Senior Software Engineer in AI at Realist | Berlin

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.

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.

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.

Cresta is dedicated to transforming every customer interaction into a strategic advantage by harnessing the full potential of contact centers. Our innovative platform merges cutting-edge AI with human expertise, enabling contact centers to uncover valuable customer insights, streamline conversations and processes, and empower team members to operate more efficiently. Founded by Sebastian Thrun, a visionary from the Stanford AI lab and the mastermind behind Google X, Waymo, and Udacity, our leadership team includes CEO Ping Wu, co-founder of Google Contact Center AI, alongside Tim Shi, an early member of OpenAI. We have gathered a stellar team of AI and machine learning specialists, market leaders, and esteemed investors such as Andreessen Horowitz, Greylock Partners, and Sequoia, along with former AT&T CEO John Donovan. Our esteemed clientele features renowned brands like Intuit, Cox Communications, Hilton, and Carmax, and we have been honored by Forbes and Bain Consulting as one of the premier private AI companies globally. Embark on an exhilarating journey with us as we revolutionize the contact center workforce through AI. The future of work is here, and it begins at Cresta!

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.

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.

About UsAt Perk, formerly known as TravelPerk, we are revolutionizing the way businesses handle travel and spend management. Our intelligent platform is designed to eliminate tedious manual tasks that hinder productivity, automating everything from travel bookings to expense management and invoice processing. By addressing the significant issue of shadow work, we aim to restore lost hours, enhance workplace morale, and ignite innovation.With over 10,000 companies, including industry leaders like Wise, On Running, Breitling, and Fabletics, relying on us, we are tackling the staggering $1.7 trillion problem of lost productivity in the workplace. Founded in 2015, Perk has expanded to a vibrant team of over 1,800 professionals across 12 global offices, with our headquarters situated in London and Boston. Our mission is to integrate innovation, control, and simplicity, transforming the work experience for businesses and their employees.Our core values emphasize ownership, delivering exceptional experiences, and working collaboratively as one unified team. We believe in fostering curiosity and a meaningful mindset to unlock your full potential. Our talent team comprises top minds from both the travel and SaaS sectors, representing more than 70 countries. If you are passionate about making a tangible impact and shaping how millions experience work, we invite you to join our team.To explore more about us, visit www.perk.com.

At Upvest, we are dedicated to our mission of simplifying the investment process to match the ease of daily spending. Our platform empowers businesses to provide a diverse array of investment products and an unparalleled experience in capital market investments and retirement planning. With our user-friendly Investment API, fintech companies and financial institutions can seamlessly integrate solutions, allowing them to concentrate on their primary operations.We are proud to collaborate with leading fintechs and financial institutions in Europe, including DKB, Revolut, N26, and Raisin. Established in 2017 by Martin Kassing, Upvest is comprised of over 270 skilled professionals from more than 70 nationalities. We are supported by prestigious investors including Hedosophia, Sapphire, Bessemer Venture Partners, BlackRock, Earlybird, HV Capital, Notion Capital, and Motive Ventures.

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.

scalablegmbh is seeking an AI Software Engineer with a strong background in Python to join the team in Berlin. This position centers on building AI solutions that support a range of projects and drive progress within the company. Role overview The AI Software Engineer will use Python to design and implement AI-driven features. Collaboration with colleagues is essential, as projects often require joint problem-solving and creative thinking. The work involves addressing technical challenges and contributing to the ongoing development of AI technologies at scalablegmbh. What you will do Develop AI solutions using Python Work closely with team members to deliver project goals Contribute ideas and technical expertise to shape future AI initiatives Requirements Experience with Python in AI-focused projects Enjoy working in a collaborative setting Motivation to solve complex problems and advance AI technology

