Senior Backend Engineer - AI Platform (f/m/d)

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.

Join Contentful as a Senior Platform Engineer and be part of a dynamic team dedicated to creating scalable and efficient software solutions. In this role, you will leverage your expertise to enhance our platform, ensuring optimal performance and reliability. You will collaborate closely with cross-functional teams, driving innovation and excellence in our engineering practices.

Backend Platform EngineerWe are looking for a talented Platform Engineer to join our elite team at mlabs, a pioneering software development firm leading the charge in the fintech and digital asset industries. Our organization is a major contributor to one of the world's largest and most dynamic crypto social networks, having generated upwards of $600 million in revenue since early 2024. At the crossroads of high-scale social coordination and decentralized finance, we are committed to revolutionizing the future infrastructure.This role is crucial to maintaining the security, scalability, and integrity of our platform, which is attracting global attention. The ideal candidate will enhance our backend engineering and infrastructure security, executing robust controls across a complex cloud and blockchain ecosystem.Key Responsibilities:Pipeline Security: Develop and maintain a secure CI/CD pipeline, integrating automated security checks throughout the development lifecycle.Infrastructure as Code (IaC): Design and implement infrastructure following IaC principles while adhering to security best practices.Security Automation: Automate security scanning and monitoring of our cloud and blockchain infrastructure for real-time threat detection and mitigation.Container Security: Establish and manage advanced security protocols for high-throughput containerized environments.Observability & Metrics: Create and sustain comprehensive security dashboards to monitor and report on our security posture.Cross-Functional Collaboration: Work alongside development teams to address security issues and enhance code-level security standards.Secrets & Key Management: Design and implement sophisticated solutions for secrets management and cryptographic key handling.Configuration Baselines: Set and enforce secure configuration baselines across our entire cloud infrastructure.

About Our TeamJoin our innovative AI Platform team at realtimeboardglobal, where we are at the forefront of Miro’s AI-powered product vision. We are dedicated to developing the internal platform, tools, and APIs that empower Miro’s product teams to integrate and scale AI applications seamlessly. Our mission is to create a robust and adaptable technical foundation for AI innovation, enabling our teams to work efficiently, innovate responsibly, and deliver exceptional AI features to our users.Your RoleAs a Senior Backend Engineer within our AI Platform team, you will play a pivotal role in constructing and enhancing the core infrastructure that powers AI across Miro. You will establish the technical groundwork for how we develop, deploy, and manage AI/ML capabilities, serving tens of millions of users as we transition into an increasingly intelligent product. You will design internal tools that allow teams to experiment with and release AI features swiftly and responsibly, as well as manage data pipelines for AI applications. This is a unique opportunity to influence how AI is developed and embraced company-wide.

Join our dynamic Data Processing Product Area at Spotify, where we create innovative platforms and tools that transform the way we process, manage, and leverage data on a massive scale. Our team empowers various departments within Spotify to tackle intricate data challenges with assurance. We emphasize enhancing efficiency, quality, and innovation, enabling engineers and data professionals to accelerate their work while ensuring reliability and cost-effectiveness.

Role Overview Spotify is looking for a Backend Engineer to join the Data Platform team in London. This position focuses on building and improving the backend systems that power Spotify’s data processing and analytics. The work supports a seamless experience for millions of listeners around the globe. What You Will Do Develop and maintain scalable backend systems for data processing and analytics. Work closely with cross-functional teams to optimize Spotify’s data infrastructure. Help ensure high availability and strong performance across backend services. About the Team The engineering team at Spotify values collaboration and technical excellence. The Data Platform group plays a key role in supporting the company’s ability to deliver music and insights at scale.

Wheely provides premium transportation services in major cities across Europe, the US, and the Middle East. The company supports over 100,000 active riders and 1,200 corporate clients, combining advanced technology with professional chauffeuring. With $43M in funding and annual revenue exceeding $100M, Wheely continues to grow, recently expanding into New York City. Role overview The Senior Backend Engineer, Platform, joins a team responsible for building and maintaining the foundational systems that power Wheely’s engineering organization. This group develops shared tools, manages significant migrations (such as moving away from a Ruby monolith), and works to strengthen the company’s infrastructure. The team emphasizes lightweight frameworks and clean, maintainable code, relying on practices like Test-Driven Development (TDD), Domain-Driven Design (DDD), and continuous integration and delivery. Technology stack Go (Golang) as the primary language Ruby monolith (legacy, currently being migrated away from) PostgreSQL and MongoDB for databases RabbitMQ and Redis for messaging and caching gRPC and Thrift for APIs and protocols AWS, Kubernetes, and Terraform for cloud and infrastructure Interview process Initial recruiter screening Algorithm assessments Live coding exercises Systems design discussions For senior candidates, a structured review of previous experience and achievements Wheely seeks engineers who care about their craft and want to contribute to the platform as the company continues to grow.

