Senior Backend Engineer – API Trading EMEA (F/M/D)

At Flowdesk, we are on a mission to establish a global financial institution for digital assets, meticulously crafted to foster market integrity and enhance efficiency.In a swiftly evolving market landscape, we employ a disciplined, first-principles methodology in all our operations. This approach is woven into our core services, including institutional liqu…

xai seeks a Backend Engineer in London, UK to focus on API development. This role involves designing and building APIs that form the backbone of the company’s products and services. Key responsibilities Design and implement APIs to support xai’s solutions Collaborate with frontend developers and product managers to ensure seamless feature integration Optimize API performance and maintain reliability This position offers the chance to work closely with both technical and product teams, shaping the way xai’s services communicate and perform.

Join Talos Trading as a Sales Associate focused on the EMEA region, where you will play a pivotal role in driving sales and fostering strong relationships with clients. Your passion for sales and understanding of market dynamics will be key in promoting our innovative trading solutions. This is an exciting opportunity to be part of a fast-growing company at the forefront of trading technology.

Empowering the Digital Asset EcosystemEstablished in 2018, Talos delivers state-of-the-art trading technology tailored for institutions in the global digital asset marketplace, serving many key players within the cryptocurrency landscape.Our objective at Talos is straightforward: to facilitate the widespread acceptance of digital assets by effectively linking institutions to the digital asset ecosystem. We are dedicated to developing the most innovative and reliable platform globally, catering to the complete trading lifecycle.At Talos, we cultivate an environment that promotes kindness and respect, values diverse viewpoints, and ensures inclusivity at every level. We believe that every team member contributes unique insights and skills that propel Talos forward. In our quest for excellence, we nurture a culture built on trust, integrity, collaboration, and collective growth. Together, we are ambitiously creating something remarkable. Your individual talents and perspectives will be vital to our shared accomplishments.We are a close-knit yet decentralized group of experienced engineers and business professionals, with a hybrid-friendly work culture, maintaining physical locations in New York, London, Singapore, and Cyprus.Role OverviewJoin us as our Senior Counsel, EMEA, based in London, and play a pivotal role in accelerating Talos’ expansion in EMEA and beyond. You will be an integral part of Talos’ global legal team, collaborating closely with our New York-based General Counsel on innovative legal challenges related to a new class of assets. In this position, you will function as a legal generalist, addressing a spectrum of tasks from negotiating commercial agreements to formulating legal strategies for new products within this emerging sector. You will serve as a trusted advisor to business stakeholders, offering clear, risk-informed guidance on intricate issues across various jurisdictions.This Senior Counsel position is tailored for a UK-qualified lawyer who thrives in a hands-on role, enjoys taking ownership, and is keen on developing scalable processes within a rapidly growing global digital asset firm.

Join Contentful as a Senior Backend & Infrastructure Software Engineer and play a pivotal role in shaping the future of our platform. In this role, you will design and implement robust backend solutions that enhance our infrastructure capabilities, ensuring scalability and performance. Collaborate with cross-functional teams to tackle complex technical challenges and drive innovation within the organization.

Join Us as a Software EngineerAt Talos, we are leading the way in institutional trading technology for the digital asset market, established in 2018. Our cutting-edge solutions empower major players in the crypto ecosystem, facilitating seamless trading and settlement processes.Our mission is to promote the widespread adoption of digital assets, creating a trusted and innovative platform that supports the entire trading lifecycle. We pride ourselves on fostering a workplace that values kindness, respect, and inclusivity, where diverse perspectives fuel our progress.As part of a close-knit yet decentralized team of skilled engineers and professionals, you will thrive in our hybrid-friendly environment, with hubs in New York, London, Singapore, Sweden, and Cyprus.As a Software Engineer at Talos, you will be instrumental in developing high-performance systems that bridge the gap between crypto and capital markets. Collaborating with our talented team, you will enhance our backend trading and settlement platform, focusing on areas such as order routing, market data connectivity, position management, and risk systems.We seek passionate engineers eager to take ownership of their work and contribute across the entire development lifecycle—design, implementation, testing, and deployment. If you enjoy tackling complex challenges in a fast-paced environment and are eager to learn from seasoned colleagues, we want to hear from you! Experience in finance or crypto is a plus, but your coding skills, critical thinking, and collaborative spirit are our top priorities.Interested in our engineering culture? Explore Sonic, our inaugural open-source project that enables microsecond network stack latency in Go: https://github.com/talostrading/sonic