At Intercom, we are revolutionizing customer service with AI technology, enabling businesses to deliver exceptional customer experiences.Our flagship AI agent, Fin, stands out as the most advanced tool available, ensuring businesses can provide seamless, always-on customer support. When paired with our Helpdesk, it transforms into the Intercom Customer Service Suite, offering AI-enhanced assistance for more complex queries that necessitate human intervention.Founded in 2011, Intercom serves nearly 30,000 global clients, setting a new benchmark in customer service excellence. Guided by our core values, we continually push limits, innovate with urgency, and deliver remarkable value to our customers.Berlin is a city that embodies the speed and creativity we value at Intercom. It boasts a unique blend of deep technical expertise and vibrant culture, making it an ideal location for innovative minds. Our proximity to R&D hubs in Dublin and London further enhances our collaborative spirit, attracting top talent eager to create groundbreaking products.We are on a mission to expand our Berlin team by hiring 100 professionals in the upcoming year across engineering, AI, data science, product management, and design. This is a prime opportunity to join us as foundational R&D talent in the region and make a significant impact as we strive to build the world’s leading customer agent!What is the opportunity?As a Software Engineer at Intercom, you will be at the forefront of solving real customer challenges through the smart and efficient application of your technical skills. You will collaborate with multidisciplinary product teams to develop both back-end and front-end systems, working closely with designers, product managers, researchers, and data analysts.We are navigating exciting scaling challenges and are constructing a robust platform where your expertise will be essential in areas like building a user-friendly messenger composer, rule matching, security, app availability, and machine learning, among others.What will I be doing?As an experienced engineer, your responsibilities will include:

Join Mirelo AI, a pioneering force in creative technology that transforms video content through realistic sound, speech, and music generation.We are at the forefront of generative AI, crafting innovative foundational models that 'unmute' silent videos, delivering custom, hyper-realistic audio tailored for gaming, video platforms, and content creators. Our groundbreaking technology empowers storytellers worldwide to elevate their narratives.Having successfully secured a $41 million Seed round co-led by Andreessen Horowitz and Index Ventures, with contributions from Atlantic, we're experiencing rapid growth across our Product, Engineering, Go-to-Market, and Growth teams.About the RoleAs a Full-Stack Software Engineer at Mirelo, you'll be an integral part of our dynamic, fast-paced team, developing tangible products based on our advanced generative audio models. This position emphasizes hands-on involvement and significant ownership: you'll be responsible for delivering end-to-end features throughout our tech stack, collaborating directly with research and product teams, and influencing the practical application of our technology for users and partners alike. As we enhance our go-to-market strategies, your engineering contributions will play a vital role in both user-facing products and intricate integrations with various platforms, tools, and enterprise collaborators.Key ResponsibilitiesDesigning and maintaining our innovative products leveraging cutting-edge generative AI models for audio and music.Take full ownership of delivering end-to-end features across both front-end and back-end systems, while also guiding the trajectory of the features and products you develop.Engage closely with our research and sales teams; stay attuned to user needs, identify practical opportunities, and convert them into actionable engineering tasks.Utilize our existing tech stack effectively: TypeScript, React, Tailwind, shadcn, and Convex for backend development.Implement essential cloud services—primarily AWS Lambda and S3—for seamless integrations, automation, and deployment workflows.Leverage modern AI-assisted development tools (e.g., Cursor, Claude Code) to expedite processes while maintaining high-quality craftsmanship.Foster clear communication with team members, actively participate in discussions, and collaboratively drive the technical direction.Ideal Candidate ProfileA minimum of 5 years of professional web development experience, ideally in dynamic product or startup environments.Proven expertise in front-end frameworks such as React and back-end technologies.Strong understanding of cloud services, particularly AWS.Excellent problem-solving skills and a collaborative mindset.A passion for technology and a desire to contribute to transformative projects.

Cresta is revolutionizing the way customer conversations are transformed into a competitive advantage, harnessing the full potential of contact centers. Our innovative platform merges cutting-edge AI with human insight, enabling contact centers to unveil valuable customer insights, streamline communication processes, and empower teams to excel. Founded by Sebastian Thrun, renowned for his work with Google X, Waymo, and Udacity, we are guided by a leadership team that includes Ping Wu, co-founder of Google Contact Center AI and Vertex AI platform. We pride ourselves on having a stellar team of AI and ML professionals, strategic market leaders, and esteemed investors including Andreessen Horowitz, Greylock Partners, Sequoia, and former AT&T CEO John Donovan. Our esteemed clients include industry leaders like Intuit, Cox Communications, Hilton, and Carmax, and we've received accolades from Forbes and Bain Consulting as one of the world’s top private AI firms. Join us on this exciting journey to reshape the workforce with AI. The future of work begins at Cresta.About the Role:We are on the lookout for a meticulous and proactive Software Engineer in Test to enrich our engineering team in Berlin, Germany. This pivotal role is dedicated to ensuring the reliability, scalability, and superior quality of our software solutions, with a strong emphasis on constructing, enhancing, and managing our automated testing ecosystem. While proficiency in manual testing is valuable, this position is intended for an individual who will predominantly engage in coding, advancing automation, and developing internal tools. The ideal candidate is someone who can autonomously determine testing strategies, take ownership of significant projects, and contribute to elevating quality standards across the organization.