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 Wise as a Senior Software Engineer I, where you will play a crucial role in developing and enhancing our Acquiring Platform. As a backend engineer specializing in Java, you will collaborate with cross-functional teams to create reliable, scalable, and innovative software solutions that will help us deliver exceptional payment experiences to our users.

About usOwkin is a pioneering AI company dedicated to unraveling the complexities of biology. Our goal is to develop the first Biology Super Intelligence (BASI) by integrating advanced biological large language models, diverse patient data, and intelligent software. Central to our innovation is Owkin K, an AI copilot, and our specially fine-tuned LLM, Owkin Zero, which researchers, clinicians, and drug developers utilize to gain deeper insights into biology, validate scientific hypotheses, and accelerate the delivery of improved diagnostics and therapies.Please submit your CV in EnglishAbout the role:As a Senior AI Backend Engineer at Owkin, you will be instrumental in developing our leading Agentic AI product for biomedical researchers by merging robust engineering practices with state-of-the-art AI technologies. You will engage with a real-time system that integrates LLMs, tool-calling, and interactive UI elements, ensuring our users can interact seamlessly with intricate, domain-specific data.This position demands a balance of traditional engineering principles and innovative methodologies as you integrate LLMs and AI into our technology stack. If you are passionate about building and enhancing a dynamic product, this opportunity is tailor-made for you.Your expertise and experience will be vital in steering our multidisciplinary team towards strategic choices and empowering your colleagues.In particular, you will:Collaborate within a multidisciplinary team of product managers, designers, software engineers, machine learning experts, and biomedical scientists.Design, build, and maintain scalable, reliable AI systems.Drive technical decisions and provide context-aware solutions for AI systems in biological research.Leverage and pioneer evaluation methodologies to ensure continuous product enhancement.Experiment with cutting-edge industry solutions, including orchestration patterns, fine-tuning, specialized monitoring, feedback loops, and more.Lead core stack component development with a focus on sustainability, scalability, security, reliability, and performance.Foster team growth by sharing your expertise and mentoring colleagues through code reviews, technical discussions, and knowledge sharing.About you...

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.

Join Spotify's dynamic team as a Senior Backend Engineer focused on our innovative Commerce Platform. In this role, you will be instrumental in developing and optimizing backend solutions that drive our core commerce functionalities. Collaborate with cross-functional teams to enhance user experiences, improve system performance, and ensure robust scalability.

Role Overview Writer is hiring a Senior Software Engineer to help build and improve our Enterprise AI Platform. Based in London, this role centers on designing and developing software that supports efficiency and better user experiences for a range of clients. What You Will Do Develop and maintain software for our Enterprise AI Platform Work with cross-functional teams to deliver reliable and scalable solutions Contribute ideas and technical expertise to shape the direction of AI products at Writer Collaboration This position works closely with engineers, product managers, and other teams to ensure our software meets client needs and quality standards. Your input will help guide the evolution of AI tools within the company.

About UsAt Heidi, we are pioneering an AI Care Partner that assists healthcare professionals at every stage, from documentation to patient care delivery. Our mission is to enhance healthcare capacity while maintaining a deeply human touch. In just 18 months, we have reclaimed over 18 million hours for clinicians and facilitated more than 73 million patient visits. Currently, Heidi powers over two million patient interactions weekly across 116 countries in more than 110 languages.Founded by healthcare professionals, Heidi unites clinicians, engineers, designers, scientists, creatives, and mathematicians, all dedicated to enhancing the human connection central to healthcare. With nearly $100 million in funding, we are expanding our reach in the USA, UK, Canada, and Europe, collaborating with major health systems, including the NHS and Beth Israel Lahey Health, among others.We are agile in our approach, focused on what works, and poised to shape the future of healthcare. Are you ready to take on this challenge?Your RoleAs a Senior Backend Engineer, you will be instrumental in executing backend features, leveraging your deep technical understanding to meet user requirements. You will thrive in a hyper-growth startup environment, with substantial experience in building SaaS products.With a solid grasp of the challenges engineers face, you will prioritize key features and capabilities through effective design principles. Your ability to bridge technical specifics with business needs will enable you to transform high-level concepts into practical solutions.Embracing challenging scenarios, you will appreciate the dynamics of a flexible, flat-structured work environment and quickly navigate the complexities of developing AI healthcare products on an international scale. We believe that exceptional talent can emerge from diverse backgrounds; if you have a proven history of delivering technically demanding products and features, we want to hear from you.