Join Our Innovative Team in the Digital Asset MarketFounded in 2018, Talos is at the forefront of providing institutional-grade trading technology tailored for the global digital asset market, empowering many key players within the crypto ecosystem.At Talos, our mission is to foster the widespread adoption of digital assets by effectively connecting institutions to the evolving digital asset landscape. We are dedicated to developing the most innovative and trusted platform, supporting a comprehensive trading lifecycle.Our workplace embodies kindness, respect, and inclusivity, valuing diverse perspectives that contribute to our growth. We believe that each team member brings unique insights and skills that propel Talos towards excellence. In our commitment to collaboration and mutual success, we cultivate a culture of trust and integrity, working together to build something remarkable. Your contributions will be vital to our collective achievements.We are a close-knit yet decentralized team of experienced engineers and business professionals, operating in a hybrid-friendly environment with offices in New York, London, Singapore, Sweden, and Cyprus.About the RoleAs a Software Engineer in our Trading Connectivity team, you will be responsible for designing, developing, and maintaining high-performance backend systems that interface with our extensive provider network. Your role will involve collaborating with product managers, trading support, other engineering teams, and clients to facilitate the integration of new liquidity providers into the Talos network. You will be instrumental in enhancing the platform's scalability, reliability, security, and overall performance, managing the integration process from requirement gathering to deployment.To learn more about Talos's engineering culture, explore Sonic, our inaugural open-source project that enables us to achieve microsecond network stack latency in Go: https://github.com/talostrading/sonic

About KeyrockSince our inception in 2017, Keyrock has emerged as a pioneering force in the digital asset sector, celebrated for our innovative partnerships and cutting-edge solutions.With a global team of over 220 members representing 42 nationalities, we embrace diversity and foster a culture of collaboration. Operating primarily in a remote environment, we maintain hubs in London, Brussels, and Singapore, ensuring regular interaction through online and offline meetups.We engage in trading across more than 80 exchanges and collaborate with a variety of asset issuers. As a recognized market maker, our extensive expertise has fueled our rapid expansion into services including market making, options trading, high-frequency trading, OTC, and DeFi trading desks.At Keyrock, we are not merely service providers; we are innovators. We are at the forefront of adopting the Rust Development language for algorithmic trading, and we champion its application throughout the industry. Our Accelerator Program bolsters the growth of Web3 startups, while we enhance ecosystems by providing liquidity to promising DeFi, RWA, and NFT protocols. Our commitment to advancing the industry is evident through our research and governance initiatives.We are seeking a proactive and detail-oriented Trading Operations Specialist to join our EMEA trading operations team. This role involves close collaboration with our trading, treasury, and broader operations teams during EMEA trading hours.

Join LaunchDarkly as a Senior Solutions Engineer for the EMEA region, where you will play a critical role in helping our customers understand and implement our feature management platform. Your expertise will enable organizations to innovate faster while maintaining control over their software releases. As a technical leader, you will work closely with our sales and product teams, demonstrating the value of our solutions and contributing to the success of our clients.

