross-functional teams, including application engineers, product managers, and designers, to create innovative solutions that yield significant business results. This position offers a unique opportunity to influence the future of AI-driven technologies and contribute to impactful real-world applications. While this role is associated with our Berlin office, we support hybrid or fully remote work arrangements for candidates located within Germany.

Join GetYourGuide as a Senior AI Enablement Engineer, where you will leverage your expertise in artificial intelligence to enhance our product offerings. In this pivotal role, you will collaborate with cross-functional teams, driving the integration of AI technologies into our platforms, ultimately enhancing user experience and operational efficiency.Your contributions will shape the future of travel experiences, directly impacting how customers interact with our services. If you are passionate about AI and ready to make a significant impact in a dynamic environment, we want to hear from you!

Become a part of Voyfai, a rapidly expanding Series A startup redefining logistics and technology throughout Europe.Located in the vibrant city of Berlin, we are at the heart of a diverse portfolio of companies engaging across multiple European markets.This is an exceptional opportunity to take the reins from the outset, create significant impact, and develop your career in an agile, fast-moving atmosphere. Whether you’re optimizing processes, formulating strategies, or spearheading initiatives, your efforts will directly contribute to the success of Voyfai and the enterprises we empower. If you have a passion for building innovative solutions and wish to join a rising star, we encourage you to reach out!Your RoleAs a Senior AI Engineer at Voyfai, you will be instrumental in crafting, developing, and scaling LLM-driven and applied GenAI systems that enhance our main offerings. You will collaborate closely with Product, Engineering, and Business teams to convert complex, unstructured challenges into effective, production-ready AI solutions.This role is hands-on and focused on delivering tangible results. You will take full ownership from identifying use cases and designing prompts or models to deploying, monitoring, and continuously improving systems in production, with a strong emphasis on real-world reliability and business outcomes.Key Responsibilities:Design, develop, and implement LLM-driven and GenAI features for impactful, real-world applications.Build and manage end-to-end GenAI pipelines, encompassing prompt design, model selection or fine-tuning, evaluation, and deployment.Integrate foundational models into production systems, prioritizing latency, cost-efficiency, reliability, and quality.Collaborate with Product Managers and Engineers to convert vague business challenges into scalable AI solutions.Oversee production AI systems, including monitoring, evaluation, guardrails, and feedback mechanisms.Contribute to architectural choices regarding AI platforms, retrieval systems, vector databases, and LLMOps tooling.Elevate the technical standard through code quality, documentation, and mentorship.What You Bring:Several years of experience as an AI Engineer, Machine Learning Engineer, or in a related role, with a hands-on focus on LLMs and applied GenAI in operational environments.Strong grasp of LLM behavior, prompting techniques, evaluation strategies, and common failure modes.Proven track record of successfully implementing AI solutions that drive business value.

At Intercom, we revolutionize customer service with our cutting-edge AI technology. Our mission is to empower businesses to deliver exceptional customer experiences.Our AI agent, Fin, stands as the most sophisticated customer service AI on the market, enabling businesses to provide round-the-clock, flawless service. Fin integrates seamlessly with our Helpdesk, forming the comprehensive Intercom Customer Service Suite, designed to enhance support for complex inquiries that necessitate human intervention.Since our inception in 2011, we have gained the trust of nearly 30,000 businesses globally, establishing a new benchmark in customer service. Our core values drive us to innovate, operate with urgency, and consistently provide exceptional value to our clients.We are excited to build our presence in Berlin, a city known for its unique mix of top-tier technical talent and vibrant creative culture. This dynamic, globally connected metropolis is conveniently located near our R&D facilities in Dublin and London, making it an ideal hub for ambitious product development.This year, we aim to recruit 100 talented individuals in Berlin across various domains, including engineering, AI, data science, product management, and design. This is an extraordinary opportunity to join us as we lay the groundwork for our R&D efforts in the region and make a significant impact as we develop the leading customer service AI!What’s the opportunity?We are in search of Senior Product Engineers to become part of our AI Infrastructure team, dedicated to building AI-driven products at Intercom. As a Product Engineer in AI Infrastructure, you will collaborate closely with ML engineers and ML scientists to thoroughly understand our products and tech stack, and identify ways to expedite our development processes.The broader AI team is responsible for conceptualizing new ML features, exploring effective algorithms and technologies, and swiftly deploying prototypes for our customers.Our AI infrastructure is designed to adapt rapidly to new advancements in AI, ensuring that our engineers can deliver high-quality services promptly while maintaining the safety and reliability of our systems.We are passionate about leveraging machine learning technology, from classic supervised models to innovative unsupervised clustering algorithms, and pioneering new applications.

