Senior Software Engineer - APIs and Support Systems

Your RoleYou will become a key member of our EXP Squad, responsible for developing customer-facing APIs and backend systems that enable enterprise clients to manage and automate their IoT connectivity. These production systems play a crucial role in enhancing adoption, scalability, and reliability.As a Senior Software Engineer, you will work at the crossroads of innovative product design and technical excellence. Your role extends beyond merely executing tasks; you will take complete ownership of features, driving them from initial discovery and architectural design through to deployment and ongoing iterations. You will be instrumental in creating scalable, secure, and extensible systems.Our core technology stack comprises TypeScript, Node.js, and NestJS, all hosted on AWS with Infrastructure as Code.Location: Berlin, Würzburg, or remote within Germany and Poland.

At Veo, we are at the forefront of AI-driven sports camera technology. Our cutting-edge, fully automated camera solution empowers sports teams to capture matches and training sessions effortlessly, eliminating the need for a camera operator. We are committed to democratizing sports by providing video analysis tools to teams of all levels, a service that was once exclusive to a select few. Currently, more than 40,000 clubs across 90+ countries utilize our technology to record their games on a weekly basis.What truly distinguishes us is our exceptional team. We are a diverse collection of innovative thinkers, creators, and problem-solvers who are passionate about delivering outstanding products while enjoying the journey.Your RoleAs a Senior Software Engineer specializing in API development at Veo, you will become a pivotal member of a newly formed team dedicated to enhancing our API capabilities. Your contributions will be instrumental in establishing the technical groundwork that enables reliable and scalable integration of external partners with Veo's platform.You will report to an Engineering Manager and work out of our Berlin office, collaborating closely with fellow engineers and a Technical Product Manager. Together, you will architect and build backend systems and APIs that are central to Veo's platform, making strategic architectural decisions that are crucial to our growth and connectivity within the broader sports ecosystem.

Are you a passionate software engineer with expertise in Rust and AWS APIs? Join our innovative team at Statista, where you will play a crucial role in developing and optimizing our cloud-based applications. We are looking for a Senior Software Engineer who thrives in a collaborative environment and is eager to tackle complex challenges.In this role, you will be responsible for designing, implementing, and maintaining scalable software solutions while ensuring high levels of performance and reliability. You will work closely with cross-functional teams to deliver impactful solutions that drive our business forward.

Join Synthflow AI, a revolutionary no-code platform designed for deploying voice AI agents that transform contact center operations and business process outsourcing (BPO) at scale. We empower mid-market and enterprise companies to efficiently manage routine calls, ultimately saving valuable time and resources for their teams.Our voice AI agents have made a significant impact:Saved over 5 million hours in contact center operationsIncreased call answering rates by 35% compared to non-AI operatorsHandled 45 million calls with an impressive 99.9% uptimeSupported by leading investors such as Accel, Atlantic Labs, and Singular, we are proud to serve over 1,000 customers and drive an industry shift towards advanced and accessible conversational AI.About the Role:We are seeking a Senior Python Engineer to develop robust, production-grade software and backend systems, focusing on databases, scalable APIs, and core engineering principles.Your Key Responsibilities:Design, develop, and maintain our backend infrastructure, ensuring scalability, performance, and reliability.Create and enhance data models and persistence layers with a strong emphasis on PostgreSQL best practices, including schema design, migrations, query optimization, indexing, and transactions.Develop and support enterprise-grade APIs using FastAPI, focusing on versioning, authentication/authorization, and observability.Participate in pair programming to foster code quality and team collaboration.Manage deployments and environments with Kubernetes and GitOps practices (ArgoCD).Conduct code reviews, offering constructive feedback and ensuring adherence to best practices.Contribute to end-to-end product delivery, including occasional front-end feature development when necessary.Qualifications:5+ years of experience as a Python developer, successfully delivering production systems.Proven expertise in building scalable and extensible data infrastructures.Strong familiarity with relational databases, particularly PostgreSQL (performance tuning, migrations, transactions).Experience in developing and maintaining enterprise-grade APIs using FastAPI.Solid understanding of engineering fundamentals and best practices.

