Staff Software Developer (Kotlin Libraries)

At JetBrains, we are driven by a passion for code. Since our inception in 2000, we've dedicated ourselves to crafting the most powerful and efficient developer tools available. As AI-driven coding agents become integral to Kotlin development, we are committed to ensuring these tools excel in their purpose. The Kotlin AI Value Stream team plays a pivotal role in how AI agents comprehend, generate, and enhance Kotlin code across diverse platforms, including Android, Kotlin Multiplatform, server-side, web, and desktop applications. We develop evaluation infrastructures, error analysis tools, and post-training pipelines that assess and enhance agent performance on actual Kotlin developer tasks. In your role as a Research Engineer with our team, you will take charge of the complete feedback loop: Analyze failures in Kotlin code generated by agents, devise evaluations to identify those failures, research and implement strategies for improvement, and measure the outcomes. Your contributions will significantly influence how millions of developers interact with Kotlin through AI coding agents.

JetBrains s.r.o. creates tools that help developers automate repetitive tasks so they can focus on writing quality code. Since 2000, the company has aimed to make software development more productive and enjoyable for engineers worldwide. Role overview The Customer Success Engineer - Kotlin Multiplatform (KMP) supports engineering teams as they adopt KMP in real-world projects. This role guides organizations from their first evaluation through to successful deployment. Along the way, it gathers feedback and collaborates closely with JetBrains product teams to help shape the future of KMP. What you will do Work directly with organizations at various stages of KMP adoption, from initial exploration to production rollout. Assist teams in migrating, integrating, and scaling shared codebases using Kotlin Multiplatform. Support teams moving from experimentation to production and help address technical challenges as they arise. Reach out to potential users who could benefit from adopting KMP. Identify each customer’s technical needs, use cases, and any barriers to adoption. Advise on architecture, feasibility, and strategies for implementing KMP. Collect structured feedback and insights from clients. Collaborate with JetBrains product and engineering teams to influence the KMP roadmap and improve available tooling. Common questions you'll help solve What is the safest way to migrate a large Android app to shared logic? How much code sharing is practical or advisable? How can teams address resistance from iOS developers working with Kotlin APIs? What’s the best way to organize a codebase for collaboration across teams? How can teams resolve slower build times after introducing KMP? How success is measured Organizations deliver Kotlin Multiplatform in production environments. Teams increase their use of shared code over time. KMP adoption continues beyond initial trials. User feedback results in tangible improvements to KMP and its tooling. Requirements Experience working with Kotlin, either for Android or backend development. Understanding of mobile architectures on both Android and iOS, especially with Kotlin. Strong communication skills and a knack for problem solving. Background with cloud technologies and CI/CD pipelines. Ability to collaborate effectively within a team-driven environment. Location This position is available in Amsterdam (Netherlands), Berlin or Munich (Germany), or remote within Germany.

Welcome to Cradle BioAt Cradle Bio, we recognize that proteins serve as the essential molecular machinery of life, facilitating a diverse range of therapeutic, diagnostic, chemical, agricultural, and food applications. The intricate process of designing and optimizing proteins necessitates extensive expert knowledge and meticulous manual effort, utilizing bespoke computational and biological tools.With the advent of machine learning, we are witnessing a transformative revolution in this domain, allowing for the creation of highly accurate protein models. Cradle offers a cutting-edge software platform that empowers AI-guided discovery and optimization of proteins, enabling biologists to design proteins more rapidly and at scale. Our innovative platform is already trusted by a variety of clients across biopharma, biotech, agri-tech, food-tech, and academic sectors.Our team comprises approximately 75 experienced professionals who have successfully developed numerous products in the past and possess sufficient funding to sustain operations for several years. With primary offices located in Zurich and Amsterdam, we prioritize cultivating an exceptional team culture.We provide our employees with a highly competitive salary package, a generous equity stake in the company, and a comprehensive array of benefits and opportunities for career advancement.