Join our innovative team at akirolabs as a Senior AI Engineer, where you'll play a crucial role in designing and implementing cutting-edge artificial intelligence solutions. We are looking for a passionate individual who thrives in a dynamic environment and is ready to take on challenging projects that push the boundaries of technology.

Join Arbio, a pioneering AI-driven hospitality company, and be part of our mission to revolutionize short-term rentals across Europe.At Arbio, we leverage cutting-edge technology to enhance efficiency, elevate guest experiences, and streamline operations in the short-term rental sector. Our rapidly growing team is dedicated to shaping the future of hospitality with innovative AI solutions, all while fostering a culture of performance and accountability. Come aboard and help us lead the industry into a new era of growth and innovation.As a Senior AI Engineer, you will be instrumental in developing the intelligence framework that underpins our operations, from property management to guest services. We are focused on creating advanced Retrieval-Augmented Generation (RAG) systems that convert disparate data into immediate, actionable insights, empowering our teams to provide world-class guest experiences.Your contributions will include:Designing high-performance RAG pipelines utilizing MongoDB Vector DB for rapid semantic search capabilities.Building agent workflows based on LangChain for complex reasoning tasks.Integrating various LLM providers such as Claude, OpenAI, and Gemini.Writing maintainable and scalable TypeScript code to facilitate our growth.Monitoring and optimizing using LangSmith and other LLMOps tools.Collaborating with a dynamic, agile team to push the boundaries of AI in the hospitality field.

Role Overview Cosuno is looking for a Senior AI Engineer to join the AI team, working from Berlin or remotely. This role focuses on building and refining the intelligent systems that drive Cosuno’s platform for the construction industry. What You Will Do AI Agent Development: Design and improve intelligent agent systems that handle the complex tendering process using multi-step reasoning. End-to-End Product Integration: Own feature delivery across the stack, from model and API to the TypeScript front-end, making sure new capabilities fit smoothly into the web application. Ranking, Search, and Retrieval: Improve systems for subcontractor matching and marketplace search, focusing on ranking and retrieval performance. Price Prediction: Enhance models that estimate fair pricing for construction projects, helping users evaluate bids and make procurement decisions. Experimentation and Evaluation: Run offline evaluations, set up A/B tests, and use metrics to guide iterative improvements. Cross-Team Collaboration: Work closely with Product, Engineering, and Data teams to turn business challenges into meaningful ML and AI solutions. Production ML and AI Maintenance: Monitor, alert, and continuously improve all deployed machine learning and AI systems.