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 praxipal seeks a VoIP/API System Integrator based in Berlin. This role centers on building and maintaining communication solutions tailored for clients. The position involves practical work with VoIP systems and integrating APIs to improve client communication and daily operations. What you will do Design, implement, and support VoIP systems and API integrations Work closely with colleagues from various disciplines to deliver dependable solutions Take part in projects that help clients streamline and improve their workflows

Role overview AMOSS is looking for a Backend Engineer to work on Content-API development. The position centers on backend systems that influence both user experience and overall system performance. Go is the main programming language, and the work includes close collaboration with teams using React. What you will do Develop and enhance backend APIs for content delivery Write clear, maintainable code in Go Work alongside frontend teams that use React Identify and solve complex backend issues Help improve system performance Location This role is based in Berlin.

Veeva Systems is an innovative leader in the industry cloud space, dedicated to accelerating the delivery of therapies to patients. As one of the fastest-growing SaaS companies in history, we achieved over $2 billion in revenue last fiscal year and are poised for significant continued growth.Our core values—Do the Right Thing, Customer Success, Employee Success, and Speed—define our unique culture. In 2021, we made history by becoming a public benefit corporation (PBC), which legally binds us to consider the interests of our customers, employees, society, and investors.As a Work Anywhere company, we offer the flexibility to work from home or in the office, allowing you to thrive in your preferred environment.Join us in transforming the life sciences industry by making a meaningful impact for our customers, employees, and communities.The RoleWe invite you to be a part of our talented Vault Platform team as a Senior Site Reliability Engineer, where your expertise will ensure the scalability and reliability of our enterprise applications. You will address complex global challenges, leveraging your deep knowledge of Java and modern open-source technologies to enhance our production systems.Ideal candidates will possess extensive experience with Java applications and contemporary open-source technologies, preferably gained from enterprise software development or high-growth tech environments. A natural curiosity and problem-solving ability are essential, along with a sophisticated engineering perspective to understand system integrations that support hundreds of customers across North America, Europe, and Asia.

Please note that this position is based in Berlin, Germany - relocation support is provided if required. THE BEST WORK OF YOUR CAREER Trade Republic is Europe’s largest savings platform, operating in 18 countries and trusted by over 10 million customers with more than €150 billion in assets. Our ambitious mission is to empower individuals to build wealth through easy, secure, and free access to financial systems. You will have the chance to elevate your career while working alongside exceptional talents and cutting-edge technology to create a positive impact for millions. Our Corporate IT team ensures that Trade Republic’s internal infrastructure operates securely and efficiently, enabling teams across Europe to deliver at scale. As a Senior IT Systems Engineer, you will merge technical expertise with operational leadership, designing, automating, and maintaining the systems that keep our company thriving.

About Gigs Gigs builds a platform that lets technology companies add global mobile connectivity to their products. The goal: make it as easy to offer mobile services as it is to set up payments. Gigs removes telecom complexity for customers ranging from fintech startups launching mobile plans to HR platforms managing work phones. The team includes about 100 people working across the US and Europe, backed by nearly $100 million from investors like Ribbit Capital, Google, and Y Combinator. Gigs brings together engineers, product specialists, and business leaders with backgrounds at Stripe, Airbnb, Shopify, and other top tech companies. The company is growing quickly and tackling both technical and regulatory challenges to make connectivity seamless. Core Values Speed: Work with urgency and treat each week as important for progress. Ownership: Take initiative when problems arise and act with autonomy. Customer Obsession: Focus on customer success as a measure of company success. Ambiguity: Use good judgment and instincts to make decisions, even with incomplete information. First Principles: Question established practices and seek to understand the reasons behind them. Role Overview: Senior IT Systems Engineer The Senior IT Systems Engineer will help ensure that everyone at Gigs has the access, tools, and support needed to work efficiently. This position focuses on building and automating corporate IT infrastructure. The role is hands-on and results-driven, joining as the third member of the Security & IT team. Locations London, Amsterdam, Berlin

