Senior Backend Engineer at Kiefer | Athens

Join Kiefer Tech, a pioneering force in the technology sector, where we harness over 12 years of engineering expertise from the Green Energy domain to craft innovative AI, robotics, and enterprise solutions throughout Greece and the EU. Our mission is to construct sovereign AI infrastructure that upholds data privacy within EU borders while driving substanti…

Join Kiefer Tech as a Senior Security Engineer, the first dedicated security hire on the Sophea platform. In this pivotal role, you will integrate security as a fundamental engineering capability, enhancing cloud infrastructure, securing AI attack surfaces, and embedding automated security practices throughout the development lifecycle. Your expertise will enable fast and confident deployments, steering clear of compliance and policy writing.Key Responsibilities:Perform comprehensive security assessments and create a prioritized remediation roadmap for infrastructure and services.Enhance security in AWS and Kubernetes environments, focusing on IAM, network policies, workload isolation, and secrets management.Secure AI-specific attack surfaces by implementing defenses against prompt injection, handling PII in LLM pipelines, and preventing data leakage.Integrate automated security measures into CI/CD processes, including dependency scanning, container image scanning, code analysis, and secrets detection.Design secure-by-default communication patterns for services, authentication processes, and data management.Develop incident response capabilities, including detection, alerting, response workflows, and post-incident reviews.Collaborate with engineering teams to enhance the security posture while ensuring smooth operations.

Join Kiefer Tech, a pioneering technology company that leverages over 12 years of engineering expertise in the Green Energy sector to drive innovation in AI, robotics, and enterprise solutions across Greece and the EU. We are dedicated to creating sovereign AI infrastructures that prioritize data privacy and deliver significant business outcomes. Our commitment to innovation, quality, and enduring partnerships empowers us to develop industry-leading AI infrastructure, including Greece's first Large Language Models and intelligent automation solutions.As an IT Manager, you will play a vital role in our rapidly expanding AI product environment. This is not merely a support role; you will be a builder, establishing and managing internal IT frameworks that enhance productivity and scalability. Your focus will be on creating automated systems that facilitate company growth and ensuring seamless integration with our product ecosystem.

Join Kiefer Tech, the innovative technology wing of Kiefer, where we harness over 12 years of engineering expertise in the Green Energy sector to craft state-of-the-art AI, robotics, and enterprise solutions across Greece and the EU. Our commitment to building sovereign AI infrastructure ensures that data remains within EU borders, adhering to privacy standards while delivering substantial business outcomes. Driven by our core values of innovation, quality, and fostering long-term client relationships, we are pioneers in creating enterprise-grade AI infrastructure, including the first true Greek Large Language Models and intelligent automation solutions that empower organizations to excel. Through our strategic partnership with NVIDIA, we merge sustainable infrastructure know-how with leading-edge AI technology, cultivating an ecosystem that encourages innovation, bolsters Greece's technological sovereignty, and drives significant impact across various industries. Become a part of our mission to shape the AI-driven world of tomorrow.About the Role:We are on the lookout for a Senior Product Designer to enhance our design processes across multiple product streams and scale design output within our AI product ecosystem.Your Responsibilities:Craft exceptional UX/UI designs for our AI-powered product offeringsCollaborate closely with Product Managers and Engineering teams to ensure timely feature deliveryProduce clear, implementation-ready design assetsEnhance usability and consistency across our product suiteContribute to the development of design patterns and reusable componentsFacilitate quicker product iteration cyclesYour Qualifications:Minimum of 4 years of experience in Product Design / UX/UIStrong UX design thinking coupled with structured problem-solving skillsProficient in Figma or similar design toolsAbility to manage multiple priorities effectivelyExperience in collaborating with engineering teamsPractical mindset focused on delivery

Join Kiefer Tech, the innovative technology division of Kiefer, as we harness over a decade of engineering excellence from the Green Energy sector to craft advanced AI, robotics, and enterprise solutions throughout Greece and the EU. Our commitment to developing sovereign AI infrastructure ensures data remains within EU borders, prioritizing privacy while generating substantial business value. With a focus on our core values of innovation, quality, and fostering enduring client relationships, we are proud to create enterprise-level AI infrastructures, the first Greek Large Language Models, and intelligent automation solutions that empower organizations to succeed.We are seeking a dedicated Senior DevOps Engineer to join our team as the first infrastructure hire for the Sophea platform. In this role, you will play a pivotal part in standardizing deployment pipelines, establishing comprehensive observability, and expanding infrastructure-as-code practices across our services. Your mission is to enhance the consistency, reliability, and scalability of our enterprise production environment.Our Technology Stack: Our environment features over 10 Python (FastAPI) and TypeScript microservices deployed on AWS (EKS, App Runner, ECR), complemented by PostgreSQL, Redis, OpenSearch, Kafka, and S3.