Join Our Team!At Plum, we are revolutionizing how people save and invest. Our mission is to empower individuals to grow their wealth for life, whether they are saving for their first home or enjoying retirement. Since our inception in 2016, over 2 million users across 10 European countries have saved more than £2 billion with our innovative automation and AI technology. We've been recognized with awards from esteemed organizations like Deloitte and Finder, reflecting our commitment to excellence.We are a passionate team of over 200 Plumsters working collaboratively across Europe, and we are eager to welcome more talented individuals to help us achieve our vision.Your RoleAs a Senior Backend Engineer at Plum, you will play a crucial role in shaping our technology and product offerings. We seek engineers who are not only technically adept but also understand the importance of delivering outstanding products to our customers.

Join Contentful as a Senior Backend Engineer specializing in our cutting-edge AI Platform. In this pivotal role, you will architect and develop robust backend systems that support our innovative AI solutions. Collaborate with a dynamic team of engineers and data scientists to design scalable APIs and enhance our platform's capabilities.

About the RoleWe are seeking a talented Senior Backend Engineer to join our Research & Development team at ThreatAware. In this pivotal role, you will collaborate directly with our CTO to develop the next generation of our platform. You will empower security teams to create AI-driven workflows, automate critical decisions, and interact with their data in innovative ways. This position involves profound backend development tasks, including designing abstractions, prototyping agent-based patterns, and transforming visionary ideas into real-world systems. If you're passionate about pushing boundaries in AI and cybersecurity, this is the perfect opportunity for you.Why Choose ThreatAware?At ThreatAware, we provide security teams with a comprehensive source of truth for every device and tool within their organization. With over 150 integrations, our platform can be deployed in under 30 minutes, delivering real-time visibility across complete IT estates. Industries such as finance, legal, energy, and healthcare rely on us to identify what is secured and what isn't.We are now embarking on a larger initiative. Building on six years of precise cyber asset data, we are integrating AI capabilities to offer security teams new avenues for data interrogation, workflow automation, and proactive risk management. You will play a central role in bringing this vision to life.Your ResponsibilitiesAs a Senior Backend Engineer, you will:Design and develop the AI composition layer that drives the next chapter of ThreatAware.Architect backend systems that facilitate the dynamic integration of data sources, AI reasoning, and automated security actions.Create APIs, data models, and execution engines for complex, multi-step workflows, ensuring they are scalable, resilient, and observable.Prototype and validate agentic patterns, including multi-agent collaboration and hierarchical reasoning, utilizing LLMs.Ensure AI outputs are grounded in accurate cyber asset data by developing retrieval systems, validation checks, and confidence indicators.Incorporate security as a fundamental aspect of your work, focusing on authentication, authorization, audit logging, and data protection.What We Are Looking ForExtensive backend engineering experience in building large-scale, production systems with a strong emphasis on system design and architectural thinking.Proficient in Python, TypeScript, or similar languages, with a solid track record in designing APIs, databases, and event-driven systems.Hands-on experience with cloud infrastructure, preferably AWS, including serverless architectures, messaging, and containerized services.A strong interest in AI and LLMs, ideally with experience in integrating AI with backend systems or developing AI-native applications.

About WintermuteWintermute is a pioneering technology company and a leading player in the algorithmic trading sector, focusing on digital assets. We are dedicated to providing liquidity across a vast array of cryptocurrency exchanges and trading platforms. Additionally, we offer comprehensive OTC trading solutions, supporting both high-profile blockchain initiatives and traditional financial institutions transitioning into the crypto space. Our Wintermute Ventures division also invests in promising early-stage DeFi projects.Founded in 2017, Wintermute has adeptly navigated the complexities of industry cycles. Our culture merges the high-frequency trading standards of traditional markets with the innovative and entrepreneurial spirit typical of technology startups. We are firm believers in the transformative potential of blockchain, and we take a long-term approach to the digital asset market, positioning ourselves as leaders in fostering a compliant and innovative trading environment. For more details, you can read more here.Why Join Wintermute?We are on the lookout for an Algorithmic Trader with robust coding abilities (Python) and a keen interest in high-frequency trading, liquidity provision, and cryptocurrency markets. From day one, you will manage your own “desk” and have the chance to create and refine your own trading algorithms and strategies. You will receive invaluable mentorship from seasoned traders and developers, including our founders and management team. Expect a high degree of autonomy and responsibility from the outset, allowing you to make a significant impact without the hindrance of legacy systems or bureaucratic red tape.Your ResponsibilitiesFollowing a brief training period, you will focus on enhancing existing trading strategies, introducing new trading products, and advancing the technology behind our trading systems. You will analyze extensive trading and transaction data to extract insights, prioritize them, and devise solutions based on your findings. You will have the opportunity to influence P&L positively and will be encouraged to experiment with innovative ideas and strategies. We will provide more technical specifics during the interview process.Please note: We seek individuals with strong quantitative and coding skills; however, this is primarily a business/trading role rather than a research position.