About UsAt Helsing, we are on the forefront of defense technology, specializing in artificial intelligence to safeguard democracies. Our goal is to ensure that open societies retain the ability to make independent decisions and uphold their ethical standards.As champions of democracy, we recognize our unique obligation to responsibly develop and implement advanced technologies like AI. This responsibility is at the heart of our mission.We are a dedicated and dynamic team of engineers, AI experts, and customer-oriented program managers, seeking individuals driven by a sense of purpose to join our European teams. Here, you will apply your expertise to tackle the most intricate and impactful challenges. We cultivate a culture of openness and transparency, encouraging healthy discussions about the role of technology in defense, its advantages, and ethical considerations.Your RoleAs a Software Engineer, you will design the autonomy system for a pioneering autonomous aerial platform that will take to the skies. You will not only develop software but also integrate cutting-edge reinforcement learning agents into the operational systems of our Unmanned Combat Aerial Vehicle (UCAV), the CA-1 Europa, as part of the innovative Centaur project. This is a rare opportunity to significantly contribute to a groundbreaking autonomous system built from the ground up.Operating at the intersection of machine learning and systems engineering, you will embed reinforcement learning agents into high-performance runtime systems, facilitating real-time autonomous decision-making during flight. Your code will empower the CA-1 Europa to perceive, reason, and act autonomously in the most challenging environments.The solutions we create ultimately serve real people in high-risk, high-stress situations, requiring our work to be exceptionally reliable.

Role Overview JetBrains s.r.o. creates tools that help developers work smarter. The team is looking for a Software Engineer with experience in CLion, embedded debugging, and tool integrations. This position is open in several locations: Belgrade, Berlin, Limassol, Madrid, Munich, Paphos, and Warsaw. What You Will Do Design and enhance features in CLion focused on embedded systems. Debug and optimize embedded applications for reliability and performance. Integrate different development tools to improve workflow efficiency. Work with teams across disciplines to define needs and deliver solutions. Who We’re Looking For This role suits engineers who enjoy solving complex problems and improving developer tools. Curiosity, creativity, and a strong interest in technology are valued here.

Who We AreAt Helsing, we are at the forefront of defense AI innovation, dedicated to safeguarding our democracies. Our vision is to achieve technological supremacy, enabling open societies to maintain their sovereignty and uphold ethical standards in technology.We recognize our unique responsibility as a democratic entity to thoughtfully develop and deploy advanced technologies such as AI. Our team is passionate about this mission.We are a dynamic group of engineers, AI experts, and program managers, eager to welcome mission-driven individuals to our European teams, where your skills will be instrumental in tackling some of the most complex and significant challenges. Our culture promotes open dialogue and encourages thoughtful discussions regarding the ethical implications and benefits of technology in defense.The RoleEnvision constructing the essential infrastructure for a pioneering autonomous aerial platform that will take flight. At Helsing, your contributions will extend beyond mere software development; you will be instrumental in defining the core functionalities of our Unmanned Combat Aerial Vehicle (UCAV), the CA-1 Europa. This is an exceptional opportunity to impact a groundbreaking system designed from inception.You will engineer the advanced mission control framework, sophisticated infrastructure that facilitates real-time sensor processing, secure communications, seamless integration of autonomous decision-making modules, and dependable interfacing with lower-level flight control systems. Your code will be vital to the CA-1 Europa's performance, enabling it to navigate, perceive, and operate effectively in demanding environments.We develop software that operates under significant and unconventional technical constraints, functioning in diverse and ever-changing environments, while addressing a growing array of challenging use cases. The software we create is deployed in high-risk, high-stress situations, underscoring the necessity for reliability and seamless functionality. This presents a range of fascinating engineering challenges across multiple disciplines that you will help us tackle.