About Flexport Flexport works to simplify international trade, aiming to make it more accessible and efficient for businesses worldwide. Each year, the company helps move over $19 billion in goods across 112 countries. Backed by leading investors, Flexport uses technology and a skilled team to address challenges in global supply chains, impacting business operations, society, and the environment. Role Overview: Staff Software Engineer – Applied AI Flexport’s Applied AI team is building AI agents that anticipate issues, optimize shipment routes, and keep goods moving efficiently. These systems are designed to automate logistics while involving experts at key decision points. Early results show strong promise, and the team is focused on creating supply chains that run with greater autonomy. This position is for those who want to shape the future of global logistics through technology. This role goes beyond standard engineering work. The Staff Software Engineer will identify high-impact problems, design creative solutions, and implement them for freight operators working across 112 countries. What You Will Do Develop and launch end-to-end AI agents that handle real-world logistics tasks, including customs compliance, document processing, and exception management. Work closely with teams across the company to understand challenges, align stakeholders, and drive solutions independently. Move quickly from idea to production, treating each deployment as a learning opportunity. Engage with operators, subject matter experts, and leadership to turn complex, ambiguous problems into practical solutions. Location Amsterdam, Netherlands

Join Adyen as a Staff Software Engineer At Adyen, we are the financial technology platform of choice for premier enterprises, delivering an integrated solution for payments, data, and financial products to global giants such as Meta, Uber, and H&M. We pride ourselves on fostering an ambitious environment where our talented individuals can flourish, supported by a culture that values ownership and collaboration. Here, you will work alongside motivated peers to tackle unique technical challenges on a grand scale, crafting innovative and ethical solutions that empower businesses to reach their goals more swiftly. About the Role We are on the lookout for an exceptionally skilled and passionate Staff Software Engineer to join our dynamic team. The ideal candidate will possess a robust background in developing reliable, scalable, and low-latency systems, with hands-on experience in applying Machine Learning (ML) solutions. In this pivotal role, you will be integral to the design, development, and scaling of systems that harness ML to address real-world business challenges. If you are driven by curiosity about emerging technologies, eager to expand your knowledge, and enthusiastic about leveraging technology as a practical tool to create significant business impact, then this is the role for you. You will thrive in an environment that emphasizes innovation, continuous learning, and teamwork. The Opportunity Adyen is enhancing its capabilities in data-driven risk management to effectively combat financial crime and fraud across our platform. Operating at a massive global scale, we empower businesses worldwide to accept payments, issue cards, and integrate financial products, thus enabling millions of entrepreneurs to conduct business with reduced friction. As we pivot towards a more comprehensive approach to proactively detect and mitigate financial crime and fraud, your contributions will be vital. Key Responsibilities Design and implement robust, scalable software systems that seamlessly integrate Machine Learning models into production environments. Work closely with product managers, data scientists, and business stakeholders to comprehend business issues and convert them into effective technical solutions. Assess and embrace new technologies, frameworks, and tools, driving their adoption where beneficial to tackle real business challenges. Mentor and support junior engineers, fostering their growth and development within the team.

Established in 2015, Shield AI is an innovative venture-backed company at the forefront of deep-tech, dedicated to safeguarding both service members and civilians through cutting-edge intelligent systems. Our product offerings include the advanced V-BAT and X-BAT aircraft, along with the comprehensive Hivemind Enterprise and Hivemind Vision product lines. With a strong presence across the U.S., Europe, the Middle East, and the Asia-Pacific, Shield AI's technology is pivotal in supporting global operations. For further insights, please visit www.shield.ai. Connect with Shield AI on LinkedIn, X, Instagram, and YouTube. The Senior Staff Engineer for Software Autonomy Applications will leverage their technical expertise to provide crucial support to customers during the deployment and utilization of Shield AI's enterprise software solutions. This role requires close collaboration with clients to fully understand their unique requirements, ensuring seamless product integration for AI and autonomy development initiatives.

