Senior Backend Engineer at reliant-ai | Berlin

🌳 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 passi…

About UsAt reliant-ai, we are dedicated to transforming decision-making in an age of overwhelming information. Our mission is to develop the next generation of machine learning software, leveraging generative AI to analyze critical data sources and deliver comprehensive, factual answers to complex inquiries.We believe that the true potential of generative AI can only be achieved by tackling the world's most significant information challenges. With over two decades of expertise in reinforcement learning and natural language processing, we are poised to make a substantial impact in this field.Our team consists of scientists, builders, and entrepreneurs who have pioneered some of the most influential AI applications. Having led teams at industry giants like Google, DeepMind, and EY Parthenon, we now connect cutting-edge AI research with the biopharma sector.

About coretylyntcoretylynt is revolutionizing the industrial supply chain with an innovative AI-powered trading platform that facilitates seamless connections between vetted suppliers across Asia, Europe, and the GCC region and local demand. Our integrated platform digitizes and automates the entire lifecycle of materials trade, optimizing processes from procurement and pricing to inventory management, logistics, and embedded financing. This automation replaces thousands of manual, relationship-driven tasks, enabling real-time orchestration of supply chains.Our platform provides buyers with instant quotes, dependable availability, and predictable delivery through a unified operating system. Suppliers enjoy precise forecasting, effective demand management, and smooth integration into cross-border fulfillment networks. Partnering with leading brands, we manage both dropship and cross-dock fulfillment for large-scale transactions, transforming global supply chains into predictable, efficient workflows akin to software systems.With strong backing from top-tier investors and institutional financing partners, coretylynt has achieved triple-digit million GMV, operates in six international markets, and is swiftly moving toward profitability. Our team of over 80 professionals, based in Berlin and Asia, is committed to creating the world’s first industrial-grade AI operating system for materials, redefining how global trade functions in one of the world’s largest and most critical industries.Join our dynamic Tech team, where you will collaborate with highly ambitious and knowledgeable engineers, tackle complex challenges, and gain exposure to commercial aspects.Our Tech Stack: Python, LangGraph, LLM APIs (OpenAI, Anthropic, Gemini), AWS, GitHub Actions, Node.js, Java 21 (Spring Boot 3), Postgres, Kinesis, Terraform, Typescript, NextJS, React.

Join our dynamic team at peec as a Senior Backend Engineer, where you will play a crucial role in building and scaling our backend systems. Your responsibilities will include overseeing complex backend architecture, ensuring reliable delivery of high-quality systems, and collaborating with cross-functional teams to create innovative solutions.Key ResponsibilitiesTake ownership of complex backend systems from scoping to architecture and delivery.Design and develop robust, scalable APIs and distributed systems that enhance product performance.Collaborate with Product, Frontend, and Design teams to implement well-structured backend solutions.Drive innovation in backend technologies, enhancing both architecture and developer experience.Support the evolution of our backend infrastructure and developer tools for rapid scaling.Identify and implement improvements for system performance, reliability, and developer experience.

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 commercetools as a Senior Backend Engineer specializing in TypeScript, where you will play a pivotal role in designing and implementing scalable backend services. Collaborate with a talented team to innovate and enhance our platform, ensuring top-notch performance and reliability.

Join our dynamic and innovative team at bitlane as a Senior Backend Developer. We are seeking a passionate software engineer to contribute to our product development journey from conception to deployment and beyond. In this role, you will collaborate closely with project managers and frontend developers to ensure that we meet and exceed our project requirements. The ideal candidate will possess a deep understanding of software engineering principles and industry best practices, delivering clean, maintainable, and error-free code with robust test coverage. You will be responsible for writing automated tests, conducting code reviews, and taking end-to-end ownership of your projects. We value problem solvers with an inquisitive and innovative mindset, ready to leverage their software development skills to create new services. Your role will involve backend development across a variety of projects, ranging from small applications and single-page websites to comprehensive e-commerce systems and complex CRM solutions. If this resonates with your skill set, we look forward to receiving your application!Responsibilities:Collaborate with our software team to design and launch new featuresEnhance our product and codebase with your analytical insightsMaintain our systems at the cutting edge while developing our growing environmentExpand our existing web technology portfolioCreate new microservices using AWS and improve existing onesDevelop and maintain tools for software and data interactionDefine project scope in collaboration with project managersCommunicate your work status and meet deadlines established with project managers

About the Role airapps is looking for a Backend Engineer to help shape backend systems for our applications. This position is based in the Berlin Metropolitan Area. What You Will Do Design and build backend systems that support our products Focus on scalability and performance throughout development Location Berlin Metropolitan Area

About the CompanyAt Affinidi, we are revolutionizing data ownership to empower individuals and businesses. Our technology enables users to take control of their digital identity, ensuring privacy and security while managing their complete digital footprint.We are committed to fostering a trusted ecosystem for decentralized digital identity solutions, allowing seamless data exchange across industries and borders.About the Role:We are looking for a Senior Backend Engineer with expertise in Rust. The ideal candidate will be solution-oriented and possess a strong track record in backend development. You will play a crucial role in our mission to create innovative solutions that enhance data ownership and privacy.