Berlin, On-site · Full-time €70,000-€90,000 + equity⏰ Full-timeOverviewAt Kombo (YC S22), we are revolutionizing the way engineering teams integrate their HRIS, ATS, and Payroll systems by developing a unified API that saves hundreds of hours of work. We are currently seeking a dedicated Technical Support Engineer to deliver outstanding technical support to our expanding client base, troubleshoot complex integration challenges, and contribute to building the backbone of our customer support system. In this role, you will act as the crucial technical liaison between our clients and our product and engineering teams.About KomboKombo is pioneering a unified API solution for HR, payroll, and recruitment systems. By enabling companies to integrate once with our platform, they gain immediate access to over 160 different systems, effectively simplifying the complexities of various data schemas, authentication methods, and API peculiarities.Since our time in Y Combinator in 2022, we have:Secured over $30M in funding from Y Combinator, Acadian Ventures, 468, and other investors.Achieved over $10M in annual recurring revenue (ARR) with a rapidly growing customer base.Scaled to process data for 10% of Germany's workforce.Expanded our team to over 50 members across two offices.As a global company with headquarters in New York City and Berlin, we proudly represent over 20 nationalities within our team.Why Support at Kombo is EssentialWe place a premium on exceptional support for our customers, as we believe it is a key competitive advantage. Our commitment to outstanding customer service has led us to win G2 badges for best support in our category and regularly receive accolades from customers who regard our support as the best they have experienced across all products.

At Upvest, our vision is to revolutionize the investment landscape, making it as effortless as everyday transactions. We provide businesses with the tools to offer a diverse array of investment products and an unparalleled user experience in capital market investments and retirement planning. Our Investment API is designed for seamless integration, enabling fintechs and financial institutions to optimize their resources and concentrate on their core business activities.We take pride in collaborating with Europe’s top fintechs and financial institutions, including DKB, Revolut, N26, and Raisin. Established in 2017 by Martin Kassing, Upvest boasts a vibrant team of over 270 professionals from more than 70 nationalities. Our growth is fueled by leading investors such as Hedosophia, Sapphire, Bessemer Venture Partners, BlackRock, Earlybird, HV Capital, Notion Capital, and Motive Ventures.What You Will Be Doing:Contributing to a dynamic product team with extensive ownership and responsibilities.Utilizing state-of-the-art technologies, with a primary focus on Go, while enjoying a clean codebase. We welcome candidates with Go experience or those from a fintech background eager to transition to Go.Enhancing the reliability of our API systems.Delivering rapidly and consistently by leveraging an agile work methodology, including retrospectives and demos at the end of each two-week cycle.Designing, building, and owning event-driven, fault-tolerant, horizontally scalable distributed systems using a microservices architecture powered by Docker, Kubernetes, Kafka, and PostgreSQL.Preferred Qualifications:Experience with investment products or within the fintech sector.Familiarity with event-driven architectures, event streaming, and event sourcing systems.Experience in operating services within a decoupled, event-driven system, utilizing modern observability tools (e.g., monitoring and tracing).Success Factors for This Role:A genuine enthusiasm for fintech and building the financial infrastructure of the future.A collaborative spirit, with a focus on team success.