Join Our Team at WintermuteAs a leading technology unicorn and one of the foremost algorithmic trading firms in the digital assets space, Wintermute is at the forefront of cryptocurrency liquidity provision across major trading platforms. We specialize in offering a wide array of OTC trading solutions and are committed to advancing high-profile blockchain initiatives alongside traditional financial institutions transitioning into the crypto ecosystem. Additionally, our Wintermute Ventures division invests in pioneering DeFi projects.Since our inception in 2017, Wintermute has adeptly navigated the ever-changing landscape of the cryptocurrency market. We pride ourselves on blending the rigorous technology standards of high-frequency trading firms with the dynamic and innovative culture characteristic of technology startups. Our vision is rooted in the transformative potential of blockchain, and we are dedicated to shaping a compliant and progressive market for digital assets. Discover more about us here.Position OverviewWe are looking for a skilled C++ Developer to join our expanding options trading team—one of the largest electronic trading desks within the crypto options market. In this pivotal role, you will work closely with our traders to develop high-performance, scalable options trading systems. Your engagement will span the full options stack, promoting business growth across centralized finance, decentralized finance, and OTC. The ideal candidate will demonstrate strong problem-solving abilities and thrive in a fast-paced environment.

About WintermuteWintermute is a pioneering technology firm and one of the largest algorithmic trading companies specializing in digital assets. We excel at providing liquidity across a multitude of cryptocurrency exchanges and trading platforms, offering a wide array of OTC trading solutions, while also bolstering high-profile blockchain initiatives and traditional financial institutions venturing into the crypto space. Additionally, Wintermute operates a ventures arm that invests in promising early-stage DeFi projects.Since our inception in 2017, Wintermute has adeptly navigated through various industry cycles. Culturally, we blend the technological excellence of high-frequency trading firms in traditional markets with the innovative spirit of technology startups. At Wintermute, we are committed to harnessing the transformative potential of blockchain technology. Our long-term vision focuses on the digital asset market, and we strive to play a leading role in establishing an innovative and compliant trading environment. You can learn more about us here.Join Our Team at WintermuteWe are on the lookout for a passionate C++ Trading Platform Developer who possesses a keen interest in both the intricate details of computer hardware and the overarching design of large-scale systems, including data infrastructure. Ideal candidates will have a natural curiosity to explore the inner workings of systems, a solid understanding of data structures, and experience in writing client-server network applications. Additionally, proficiency in writing and optimizing high-performance code is essential. We value both your commercial experience and personal projects that showcase your dedication to technology. A genuine interest in algorithmic and quantitative trading will be considered advantageous.At Wintermute, you will have the opportunity to grow your skills and make a direct impact on our trading activities by developing and enhancing various components of our trading platform, data infrastructure, and related software. You will receive mentorship and insights from seasoned developers and traders, including the founders of the company. Expect a high degree of independence and responsibility from the outset, with a learning curve that is second to none. We do not have legacy systems, excessive approvals, or bureaucracy; all developers report directly to the CTO, who is actively involved in day-to-day operations. Your contributions will be evaluated based on their impact rather than the hours you log.