At Intercom, we are revolutionizing customer service through innovative AI solutions, striving to empower businesses to deliver exceptional customer experiences.Our flagship AI agent, Fin, is the most advanced customer service AI available, enabling businesses to provide round-the-clock, flawless service and significantly enhance customer interactions. Fin seamlessly integrates with our Helpdesk, creating an all-encompassing solution known as the Intercom Customer Service Suite, designed to tackle complex queries that necessitate human intervention.Founded in 2011 and trusted by nearly 30,000 businesses worldwide, Intercom is setting a new benchmark for customer service. Our core values drive us to push boundaries, operate with speed, and deliver unparalleled value to our clients.We believe in the importance of speed, and Berlin epitomizes this with its unique combination of technical expertise and vibrant creative culture. It is a globally connected city, closely situated to our R&D hubs in Dublin and London, making it the ideal environment for top-tier technical talent to flourish and collaborate on ambitious projects.This year, we aim to expand our Berlin team by hiring 100 professionals in engineering, AI, data science, product, and design. Joining us now means becoming part of the foundational R&D team in this region, allowing you to leave a lasting impact as we develop the world's leading customer agent!What’s the opportunity?We are seeking Senior Product Engineers to join our AI Group, focusing on the development of Intercom’s AI-driven products. As a Product Engineer in machine learning, you will collaborate closely with our ML Scientists and product teams, gaining a deep understanding of our products, customer needs, and our ML tech stack.Your role will involve defining innovative ML features, researching suitable algorithms, and rapidly deploying prototypes to our customers. Our team is highly product-focused, working in partnership with Product and Design teams to expedite our production processes. Thanks to our dedicated engineering team, we frequently transition from successful offline tests to production within weeks.We are passionate about leveraging machine learning technology, having productized everything from classic supervised models to groundbreaking unsupervised clustering algorithms and transformative applications of transformer neural networks. We rigorously test and measure the real customer impact of every model we implement.

About RealistRealist is a pioneering WealthTech startup located in Germany, dedicated to revolutionizing the financial sector with state-of-the-art technology, insightful data analytics, and robust financial infrastructure. As we enhance our platform and technological capabilities, we are in search of a seasoned Senior Software Engineer to join our expanding team in Berlin and contribute to the creation of next-generation financial systems.About the RoleIn the capacity of Senior Software Engineer, you will be instrumental in designing and developing high-performance financial systems that efficiently handle vast quantities of data in a secure manner. You will collaborate closely with product, engineering, and data teams to architect scalable systems and aid in the development of intelligent, AI-driven financial applications.This position demands substantial experience in backend engineering, distributed systems, and data-intensive architectures, combined with a mindset conducive to a dynamic startup environment. We are particularly interested in candidates who are quick learners, capable of swiftly adapting to new technologies and evolving challenges.Key ResponsibilitiesDesign, develop, and maintain scalable backend systems that support data-intensive financial applications.Build and optimize high-performance OLTP systems for transaction-heavy workloads.Contribute to system architecture and design, ensuring reliability, scalability, and maintainability.

Intercom builds AI-powered customer service tools for businesses worldwide. Our flagship AI agent, Fin, helps companies deliver responsive support at any hour. Combined with our Helpdesk, these tools form the Intercom Customer Service Suite, which blends AI automation with human expertise for more complex questions. Since 2011, nearly 30,000 businesses have relied on Intercom to improve their customer experience. Our team values fast iteration, continuous learning, and delivering real value to clients. Role overview Intercom is hiring Senior AI Infrastructure Engineers in Berlin to design and scale the systems behind our next generation of AI products. The AI Infrastructure team works across the stack, from GPU-level programming to the user-facing agents that handle millions of support conversations each month. This group builds and maintains training pipelines and inference systems for custom models like Fin Apex, which are central to our AI offerings. Collaboration with a tight-knit, highly skilled team is part of the role. What you will do Develop and scale training pipelines for large transformer and LLM models, including data ingestion, preprocessing, distributed training, and evaluation. Build and optimize inference services for low-latency, reliable customer experiences, covering autoscaling, request routing, and fallback mechanisms. Improve GPU-level performance by tuning kernels, increasing utilization, and identifying bottlenecks across both training and inference stacks. Work closely with machine learning scientists to implement new training and inference techniques. What we look for Demonstrated experience in model training or inference at scale, with strong skills in low-level GPU programming (such as CUDA or Triton). Experience across multiple areas is a bonus.