Senior Full‑Stack/AI Engineer (Backend-leaning)About Us:At AND Digital, we are a forward-thinking tech company committed to enhancing digital delivery and bridging the digital skills gap. Since our inception in 2014, we have partnered with organizations to create exceptional digital products and to strengthen their digital teams.Our mission is to leave a lasting legacy for our clients. We achieve this by fostering close relationships within our regional offices or ‘Clubs’, ensuring that our partners receive priority service from a dedicated local team.This innovative approach has led to significant success for both our clients and ourselves, as demonstrated by our impressive organic growth since 2014. We now boast over 1,300 talented individuals across Clubs throughout the UK and Europe, with ambitious plans for global expansion in the coming years.Join us on our mission to close the world’s digital skills gap!What You Will Contribute:Core Technical Skills:Extensive hands-on experience in backend engineering, proficient in one or more languages such as Java, Node.js, TypeScript, Python, or Go, with the flexibility to work across multiple languages as necessary.Proven track record in designing and implementing scalable, resilient, and maintainable backend systems, including REST/GraphQL APIs, event-driven architectures, and distributed services.Hands-on experience with AWS (including services such as Lambda, ECS, DynamoDB, SQS/SNS, API Gateway, Step Functions, etc.) and a strong grasp of cloud-native patterns. Familiarity with GCP, Azure, or other cloud platforms is a plus.Solid experience in Infrastructure as Code (preferably Terraform), CI/CD pipelines, and modern deployment methodologies.Comfortable working across the entire tech stack, contributing to frontend codebases when required, while maintaining a primary focus on backend and systems engineering.Demonstrates technical leadership by shaping architectural direction, reviewing designs, and exemplifying high-quality engineering practices.A strong foundation in system design, including trade-off analysis, performance considerations, observability, and operational readiness.Able to take ownership of complex technical challenges, make pragmatic decisions, and articulate reasoning effectively to both technical and non-technical stakeholders.AI & Emerging Technologies:Hands-on experience integrating AI into backend systems, such as orchestrating AI services, creating AI-driven workflows, or utilizing AI tools to enhance engineering productivity.Experience in developing AI-enabled systems (including solutions based on LLM or RAG) from MVP or proof-of-concept to production-ready implementations, with an emphasis on reliability, evaluation, security, and maintainability.Ability to discern where AI can meaningfully enhance backend systems (e.g., classification, summarization, anomaly detection) as opposed to traditional algorithms.

About Light.At Light, we are on a mission to transform outdated factory-era ERPs into dynamic, living software. Our Smart Financial Platform equips modern, global businesses with capabilities like automated accounting, real-time reporting, and financial workflows that evolve with their pace.Creating alongside our customers, we prioritize speed and craftsmanship. In a short span, we've evolved from a concept to a vital resource for renowned companies such as Lovable, Legora, and Keyshot. Our users don’t just work with Light—they enjoy using it.As a pioneering team, we are creating a new software category. Imagine engineers passionate about finance, designers focused on reconciliation, and operators treating finance as a product. If you’re enthusiastic about revolutionizing financial workflows, you’re in the right place.Supported by top-tier investors and guided by industry leaders, we are developing groundbreaking products with the freedom to innovate boldly and take ownership of our results. Join us in making Light the global standard for next-gen finance.The AI Platform Engineer RoleAs a member of the Foundation Team, which acts as the catalyst for our engineering organization, you will play a pivotal role in architecting our internal

Corgi is an insurance carrier designed for tech startups, using AI to make underwriting and operations more efficient. With $108 million in funding and full licensing, Corgi is expanding into the UK and EU. The core platform runs on Django and uses Stripe for payments, blending strong engineering with insurance expertise. Role overview This Senior Backend Engineer role is based in London. The position centers on building and deploying products, often independently and without a fixed roadmap. Engineers who have shipped live projects, whether through side work, weekend builds, or prior roles, are especially valued. Key responsibilities Independently design, build, and launch backend systems and features. Turn ideas into production-ready products within tight timelines. Work with a Django-based stack, integrating Stripe and AI-driven workflows. Adapt to new technical challenges as the company grows. What Corgi looks for Proven ability to build and ship impactful projects independently. Comfort working at a startup pace, delivering results in hours or days. Ability to work across the stack and solve a range of technical problems. Strong opinions paired with openness to feedback and new ideas. Focus on outcomes and results rather than titles or hierarchy. High energy, collaborative spirit, and humility. How work happens at Corgi Quick decision-making, prioritizing action over waiting for perfect solutions. Products and improvements ship regularly, not just on a set schedule. Iterative development is preferred over long review cycles. Momentum is maintained even outside of major launches. Transparency is standard; decisions are made openly. Internal competition is encouraged to raise standards for everyone. This is a hands-on position for engineers who want to build and make an impact. Behaviors that lead to removal Office politics, blame-shifting, or gossip. Taking feedback personally rather than constructively. Introducing unnecessary bureaucracy. Missing deadlines after making commitments. How to apply Send links to your GitHub, personal website, or live projects you have shipped. CVs are not required. Email applications to: sergio@corgi.com Evidence of shipped work is required. Location and compensation London-based role, with on-site or hybrid options. Salary range: £75,000 to £140,000, plus equity. Salary depends on demonstrated ability to ship, not job title.