At Spotify, we are on a mission to revolutionize the way creators and listeners engage with long-form storytelling through our Audiobooks initiative. Our objective is to create a seamless ecosystem for audiobook content, facilitating smooth transfers from publishers to listeners. This includes building the robust systems necessary for content ingestion, processing, and efficient delivery across our rapidly expanding global catalog. We are seeking a talented Senior Backend Engineer to join a dynamic and impactful team within the Audiobooks Pipeline sector. This team's primary responsibility is to design and scale systems that handle the ingestion, processing, and transformation of audiobook and eBook content, metadata, and royalties, ensuring that listeners receive the right content with utmost efficiency and quality. While this role encompasses full-stack responsibilities, the emphasis will be on backend and data-centric development. We are looking for an individual who thrives in uncertain environments, is passionate about learning, and is excited to tackle complex challenges across the tech stack.

About WintermuteWintermute is a pioneering technology firm and one of the foremost algorithmic trading companies specializing in digital assets. Our mission is to provide liquidity across a diverse range of cryptocurrency exchanges and trading platforms. We also offer comprehensive OTC trading solutions while supporting prominent blockchain initiatives and traditional financial institutions transitioning into the crypto space. Additionally, Wintermute Ventures invests in early-stage DeFi projects, further enhancing our influence in the industry.Founded in 2017, Wintermute has adeptly navigated through various industry cycles. We blend the high-frequency trading standards of traditional markets with the innovative spirit of technology startups. At Wintermute, we are committed to harnessing the disruptive potential of blockchain technology, maintaining a long-term perspective on the digital asset market, and leading the way in establishing a compliant and innovative trading environment. To learn more, please visit our website.Join Our TeamWe are on the lookout for a passionate C++ Quant Developer who thrives on technology and possesses a keen interest in both the intricate details of computer hardware and the overarching design of expansive systems, including data infrastructure. The ideal candidate enjoys exploring the inner workings of technology, has a solid understanding of data structures, and possesses experience in developing client-server network applications and optimizing high-performance code. We value prior experience from personal projects as well as professional backgrounds. A PhD in mathematics is common among our Quant Developers, and a solid grasp of mathematical concepts is essential. An interest in algorithmic and quantitative trading is a bonus.At Wintermute, you will have the unique opportunity to directly influence our trading activities by developing and enhancing various aspects of our trading platform, data infrastructure, and related software. You will receive guidance from seasoned developers and traders, including our founders. Expect immediate responsibility and independence, enabling you to learn at an unparalleled pace! We operate without legacy systems, bureaucratic hurdles, or multiple approval layers; all developers report directly to our hands-on CTO. The impact you make is truly up to you!

About WintermuteWintermute is a prominent technology unicorn and one of the leading algorithmic trading firms specializing in digital assets. We excel in providing liquidity across a wide range of cryptocurrency exchanges and trading platforms, offer diverse OTC trading solutions, and support significant blockchain projects and traditional financial institutions transitioning into the crypto space. Additionally, Wintermute Ventures actively invests in early-stage DeFi projects.Founded in 2017, Wintermute has adeptly navigated through various industry cycles. We blend the rigorous technological standards of high-frequency trading firms with the innovative spirit characteristic of tech startups. At Wintermute, we are committed to harnessing the innovative potential of blockchain technology and hold a long-term vision for the digital asset market, positioning ourselves as leaders in establishing a creative and compliant marketplace. Discover more about us here.Join Our DeFi TeamWe are seeking an enthusiastic and inquisitive student to join our DeFi team for a 6-month internship. In this role, you will research on-chain protocols and conduct data-driven experiments that contribute to our understanding of decentralized finance.Our trading philosophy is fundamentally technological—our traders are analytical and programmatic problem solvers who thrive on innovation. In true DeFi fashion, this position offers you the chance to take on various roles, working across multiple codebases and languages to explore the ecosystem's design frontiers.We pride ourselves on being a close-knit, collaborative team that values open communication and creative exploration. You will collaborate closely with seasoned traders and developers, receiving mentorship while being encouraged to express your perspectives, challenge ideas, and explore new avenues of inquiry collectively.