About the CompanyAndercore is an innovative AI-powered trading platform revolutionizing the industrial supply chain for infrastructure, energy, and construction materials. We connect thoroughly vetted suppliers from Asia, Europe, and the GCC region with local demand through a seamless integrated platform.Our proprietary AI technology digitizes and automates the entire lifecycle of materials trade—covering procurement, pricing, inventory management, logistics, and embedded financing—thus transforming countless manual processes into real-time, orchestrated workflows.Buyers enjoy instant quotes, dependable availability, and predictable delivery via our unified operating system. Suppliers benefit from precise forecasting, effective demand management, and smooth integration into cross-border fulfillment networks. We collaborate with leading brands to execute both dropship and cross-dock fulfillment strategies for large-scale transactions, turning global supply chains into predictable, repeatable, software-driven workflows.Having achieved triple-digit million GMV and operating in six international markets, we are swiftly moving towards profitability. With a diverse team of over 80 members based in Berlin and Asia, we are on a mission to build the world’s first industrial-grade AI operating system for materials—redefining the dynamics of global trade in one of the most critical industries.Backed by top-tier investors and global banking partners, we recently secured a $40 million Series B funding round led by Atomico, Project A, and Invent Capital, supported by institutional backing from Commerzbank and KfW.About the RoleAs a Senior Backend Engineer, you will serve as a technical pillar within our team, expected to lead by example, influence architectural decisions, and elevate the quality of our deliverables. You will work autonomously while remaining deeply embedded in a collaborative engineering culture.Tech Stack: Java 21 (Spring Boot 3), Python, LangGraph, LLM APIs (OpenAI, Anthropic, Gemini), PostgreSQL, Kinesis, AWS, Terraform, GitHub Actions, Node.js, TypeScript, Next.js, React.

Your ResponsibilitiesTake ownership of backend systems that facilitate thousands of hotel bookings daily.Design, develop, and maintain our core booking infrastructure, ensuring robust integrations with PMS platforms, channel managers, and payment processors.Define and support a resilient API layer that drives our React frontend applications.Enhance engineering standards by demonstrating exceptional system design, effective communication, and technical leadership.Collaborate closely with the founders to influence the long-term architecture and cultivate a strong engineering culture.

About the CompanyAffinidi is a pioneering technology firm committed to revolutionizing data ownership. We empower both businesses and individuals to take control of their data, offering a holistic approach to managing their digital identities while prioritizing privacy and security.Our innovative technology facilitates decentralized digital identity solutions, ensuring that everyone has the right to own and manage their data. We are dedicated to building a trusted ecosystem for digital credentials that enables secure data and service exchanges across various sectors and borders.About the Role:We are looking for a Senior Backend Engineer (Rust) who is solution-oriented and possesses proven experience in backend development using Rust. You will be responsible for designing, implementing, and maintaining robust backend systems that align with our vision of secure, decentralized data management.

Join a pioneering cybersecurity and AI startup in Berlin!TechBizGlobal is on the lookout for a Founding Backend Engineer (Go) to be an integral part of our founding team, responsible for architecting the essential security, identity, and enforcement frameworks for our cutting-edge AI-driven security risk management platform.Founded by seasoned cybersecurity experts with roots in Israeli Intelligence, we seek a proactive Backend Engineer (Go) to take on a hybrid role based in the heart of Berlin. If you have a passion for cybersecurity and AI technology, excel in dynamic startup environments, and relish the challenge of building complex systems from scratch, this is your chance to make a significant impact.Our mission is to develop a next-generation cyber risk platform that empowers enterprises to comprehend, assess, and mitigate identity risks at scale. We aim to transform intricate identity and security data into straightforward, actionable insights that Chief Information Security Officers (CISOs) and Chief Technology Officers (CTOs) can rely on. From day one, you will collaborate on core platform components, influencing how modern organizations manage and interpret risk through cloud-native systems, AI analytics, and automated enforcement via AI agents.

Role overview Taktile creates technology that enables banks and fintechs to automate critical decisions, such as credit and risk assessments, in real time. As a Senior Backend Engineer on Team Atlas, the main focus is on developing and maintaining the data infrastructure that powers Taktile’s feature computation platform. This position holds responsibility for the full lifecycle of core backend systems, from initial design through deployment, and plays a key role in shaping the direction of the product. What you will do Design, build, and maintain backend services using Python on AWS, including Lambda functions, DynamoDB, Aurora, and event-driven pipelines that support live production workloads. AI tools are part of the regular workflow. Address complex technical challenges related to latency, reliability, and scalability in backend systems. Take ownership of systems end to end: architecture, implementation, deployment, monitoring, and incident response are all part of the role. Influence architectural decisions and help determine how systems are built, not just what gets built. Contribute to team growth by conducting code reviews, mentoring peers, and improving development tools and processes. Collaborate closely with Product and Design teams to help define new features and guide product direction. Location This role is based at Taktile’s office in Berlin.