About Us Zeta Global (NYSE: ZETA) stands at the forefront of marketing innovation as an AI-Powered Marketing Cloud. We harness cutting-edge artificial intelligence and vast consumer data to empower marketers in acquiring, nurturing, and retaining customers more effectively. Through our Zeta Marketing Platform (ZMP), we aim to simplify complex marketing strategies by integrating identity, intelligence, and omnichannel activation into one cohesive solution, supported by one of the industry’s most extensive proprietary databases. Our enterprise clients from various sectors can deliver personalized consumer experiences across all channels, achieving superior marketing outcomes. Founded in 2007 by David A. Steinberg and John Sculley, we are headquartered in New York City with offices worldwide. Discover more at www.zetaglobal.com. The Role As a Senior Software Engineer, you will lead technical initiatives within the team responsible for architecting, developing, and managing the Addressability segment of the Zeta Marketing Platform. You will work closely with engineers, product managers, and executives to define a strategic roadmap and execute projects that will create the next generation of comprehensive, multichannel marketing solutions, enabling data integration across digital touchpoints and enhancing marketing ROI. This role involves designing and developing real-time systems within the Zeta Marketing Platform and LiveIntent, focusing on technologies that facilitate access to our core Identity Solutions. You will also mentor a team of developers through knowledge-sharing sessions that enhance their skills and expertise. The ideal candidate will possess a deep understanding of distributed systems and cloud architecture, extensive design and development experience, and a passion for working with large-scale data while crafting reliable low-latency data processing systems. This is a hybrid position based in our Berlin office.

About UsAt telli, we are pioneering the development of the first AI-native phone system. Since our inception at Y Combinator, the esteemed investors behind renowned companies like Airbnb, Stripe, and Coinbase, we have successfully achieved an impressive annualized revenue of >$2M with a compact team of just 12 talented individuals.Many organizations struggle with customer communication, not due to a lack of care, but because they are overwhelmed by the volume of calls. This often leads to the reliance on substandard outsourced call centers or internal teams spending excessive time on repetitive calls.With telli, our clients utilize AI voice agents to manage their routine calls, empowering human agents to concentrate on high-priority interactions. This translates to enhanced efficiency, satisfied teams, and superior customer experiences.Traditional phone systems were not built for an AI-first landscape. Hence, we are designing the premier AI-native phone system, enabling companies to oversee both their human and AI teams through a single platform.Having managed a 150-person internal call center at Enpal, our founding team possesses deep insights into the challenges and costs associated with providing high-quality customer experiences via phone communication.We are just getting started! Our mission is to enable every company to deliver an exceptional customer experience by eliminating the era of low-quality call centers.About the RoleThis position offers high ownership and significant impact for engineers who prioritize speed and the resolution of genuine customer challenges. You will not merely write code; you will oversee projects from inception to completion, influence core product and architectural choices, and help shape the future of our company.We are committed to assembling a small but highly effective engineering team. As we grow, we intend to maintain a lean core team, relying on engineers who can significantly influence the company’s trajectory.To thrive in this role, you should be comfortable working across various components of our tech stack. One week you may enhance the user experience of our frontend, while the next week you could delve into the asynchronous processing intricacies of our voice AI infrastructure. If you prefer to focus solely on a particular technology or aspect of the product, this role may not be the ideal fit for you.