TL;DRDeducta is a rapidly expanding startup catering to some of the globe's most prestigious enterprises. With strong funding, we are committed to addressing today's most significant business challenges.We are seeking a Senior Backend Engineer who will play a pivotal role in the design, development, and upkeep of our core systems.In this role, your key responsibilities will include:Creating and sustaining high-performance, low-latency APIs for enterprise-level data processing systems.Delivering exceptional code promptly. Location: London, UK. Our office is situated near London Bridge, and we prioritize in-person collaboration. Compensation: The total compensation for this position begins at £150,000. Visa Sponsorship: We are willing to sponsor a visa for the ideal candidate to join our team. What is Deducta?Deducta is a leading data intelligence platform for global corporations. We provide unparalleled clarity into mission-critical data for some of the world's largest and most intricate organizations, starting with spend data.We are at the forefront of significant business transformations. Our partners leverage Deducta to achieve impactful results at remarkable speeds.‍What is the Role?We process vast datasets containing essential enterprise information from diverse sources and formats, structuring it effectively. Our system utilizes cutting-edge LLMs to tackle this challenge with unmatched precision and at previously unimaginable scales.As a Senior Backend Engineer, you will be responsible for designing, developing, and maintaining the foundational architecture of our platform as it expands.Your contributions will include:Designing, constructing, and maintaining data ingestion and processing engines capable of supporting mission-critical operations for the largest firms globally.Developing and sustaining ultra-fast, high-volume, and well-documented APIs to facilitate these systems.Driving business growth through a blend of creativity and experimentation to enhance our product, alongside proactive problem-solving for our clients.Working closely with both technical and non-technical team members to comprehend our customers' challenges and create solutions that address them.Success in this role means:Leading development initiatives from concept to production.Consistently driving enhancements and new features. Who will be the right fit?We are in search of a technically outstanding engineer who excels in a role that offers autonomy and ownership.You might be a great fit if you possess…Strong experience in object-oriented programming within cloud environments (e.g. AWS, GCP, or Azure), with .NET experience considered a plus.Familiarity with SOLID principles, domain-driven design, and Clean Architecture methodologies.A passion for...

Join Our Team as a Backend Engineer in LondonNote: Positions are located in London, UK — relocation and visa support available.Unleash Your PotentialAt Trade Republic, we are Europe's leading savings platform, operating across 18 nations and trusted by over 10 million customers managing more than €150 billion in assets. Our ambition extends beyond this; we are on a mission to enable everyone to build wealth through easy, safe, and free access to financial systems.As a Backend Engineer, you will collaborate with a talented team and cutting-edge technology, contributing to a future that positively impacts millions.Your ResponsibilitiesDevelop and test innovative services and products using modern JVM tools, including Kotlin, Spring, Vert.x, Hibernate, or jOOQ.Design robust cloud services emphasizing high availability, low latency, and scalability on AWS.Implement automated software delivery pipelines utilizing GitHub Actions, container-based CI/CD, and Kubernetes orchestration.What We Seek in YouA minimum of 5 years of experience in software engineering, ideally within the JVM ecosystem.We welcome candidates from mid to senior levels; whether you're looking for increased ownership or have extensive experience leading complex systems, we want to hear from you.Proven track record of developing and deploying scalable features in a service-oriented architecture.Strong commitment to delivering reliable and maintainable software through iterative development and continuous delivery.Experience in building foundational platform services that enhance product development is a plus.Ability to thrive in a flexible hybrid work environment, with 2-3 days per week in the office.Why You Should Apply NowOur culture celebrates ownership, excellence, and high energy. We are dedicated to closing the pension gap and democratizing wealth in Europe. If this resonates with you, we encourage you to reach out!