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.

Have you ever dreamed of being part of a revolutionary change in urban mobility? At Vay, we are redefining transportation by offering a unique service where customers can summon a car at the touch of a button—without a driver inside—thanks to our pioneering Remote Driving technology operating on real public roads.Already operational in Las Vegas, we are rapidly expanding, fueled by a strategic investment of up to $410 million from Grab. Our mission is straightforward: to transform private car ownership into a faster, cleaner, and more convenient door-to-door mobility solution. If you aspire to create something tangible and transformative, you will find a welcoming home here.Want to experience Vay firsthand? Use the code VAYCANDIDATE for $10 off your first trip in Las Vegas! Download the "Vay" app from the Apple or Google Play store and get started!What’s happening at VayWe are the first company to deploy vehicles on public roads in both Europe and the USA without a human driver and currently have the second-largest commercial driverless car fleet in the Western World.We have partnered with Kodiak to integrate our remote-driving technology into autonomous trucks in the US, demonstrating our capacity to adapt our technology for heavy-duty commercial vehicles and broaden its applications across the US.Having completed tens of thousands of trips, we are scaling our Las Vegas fleet to meet growing demand!...And soon, we will be expanding across the US and Europe

About the CompanyThe AI-powered trading platform revolutionizing industrial supply in infrastructure, energy, and construction materials. It seamlessly connects trusted suppliers across Asia, Europe, and the GCC region with local demand through a unified platform.Our proprietary AI technology digitizes and automates the entire lifecycle of materials trade—from procurement and pricing to inventory management, logistics, and integrated financing—eliminating thousands of manual, relationship-dependent processes with real-time orchestration.Buyers receive instant quotes, reliable availability, and predictable delivery through our cohesive operating system. Suppliers enjoy precise forecasting, disciplined demand management, and effortless integration into cross-border fulfillment networks. We partner with prominent brands to facilitate both dropship and cross-dock fulfillment for large-scale transactions, transforming global supply chains into predictable, repeatable, software-like workflows.Supported by top-tier investors and financing partners, we have achieved triple-digit-million GMV, operate across six international markets, and are rapidly moving towards profitability. With a growing team of over 80 individuals based in Berlin (our headquarters) and Asia, we are developing the world’s first industrial-grade AI operating system for materials—redefining the workings of global trade in one of the most substantial and vital industries.

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.

About the CompanyAndercore is an innovative AI-driven trading platform revolutionizing industrial supply chains in sectors such as infrastructure, energy, and construction materials. Our platform seamlessly connects vetted suppliers from Asia, Europe, and the GCC region with local demand, offering a single integrated solution.Leveraging our proprietary AI stack, we digitize and automate the entire lifecycle of materials trade—from procurement and pricing to inventory management, logistics, and embedded financing—eliminating countless manual and relationship-driven processes in favor of real-time orchestration.Our platform provides buyers with instant quotes, dependable availability, and predictable delivery through a unified operating system. Suppliers benefit from precise forecasting, disciplined demand management, and seamless integration into cross-border fulfillment networks. By partnering with leading brands, we facilitate both dropship and cross-dock fulfillment for large-scale transactions, transforming global supply chains into predictable, software-like workflows.Scaling to triple-digit-million GMV and operating in six international markets, we are rapidly moving towards profitability. With a passionate team of over 80 professionals based in Berlin (HQ) and Asia, we are developing the world's first industrial-grade AI operating system for materials, redefining operations in one of the globe's largest and most essential industries.Backed by top-tier investors and global institutional banking partners, we recently secured $40 million in Series B funding from Atomico, Project A, and Invent Capital, with institutional backing from Commerzbank and KfW.Join our tech team and collaborate with a group of ambitious and knowledgeable engineers, tackling complex problems while gaining exposure to commercial aspects.The Tech Stack: Python, LangGraph, LLM APIs (OpenAI, Anthropic, Gemini), AWS, GitHub Actions, Node.js, Java 21 (Spring Boot 3), Postgres, Kinesis, Terraform, Typescript, NextJS, React.

At 8returns, we are revolutionizing the e-commerce landscape by addressing the challenges associated with returns—an aspect that can often be frustrating, environmentally harmful, and expensive.We are trusted by some of the fastest-growing direct-to-consumer brands, including OACE, PEGADOR, and GOT BAG, and have gained recognition from iconic brands like Fielmann, Tommy Hilfiger, and Reebok. Our mission is to innovate the post-purchase experience.As a Senior Backend Software Engineer, you will take ownership of key systems that enhance the speed, reliability, and scalability of our product. From APIs to data models and integrations, you will help transform the chaos of returns into effective margin protection. If you have a passion for clean architecture, love deploying new features, and seek true ownership of your work, then this role is tailored for you.