Intercom builds AI-driven customer service tools that help businesses offer strong support experiences. Our AI agent, Fin, powers always-on customer care and integrates with the Intercom Helpdesk as part of the Customer Service Suite. This platform handles complex queries and connects customers to human support when needed. Since 2011, nearly 30,000 businesses have chosen Intercom to improve their customer service operations. Role Overview The Senior Engineering Manager, Fin AI Agent, joins the Service Agent pillar in Berlin. This pillar includes 12 teams and continues to grow. The role involves leading one or two of the most strategically important work streams within this group. Team structures shift frequently, so flexibility and adaptability are essential. The broader market moves quickly, with AI-focused startups competing for the same ground, so high standards and comfort with rapid change are key. What You Will Do Own critical work streams from start to finish, ensuring meaningful impact beyond just meeting deadlines or maintaining team morale. Engage directly with the product and its challenges, this could include writing code, performing analyses, collaborating across functions, or helping team members overcome blockers. Form and lead new teams as priorities shift, often bringing together engineers who have not worked together before. Set clear expectations and build momentum, even under tight deadlines. Measure success by the real-world results your teams achieve. Who Thrives Here This role suits someone who enjoys high-pressure, fast-moving environments and is motivated by delivering real results. The work demands strong leadership, adaptability, and a willingness to get involved directly in technical and organizational challenges.

Role Overview bluefishai is searching for a Senior Staff Applied AI Engineer based in Berlin or working remotely within Germany. This senior technical leader will shape how artificial intelligence is adopted and scaled across the company. The position focuses on driving AI projects that improve developer productivity, streamline workflows, and grow product capabilities. What You Will Do Lead AI-driven initiatives from concept to implementation, targeting real business outcomes. Work directly with the VP of Engineering and partner with engineering, product, and leadership teams to identify and prioritize impactful AI use cases. Establish structure, standards, and clear processes to help teams use AI effectively and sustainably. Integrate AI solutions into software development workflows to help teams deliver faster and more efficiently. Evaluate new and emerging technologies, including advanced AI capabilities, and advise on their practical application for both products and internal operations. Mentor engineers across teams, define best practices, and support the adoption of AI to drive measurable improvements. What Makes This Role Unique bluefishai is at the early stage of its AI journey, with multiple teams exploring different approaches. This role offers the chance to bring clarity, consistency, and vision, helping set the foundation for scalable AI use across the company. Success depends on strong collaboration, influencing stakeholders, and aligning teams around solutions that deliver real results.

Transform the Travel ExperienceJoin GetYourGuide in reshaping the travel landscape by connecting individuals to extraordinary experiences around the globe. Since our inception in 2009, millions have relied on us to book unique activities across over 12,000 cities. With our headquarters in Berlin and 16 additional local offices worldwide, we're dedicated to making travel memorable.Are you ready to be part of a diverse community of over 850 passionate explorers committed to revolutionizing the travel experience? Visit our careers page to learn more.Our Team's MissionSince 2020, GetYourGuide has developed a Machine Learning (ML) Platform team focused on equipping our Data Products team with essential tools and best practices for building and maintaining robust, production-ready ML/AI systems. Recently rebranded as the AI Platform Team, our mission is to empower diverse teams and various ML/AI use cases through self-service tools and automation.As a Senior MLOps Engineer, you will become a vital member of our AI Platform Team, significantly impacting all our data products. Collaborating closely with Data Products teams, you will help build systems that facilitate the deployment of ML/AI algorithms. If you're eager to contribute to a product utilized by millions of travelers globally, we invite you to continue reading.

Join Our Mission to Transform HealthcareBe part of a dedicated team of innovators at Doctolib as we revolutionize healthcare accessibility!As a member of our tech department, you will play a key role in creating cutting-edge products and features that enhance the lives of healthcare professionals and patients alike. We thrive in an agile environment, collaborating closely with product, design, and business teams.Your Role as a Senior AI EngineerWe are seeking a Senior AI Engineer (Python) to join our Conversational AI (CAI) team within the Practice Efficiency domain.In this position, your primary goal will be to develop and expand our Phone Assistant product, aiming to transform patient access to care and streamline daily operations for practitioners. Leverage state-of-the-art technologies in AI, NLP, and speech recognition to create exceptional user experiences and scale your innovations to millions of users.