At JetBrains, we are deeply passionate about code. Since our inception in 2000, we have been dedicated to creating the most powerful and effective developer tools available. By automating mundane tasks and ensuring precision in coding, we empower developers to innovate, explore, and create. The IntelliJ Platform serves as the backbone of JetBrains IDEs, fostering innovation and enabling millions of developers globally to reach their full potential. We are actively seeking a Senior Staff Software Developer to join our IntelliJ Platform team and contribute to the development of features and enhancements that transform productivity in software development.

P-1319 At Databricks, we are driven by a passion for empowering data teams to tackle some of the world’s most challenging problems — from realizing the next mode of transportation to expediting groundbreaking medical advancements. We achieve this by developing and maintaining the premier data and AI infrastructure platform, enabling our clients to harness deep data insights to enhance their operations. Founded by engineers who prioritize customer needs, we embrace every opportunity to address technical challenges, whether that involves crafting next-generation UI/UX for data interaction or scaling our services across millions of virtual machines. And this is just the beginning. Our Developer Experience team is committed to ensuring Databricks engineers are both satisfied and exceptionally productive. We create the tools, processes, and infrastructure that significantly enhance engineering velocity as Databricks continues to grow. The ideal candidate will possess a blend of technical proficiency in various language toolchains (Scala, Rust, Python), build systems (particularly Bazel), compilers, version control systems, testing, and most importantly, a passion for improving developer experiences, complemented by a practical approach to delivering results incrementally.

JetBrains has developed tools for software teams since 2000. By automating routine checks and corrections, JetBrains products help developers focus on building and shipping software. The goal: make development more productive and creative. Role overview This Backend Customer Success Engineer role centers on supporting engineering teams as they adopt Kotlin for backend development. The position focuses on helping organizations successfully bring Kotlin into production environments. What you will do Guide organizations through the process of moving from Java to Kotlin, assisting with migration, integration, and scaling. Troubleshoot technical challenges that arise during the transition and support teams as they progress from initial experimentation to stable production use. Work with potential users to clarify how Kotlin adoption works and help design migration plans that fit their specific needs. Locations Amsterdam, Netherlands Berlin, Germany Munich, Germany Prague, Czech Republic Remote, Germany

Please note that this opportunity requires relocation to our Milan office.About SatispaySatispay is on a mission to transform everyday payments, making them straightforward, equitable, and accessible for everyone. Our vision extends beyond payments; we aspire to redefine the future of finance. As a movement, we're empowering millions, united by a common goal of addressing significant challenges in the financial landscape. We're just at the beginning of this exciting journey.We thrive on agility, bold thinking, and a culture of trust where we challenge the status quo, fostering learning and growth at every step. If you seek more than just another job, if you're eager to create something significant alongside a talented team, you’ve found your place!Your RoleAs a Staff Software Engineer within the Consumer Wealth team, you will take on a pivotal and strategic role in shaping how our users cultivate and manage their savings and investments. As the primary technical authority in the Consumer domain, you’ll lead initiatives that empower millions to enhance their financial well-being through our innovative savings products and investment solutions.Daily Responsibilities:Define Technical Strategy: Craft the technical strategy for the Consumer Wealth sector, architecting intricate subsystems that facilitate savings and investment features while considering cross-product impacts, leading efficient initiatives that benefit multiple teams.Advance Architecture: Design and implement scalable, high-performance systems that address complex financial engineering challenges, streamlining sophisticated back-end systems for savings and wealth management.Technical Thought Leadership: Establish cross-departmental relationships to ensure technical coherence, articulating the technical vision both internally and externally, while keeping abreast of emerging trends in FinTech and wealth management.Develop Talent: Nurture the next generation of technical leaders and advocate for a culture of top-tier engineering and continuous enhancement.Generate Impact: Contribute significantly to helping users grow their wealth and achieve their financial aspirations through your work on the Consumer Wealth back-end infrastructure, directly supporting Satispay's mission.Prepare for challenges, collaboration, and the opportunity to realize your ideas. Our tech stack includes a variety of advanced technologies.