Who We AreHelsing is an innovative defense AI company dedicated to safeguarding democracies. Our goal is to achieve technological excellence, enabling open societies to make autonomous choices and uphold their ethical standards.As a democratic entity, we recognize our unique responsibility to thoughtfully develop and implement advanced technologies such as AI. We take this duty very seriously.Our team consists of driven engineers, AI specialists, and customer-oriented program managers. We are on the lookout for purpose-driven individuals to join our European teams and apply their expertise to tackle some of the most complex and impactful challenges. We foster an open and transparent culture that encourages healthy discussions on the use of technology in defense, its advantages, and its ethical considerations.The RoleAt Helsing, we are focused on creating and delivering AI-driven solutions and the necessary infrastructure that enables semi-autonomous platforms to localize, navigate, and perceive their surroundings in real time. We engineer software that must adhere to strict and unconventional technical limitations, function across diverse and rapidly changing environments, and accommodate an expanding array of challenging applications. Our work ultimately supports individuals operating in high-risk, high-pressure scenarios, necessitating reliability and ease of use. This offers a plethora of intriguing engineering challenges across various fields that you will help us address. Here are some examples:

Legal teams often find themselves overwhelmed by monotonous tasks, causing delays across the organization. At Flank, we are revolutionizing this scenario.We operate at the forefront of AI innovation, developing the next generation of autonomous agents tailored for enterprises. We have successfully secured a $10M Series A funding round led by Insight Partners (US), with ongoing support from Gradient Ventures (Google’s AI fund), HV Capital, and Speedinvest (EU).Our solution is not merely an optional tool for small startups; we are actively deploying Flank agents within multinational corporations exceeding 100,000 employees, fully automating workflows that were previously deemed unsolvable. Our agents function continuously, under defined parameters with customer oversight, escalating only exceptions to legal for evaluation. Every action and request is transparent and auditable, assuring customers complete visibility over their automated workforce.We are on the lookout for a skilled AI Engineer to spearhead our applied AI projects.In our dynamic startup environment, you will collaborate closely with product, design, and commercial teams to deliver tangible AI solutions — moving beyond mere research experiments.Your responsibilities will include harnessing emerging technologies alongside a team of legal experts to enhance the intelligence and autonomy of our agents.This role may involve the creation of an evaluation framework in partnership with our legal team, or developing a hypervisor that governs each aspect of our agentic system, ensuring alignment with best practices in legal AI systems.

P-1327 At Databricks, we are driven by a passion for empowering data teams to tackle some of the world’s most complex challenges. From revolutionizing transportation methods to speeding up medical innovations, our mission is to build and operate the leading data and AI infrastructure platform, enabling our customers to leverage profound data insights to enhance their business. Established by engineers, Databricks is embarking on an ambitious journey to develop the most advanced Lakehouse Platform. While we have a solid foundation, we aim to elevate our offerings to create significantly improved products. Our goal is to reimagine every component to provide our customers with the fastest, most user-friendly, and secure data platform for all their data workloads. As a Senior Software Engineer, you will be a key member of our Berlin site and play a pivotal role in our multi-year mission to realize our Lakehouse vision. You will engage in the entire development lifecycle and embody the core values of Databricks. The impact you will have: Our backend teams operate across various domains within our essential service platforms. You may encounter challenges such as: Addressing issues that encompass product development and infrastructure, including distributed systems, scalable service architecture, monitoring, workflow orchestration, and enhancing developer experience. Creating reliable, secure, and high-performance services and client libraries for managing and accessing massive amounts of data on cloud storage solutions, such as AWS S3, GCS, and Azure Blob Store. Developing product features that empower our customers to efficiently store and access their data.

Role Overview enpal is hiring a Director of Software Engineering in Berlin. This leadership role guides the engineering team as they build new software products. The position shapes technical direction, manages project delivery, and maintains a focus on quality that serves customer needs.

About UsPerk (formerly TravelPerk) is a cutting-edge platform for travel and expense management, designed to eliminate cumbersome manual tasks that hinder productivity. Our innovative tools automate processes ranging from travel bookings to expense reporting and invoice management, allowing businesses to focus on what truly matters.With over 10,000 clients globally, including renowned brands like Wise, On Running, Breitling, and Fabletics, we are addressing the staggering $1.7 trillion issue of lost productivity, with each employee wasting an average of 7 hours each week on shadow work.Established in 2015, Perk has grown to a vibrant team of over 1,800 professionals across 12 international offices, with headquarters located in London and Boston. Our mission is to transform workplace dynamics through simplicity, innovation, and control.We are committed to our core values of ownership, delivering exceptional experiences, and teamwork. At Perk, we believe in nurturing curiosity, purpose, and the right mindset to unlock potential. Our diverse talent pool comprises leading experts from the travel and SaaS sectors, representing more than 70 countries. If you are driven to make a significant impact and enhance how millions experience work, consider joining us.Visit www.perk.com to discover more.