Join idealo’s innovative AI Booster Team, where we drive the integration of generative AI technology across the organization. Collaborate closely with product teams to create reusable AI workflows and promote industry best practices. In this role, you will be pivotal in designing and deploying scalable LLM systems and agentic workflows, transforming concepts into rapid production rollouts.About Your New RoleWork together with cross-functional teams to conceptualize, prototype, and launch LLM-driven features within weeks.Design and implement sophisticated LLM workflows and agentic systems, including multi-agent orchestration and execution flows.Assess and choose appropriate models and inference infrastructures for tasks, balancing considerations of cost, latency, quality, and safety.Create reusable AI components (e.g., advanced RAG pipelines, evaluation frameworks, model adapters) that can be scaled across various products and teams.Promote automated evaluations, human-in-the-loop assessments, and continuous feedback loops to maintain quality, reliability, and cost efficiency.Act as a technical mentor by conducting office hours, reviews, and workshops to elevate GenAI skills throughout idealo.

Senior Product Engineer (AI Agents) Permanent Position, Full-time · Berlin (Hybrid) MAKE A MEANINGFUL IMPACT At charles, we empower numerous brands to connect with their loyal customers through engaging conversations every day, whether it’s socks, pet food, or cosmetics. As a Senior Product Engineer at charles, you will play a pivotal role in advancing our product and infrastructure, driving the transformation of conversational AI. You will collaborate with engineers, product managers, and designers to develop scalable, high-performance systems that address real customer needs. Your work will lead to dependable, data-driven solutions that cater to millions of users, pushing the frontiers of AI-driven messaging commerce. YOUR KEY RESPONSIBILITIES Identify and tackle high-impact challenges, utilizing product and business insights to prioritize effectively. Develop and refine AI-enhanced conversational features, leveraging LLMs to foster meaningful customer interactions. Enhance the Charles API to integrate messaging capabilities with CRMs, CDPs, and shop systems. Create clear, maintainable documentation and uphold the integrity of well-tested code. Monitor system performance and implement data-driven enhancements. Conduct code reviews with peers and contribute to the overall growth of the company. Break down product initiatives into manageable technical tasks and accurately estimate the workload. IDEAL CANDIDATE PROFILE 5+ years of experience in software engineering. Proficiency in Node.js and TypeScript (preferred) or another high-level programming language such as Java, Go, Rust, or Python. Strong product and business acumen: A keen understanding of customer needs, focusing on solving the right problems rather than just building technically intriguing solutions. Experience or a strong interest in working with LLMs and AI to develop products (prompt engineering, AI APIs, understanding practical limitations). Experience deploying and managing applications on cloud platforms, preferably GCP. A testing-focused mindset with strong monitoring abilities and the capacity to write reliable, scalable code. Data-driven decision-making skills and creativity in tackling challenges. Excellent communication skills, capable of effectively conveying technical concepts to both technical and non-technical stakeholders. Mentoring abilities to foster team growth as we expand.

Delivery Hero is looking for a Senior Python AI Engineer to focus on logistics, data, and machine learning projects in Berlin. This position centers on developing AI-powered tools that support and improve delivery operations. Role overview This role involves designing and building applications using Python, with a strong emphasis on artificial intelligence and data science. The main goal is to create solutions that make logistics processes more efficient and help raise customer satisfaction. What you will do Develop and maintain AI-driven applications tailored for logistics challenges Apply machine learning techniques to optimize delivery workflows Work closely with teams to identify and solve data-related problems Requirements Extensive experience with Python Background in artificial intelligence, data science, and machine learning Ability to build solutions that improve operational efficiency