About UsAt Vandebron, we are revolutionizing the energy sector by prioritizing sustainability and creating a transparent platform that connects consumers directly with local green energy producers. Since our inception in 2014, we have been committed to fostering a sustainable energy future.As we enter Chapter 2 of our journey, our mission is to guarantee 100% availability of green energy - 100% of the time. We are implementing innovative solutions such as flexible wind and solar energy utilization, Smart EV Charging, and advanced energy storage systems, ensuring a proactive approach to shaping a green future.Join us in creating smart energy solutions - that’s Vandebron.The RoleWe are rethinking our technology infrastructure, and we want you to be part of this exciting transition! As a Senior Backend Engineer, you will play an essential role as we move from a Scala/ZIO foundation to a new generation of services built with Kotlin and Spring Boot. You will be instrumental in developing our future-proof platform, creating scalable and high-quality services that drive Vandebron’s mission for 100% green energy.Collaborating within a dynamic, cross-functional team of engineers, designers, and product stakeholders, you will transform complex energy challenges into efficient backend solutions. Our culture promotes knowledge sharing and experiential learning, making it an integral part of our work environment.ResponsibilitiesCollaborate with fellow engineers to design and develop new microservices utilizing Kotlin and Spring Boot.Design and uphold clean, high-performing APIs that cater to our React and React Native frontends.Produce clean, efficient, and well-documented code that meets our product specifications with increasing autonomy.Engage in all phases of the development lifecycle, including writing tests, conducting code reviews, and ensuring the delivery of high-quality software.Contribute ideas and feedback within your team to cultivate a collaborative and productive work environment.

At Databricks, we are dedicated to empowering data teams to address some of the most pressing challenges in the world, ranging from security threat detection to advancements in cancer drug development. We achieve this by creating and maintaining the world’s most sophisticated data and AI infrastructure platform, allowing our clients to concentrate on the critical challenges inherent to their missions. Our engineering teams design and implement highly technical products that meet genuine, significant needs globally. We operate one of the largest software platforms, comprising millions of virtual machines that generate terabytes of logs and process exabytes of data daily. Given our scale, we consistently encounter cloud hardware, network, and operating system faults, and our software must effectively shield our customers from these issues. The Delta DML team is responsible for the core write-path operations of Delta Lake, the open-source storage layer that underpins the Databricks Lakehouse. Our goal is to provide unparalleled performance and a seamless user experience at an enormous scale, with the majority of data written in Databricks flowing through our platform. We spearhead performance innovations such as Low Shuffle Merge and Deletion Vectors, while actively contributing to open-source initiatives to unify Delta and Iceberg formats. We are looking for an exceptionally skilled and experienced Senior Staff Software Engineer to join our backend team. In this role, you will play a crucial part in designing, developing, and maintaining robust backend systems that support Databricks workspaces. You will be tasked with building the next-generation platform for serving workspace assets, ensuring high queries per second, low latency, and reliable, high-performance systems while proactively addressing future growth challenges. Additionally, as a senior member of the team, you will provide technical leadership, mentorship, and guidance to junior engineers, contributing to the overall enhancement of team coding practices and system designs.

At JetBrains, we strive to provide innovative tools designed to enhance the software development experience, making it both enjoyable and productive. With Amper, our next-generation build tool for the JVM and Kotlin ecosystem, we aim to simplify the build process, allowing developers to focus more on creation and less on configuration. The first experimental version of Amper was released in late 2023, and since then, we have been consistently improving it based on user feedback, showcasing its capabilities at KotlinConf 2024. We are seeking a passionate Amper Project Lead to take complete engineering ownership of Amper. In this role, you will connect various components—from the IDE to the build configuration language—shaping the future of JVM application development. This position involves tackling algorithmic challenges, architectural design, and integration with different operating systems and toolchains. Whether you are an expert in specific areas or possess a broad technical knowledge, your skills will be invaluable here! You will collaborate closely with teams in Engineering, Developer Advocacy, and Marketing to define the product’s value proposition, outline features, implement solutions, attract initial users, and drive scalability.