Who We AreLightning AI is the innovative force behind PyTorch Lightning, established in 2019. We provide a comprehensive platform designed to streamline the development, training, and deployment of AI systems, effectively bridging the gap between research and production.Our merger with Voltage Park, a neocloud and AI Factory, empowers us to combine developer-centric software solutions with economical, large-scale computing capabilities. We equip teams with essential tools for experimentation, training, and production inference, ensuring built-in security, observability, and control.We cater to solo researchers, startups, and large enterprises alike, operating globally with offices in cities such as New York City, San Francisco, Seattle, and London. Our efforts are supported by notable investors including Coatue, Index Ventures, Bain Capital Ventures, and Firstminute.What We’re Looking ForWe are seeking a skilled Backend Engineer to develop and enhance the Lightning AI platform across various components, from the frontend and CLI to API, billing, security, and integrations. You will take full ownership of key features, driving development from concept to production while collaborating with a talented team of engineers, product managers, and designers. This role offers the chance to create groundbreaking technology that will revolutionize the machine-learning ecosystem!This hybrid position is based in our London office with a requirement of 2 in-office days per week. The salary range for this role is $120,000 - $250,000.

Join Us at ConveoAt Conveo, we are pioneering an AI research platform that facilitates rapid, cost-effective, and high-quality consumer and B2B research. Our innovative AI video interviewer is trusted by global brands such as Unilever, Google, and Orange, empowering insights across marketing and product teams.Why This Role MattersTraditional research methods are often slow, costly, and lack depth. They require specialized expertise, which can be a barrier for many organizations. By addressing these challenges, we enhance how companies comprehend and serve their customers.Your Future TeamYou will be part of an exceptionally skilled and passionate team dedicated to pushing boundaries while enjoying our work. Our collective experience spans decades in market research, engineering excellence, and entrepreneurship.Our Work CultureWe prioritize our clients and the solutions we offer, consistently going above and beyond.Our engineering team collaborates directly with customers, fostering open communication.We balance hard work with fun, creating an energetic atmosphere.To maintain our high standards, we strive for a lean but effective team.About the RoleThis position transcends a traditional infrastructure role; we seek an individual who is adept at strengthening Kubernetes clusters, contributing to product features, and developing internal tools that enhance our product and engineering capabilities. As a Senior Platform Engineer, you will own the infrastructure and deployment platform that powers Conveo's AI research product while influencing the engineering approach. You will establish AI toolchains, workflows, and safeguards that allow our engineers to operate efficiently with automation and AI.This is a critical role with significant impact. You will build upon existing foundations and elevate how Conveo builds, deploys, and manages our systems at scale. As we expand from 8 to over 18 engineers this year, you will ensure our infrastructure evolves in tandem with our growth and customer needs.

About 9fin9fin is revolutionizing the global debt markets with its cutting-edge AI platform, catering to the world’s largest asset class valued at over $145 trillion.The debt markets are extensive, international, and essential, yet they are often hindered by disjointed data, PDFs, and manual processes. 9fin transforms this outdated framework by providing a unified platform that consolidates proprietary credit data, in-depth analysis, and streamlined workflows across global markets.Currently, 9fin supports over 300 prestigious institutions worldwide, including leading banks, asset managers, private equity firms, law firms, and advisory companies. Our rapid growth is marked by significant expansion in the US and an exceptional retention rate driven by extensive workflow adoption.We are at a pivotal moment in our journey. With a proven product-market fit and substantial global demand, 9fin is on the path to becoming the definitive platform for debt markets globally.What You'll Work OnYou will lead technical projects, defining and designing systems, swiftly creating proof of concepts, and collaborating closely with Product and our clients.Develop code and guide your team in delivering new service functionalities, implementing APIs, managing data routing/processing, and establishing automation mechanisms.Your primary focus will be on backend services and the web applications that support the 9fin platform.Assume a leadership role within project teams, conducting code reviews and mentoring junior developers, while also participating in early research and experimentation with new technologies to inform new features and products.Continuously enhance the 9fin codebase by automating, refactoring, and documenting when possible.Diversity is key: Our web platforms encompass a wide range of areas, including complex financial data modeling, environmental and energy data capture, integration of ML/AI prediction services, and data visualization and automation systems.Collaboration is vital: We form cross-functional teams for every project, incorporating the necessary domain expertise from 9fin in finance, law, and editorial. Your ability to convey complex projects to non-technical audiences will foster productive and efficient team collaboration.Developer Experience: By managing automated processes and enhancing the development environment, you will help improve the overall experience for developers.