Join Our Team at GetYourGuide At GetYourGuide, we are the world’s leading platform for unforgettable travel experiences. Since our inception in 2009, we have empowered travelers across the globe to discover and book over 150 million tours, activities, and attraction tickets. Our headquarters in Berlin is home to a dynamic team of over 800 travel experts and technologists, united by a passion for making travel magical. Explore our careers page to learn more about our culture and values. Our Mission: Technology is the driving force behind our growth at GetYourGuide. We continue to innovate in Design, Engineering, and Product to redefine the travel experience. You will play a crucial role in developing solutions that simplify customer interactions and enable our partners to thrive. From creating fintech infrastructure to enhance payment processes to contributing to our strategic growth, the impact of your work will resonate globally. As part of our Engineering team, you will collaborate with diverse, cross-functional teams to enhance the magic of travel for our users. Your Role: As a Senior Software Engineer with a focus on Frontend, you’ll be an integral part of a product team. Collaboration and a customer-centric approach are key as you tackle real-world user challenges and shape the product experience. This is primarily an 80/20 full-stack role, utilizing TypeScript and Node.js for backend development. A robust knowledge of both frontend and backend technologies is necessary, particularly in managing our Server-Driven UI backend-for-frontend (BFF) layer, which involves creating backend components that adapt to frontend requirements to elevate the user experience. Your role will require close cooperation with product managers, designers, and stakeholders, so strong collaboration and communication skills are essential. We seek engineers who not only excel technically but also effectively advocate for customer needs and align with business objectives. You’ll support the team in building and scaling our platform, ensuring a seamless and engaging user experience.

About UsHelsing is a cutting-edge defense AI company dedicated to safeguarding democracies. Our mission is to achieve technological leadership to enable open societies to maintain sovereign control over their ethical standards.We recognize our unique responsibility to thoughtfully develop and deploy powerful technologies such as AI, and we take this duty seriously.Our team comprises ambitious engineers, AI experts, and customer-focused program managers, all driven by a mission to tackle some of the most complex and impactful challenges. We foster an open and transparent culture encouraging healthy discussions about the ethical implications and benefits of technology in defense.The RoleJoin our Autonomous Air System Verification & Validation (V&V) team, where we create simulation and validation environments essential for rigorous testing of autonomous aerial systems prior to deployment. We develop Software-in-the-Loop (SiL) and Hardware-in-the-Loop (HiL) frameworks that allow engineers to integrate, test, and validate AI-driven functionalities against realistic hardware setups.Our projects involve navigating significant and unconventional technical constraints, adapting to a diverse range of dynamic environments, and addressing an expanding array of intricate use cases. The software we develop is used by individuals in high-risk and high-stress scenarios—covering mission planning, command and control (C2), and mission debriefing—requiring utmost reliability and seamless performance.By joining us, you will face exciting backend engineering challenges across various domains, contributing to solutions that have real-world implications.

About UsHelsing is at the forefront of defence technology, specializing in artificial intelligence. Our mission is to safeguard democratic values and ensure that societies maintain sovereignty over their ethical standards through advanced technology.As a team of dedicated engineers, AI experts, and program managers, we are committed to tackling complex challenges in our field. We actively seek individuals whose passion aligns with our mission to contribute to meaningful technological advancements. Our culture promotes open discussions about the implications and ethics of technology in defence, ensuring a thoughtful approach to innovation.The PositionJoin our Autonomous Air System Validation and Verification (V&V) team, where we create sophisticated simulation and validation environments essential for rigorously testing autonomous air systems. Our work involves developing Software-in-the-Loop (SiL) and Hardware-in-the-Loop (HiL) frameworks that facilitate the integration, testing, and assurance of AI capabilities against simulated and real-world hardware.The software we develop is designed to meet high standards despite unconventional technical constraints. It must adapt to various dynamic environments and cater to a growing array of demanding use cases. Our solutions are critical for real-world applications, from mission planning to command and control, necessitating high reliability and seamless operation.The role encompasses a wide spectrum of fascinating engineering challenges across multiple disciplines, and we value innovative solutions that drive our mission forward.

Join our dynamic team as a Senior Software Engineer specializing in JavaCard development. In this role, you will leverage your expertise to design, implement, and enhance innovative software solutions that drive our business forward. Collaborate with cross-functional teams to deliver high-quality software that meets the needs of our clients. If you are passionate about technology and eager to make an impact, we want to hear from you!

Join our innovative team at dev2 as a Senior Backend Software Engineer, where you'll be instrumental in crafting robust and scalable software solutions. In this role, you will collaborate closely with cross-functional teams to design, develop, and deploy high-performance backend systems.