At Databricks, we are dedicated to empowering data teams to tackle some of the most pressing challenges in the world — from pioneering the next generation of transportation solutions to fast-tracking medical advancements. Our mission is fulfilled through the development and operation of a world-class data and AI infrastructure platform, enabling our customers to leverage deep data insights to transform their businesses.Founded by engineers and driven by a strong customer focus, we enthusiastically embrace every opportunity to confront technical challenges, whether it’s innovating next-generation UI/UX for data interfacing or scaling our infrastructure across millions of virtual machines. Our journey has just begun.Our engineering teams are tasked with creating highly technical products that address significant real-world needs. We manage and operate one of the most extensive software platforms, consisting of millions of virtual machines, generating terabytes of logs and processing exabytes of data daily. At our scale, we frequently encounter cloud hardware, network, and operating system faults, and our software must adeptly shield our customers from these issues.Unity Catalog serves as our platform's native unified and open governance solution for data and AI, breaking down silos, simplifying governance, and accelerating insights at scale. We are seeking a Senior Staff Software Engineer to lead the technical efforts for Unity Catalog Runtime Enforcement. This role involves building and fortifying the runtime enforcement layer for Unity Catalog, ensuring secure, consistent authorization, and data access across Databricks compute, engines, and cloud environments. This initiative aims to minimize incidents and streamline customer decisions by harmonizing enforcement semantics.

Since its inception in 2018, Bitvavo has been at the forefront of revolutionizing digital asset trading, seamlessly connecting traditional currencies with innovative digital assets. Our platform boasts transparent fees, an extensive asset range, and a user-friendly interface, making the future of currency accessible to everyone.In just two years, Bitvavo has emerged as the market leader in the Netherlands and ranks among the largest in Europe, with a thriving community of over one million users exchanging tens of billions in digital assets annually.We are actively seeking driven and talented individuals to join our Amsterdam team in making digital assets universally available.About the RoleWe are in search of a Senior Staff Engineer, Frontend to redefine how Bitvavo enhances customer experiences across all frontend products.Given that most user interactions occur through our app, this role emphasizes mobile development, with a significant impact across all user-facing interfaces. You will be pivotal in defining our approach to product development, ensuring our engineering teams can deliver swiftly, confidently, and with outstanding quality.This position holds considerable influence across departments, allowing you to shape engineering practices at Bitvavo, establishing principles and systems that guarantee our products remain reliable, fast, and enjoyable for users.Your ResponsibilitiesDefine the technical strategy for all of Bitvavo’s frontend systems.Influence product development processes to deliver fast and seamless user experiences.Collaborate with product and design teams to create intuitive and consistent user interfaces.Lead initiatives focused on enhancing performance, accessibility, and developer productivity.Ensure our products efficiently manage low-latency data interactions at scale.Mentor fellow engineers and foster technical leadership across the organization.Contribute to the operational framework of engineering as Bitvavo continues to scale.QualificationsOver 10 years of experience in developing large-scale, user-facing applications, with a strong emphasis on mobile technologies.Expertise in React Native, React, along with familiarity in iOS and Android native development.Demonstrated success in leading projects that significantly enhance technical quality and user experience.Experience with low-latency or real-time data systems.

Join us at Carv as we revolutionize the recruitment landscape with cutting-edge AI technology. As an AI Native Staff Engineer, you will leverage your experience in building autonomous systems to develop and deploy LLM-powered features that work seamlessly at scale.Your role will go beyond mere CRUD operations; you will architect innovative AI-driven solutions that transform product challenges into scalable success. Your expertise will help shape our AI engineering culture and influence the future direction of our technology.Key ResponsibilitiesDevelop Advanced AI Product SystemsDesign and launch AI-enhanced product features from concept to delivery.Architect systems that integrate LLMs, AI agents, and traditional software components effectively.Implement RAG pipelines, structured reasoning flows, and agent-based tools.Continuously enhance system reliability, response times, and cost-effectiveness.Maximize AI Engineering EfficiencyUtilize AI agents to expedite development processes, testing, and architectural decisions.Rapidly prototype and deliver production-quality systems.Establish internal AI tools that amplify team productivity.Pioneer new possibilities with state-of-the-art AI models.Deliver Impactful SolutionsConvert product challenges into efficient AI-enabled solutions.Assess real-world effectiveness through metrics like accuracy, business outcome, and user experience.Focus on production reliability over mere demo quality.Cultivate an AI-Driven Engineering CultureSet high standards for AI usage within the team.Develop practical evaluation and iterative processes.Mentor fellow engineers on AI-focused workflows.Contribute to the long-term technical vision.

Join our dynamic team at Adyen as a Staff Engineer specializing in Payments Settlement and Reconciliation. In this role, you will be responsible for ensuring accurate and timely settlement of payment transactions while enhancing our reconciliation processes. You will work closely with cross-functional teams to develop robust solutions and improve the overall customer experience.We are looking for innovative thinkers who are passionate about technology and have a deep understanding of payment systems. If you thrive in a collaborative environment and are eager to take on challenges, we want to hear from you!

Senior Software Development Engineer in Test (SDET) — Enablement PlatformAbout SwapAt Swap, we are revolutionizing agentic commerce through our cutting-edge AI-native platform that seamlessly integrates backend operations with an innovative storefront experience. We empower brands to sell anything, anywhere by centralizing global operations and providing intelligent workflows. Our solutions encompass cross-border transactions, tax management, returns, demand planning, and our next-generation storefront capabilities, enabling merchants to operate with transparency and confidence.We are committed to fostering a collaborative culture that prioritizes clarity, creativity, and shared ownership as we redefine the landscape of global commerce.About the RoleWe are on the lookout for a Senior SDET to become a vital part of our Enablement Group, which lays the groundwork that supports all teams. This includes developing internal developer tools, core services, reusable UI components, CI/CD processes, operational enablement, access/security integrations, public APIs, and platform adapters, along with Apollo, our ingestion and event/webhook intake and distribution layer.In this role, you will set the quality standards for internal systems and champion their adherence across teams. You will define both functional and non-functional quality requirements, translate these into measurable standards, and ensure that internal services comply through reviews, validations, and operational signals.ResponsibilitiesLead the establishment of quality standards for internal systems, focusing on aspects such as reliability, performance, scalability, security, availability, observability, data accuracy, and operability.Collaborate with engineering teams to translate standards into service-level requirements and clear acceptance criteria for platform capabilities and internal services.Manage the compliance process: determine how compliance is assessed, provide evidence (tests, checks, dashboards), and drive corrective actions when discrepancies are identified.Conduct structured quality reviews for internal services, including design reviews, readiness assessments, release criteria evaluations, and post-incident follow-ups that refine standards and checks.Define and uphold quality gates in CI/CD processes that enforce standards while maintaining team efficiency (contract checks, smoke/regression, and security checks where applicable).Establish API quality benchmarks for public APIs and platform adapters, including contracts, backward compatibility, and versioning.

Role overview airapps seeks a Software Architect based in Amsterdam to help shape and build software products. The focus is on designing and implementing solutions that deliver both strong performance and scalability. Collaboration with teams from different disciplines is an essential part of the work. What you will do Design and implement software architecture for both new and existing products Work closely with engineers, product managers, and other stakeholders to enhance product functionality Create solutions that support high performance and can scale as the business expands Who thrives in this role This position fits those who enjoy tackling complex problems and collaborating with others to achieve strong results. People who like to share ideas and adapt quickly will feel comfortable here.