Kiefer Tech is the technology division of Kiefer, drawing on over 12 years of engineering experience in the Green Energy field. The team designs and delivers AI, robotics, and enterprise solutions for clients throughout Greece and the European Union. Project work includes building sovereign AI infrastructure with a focus on data privacy, deploying enterprise automation, and developing Greece’s first production-ready Large Language Models. Kiefer Tech emphasizes technical quality, innovation, and long-term relationships with clients. The company has a strategic partnership with NVIDIA, which brings together sustainable infrastructure and advanced AI systems. This collaboration aims to support Greece’s technological independence and deliver real-world benefits across multiple industries.

Join our dynamic team at Kiefer Tech, the technological arm of Kiefer, renowned for over 12 years of pioneering work in the Green Energy sector. We are at the forefront of developing innovative AI, robotics, and enterprise solutions across Greece and the EU. Our commitment to crafting sovereign AI infrastructure ensures that data remains within EU borders, prioritizing privacy while delivering measurable business outcomes. Guided by our core principles of innovation, quality, and long-term partnerships, we create enterprise-grade AI frameworks, including Greece’s first authentic Large Language Models and intelligent automation solutions that empower organizations to succeed. Our strategic alliance with NVIDIA enhances our sustainable infrastructure expertise with world-class AI technology, fostering an ecosystem of innovation that bolsters Greece’s technological sovereignty and generates significant impact across various industries. Become a part of our mission to build the AI-powered world of tomorrow.We are on the lookout for a Senior QA Engineer to help establish robust testing methodologies and ensure product reliability in preparation for our enterprise launch.

Join Kiefer Tech, a pioneering technology firm in the Green Energy sector with over 12 years of engineering excellence. We specialize in developing advanced AI, robotics, and enterprise solutions, ensuring data sovereignty within the EU. Our commitment to privacy and impactful business results drives our mission to create cutting-edge AI infrastructure, including the first true Greek Large Language Models and intelligent automation solutions. Collaborating with NVIDIA, we aim to enhance Greece’s technological sovereignty and innovation landscape. Be part of our journey to shape the AI-powered future.Your Role:As a Senior Machine Learning Engineer, you will be instrumental in designing, optimizing, and scaling our AI systems that power the Sophea and Kiefer multi-product platform. This position requires a blend of hands-on ML engineering expertise and collaborative systems thinking. You will focus on production-grade ASR pipelines, enhancing Greek-language LLM performance, and developing cost-effective inference solutions while establishing technical benchmarks and elevating our ML practices organization-wide.Your contributions will significantly enhance product performance, customer satisfaction, and our capacity to deploy AI solutions across various public and enterprise sectors in Greece and beyond.Key Responsibilities:Develop and scale production-grade ASR and LLM pipelines, optimizing throughput, latency, and reliability while ensuring compliance with data sovereignty requirements.Enhance model performance through dataset-centric optimizations, broadening Greek-language capabilities and domain-specific expertise.Architect and implement scalable multi-agent AI systems to automate complex enterprise document analyses and decision-making processes.Lead cost and performance optimization efforts for model inference, utilizing techniques like quantization, caching, and intelligent routing to lower costs.Establish and maintain ML engineering standards, including evaluation frameworks, CI/CD practices, testing protocols, and mentorship initiatives within the ML team.

Join Kiefer Tech as a People Operations Manager in Athens, where you will play a pivotal role in shaping our team culture and enhancing our people operations. This dynamic position merges hands-on responsibilities with strategic process ownership, collaborating closely with leadership to streamline contracts, onboarding, payroll coordination, and employee experiences.In this foundational role, you will take charge of structuring and executing people operations locally. While payroll, accounting, and legal compliance are managed with external partners, your focus will be on fostering effective communication, operational excellence, and a positive employee experience.Your Responsibilities:Design and implement core people processes, ensuring their effective adoption through proactive communication and structured execution.Manage employment contracts and HR documentation in accordance with Greek labor legislation.Coordinate payroll processes with external accountants and payroll providers.Lead employee onboarding and offboarding processes, guaranteeing a seamless experience.Support performance tracking and people processes, including goal setting and feedback cycles.Organize internal team events and initiatives to enhance team engagement.Maintain HR records, ensuring compliance with local labor regulations.

Join Skroutz, where our mission is to deliver extraordinary experiences. Since our inception in 2005, we have believed that satisfied customers lead to satisfied merchants, driving us to understand and fulfill their needs while providing a seamless shopping journey.Our ambition is to transform into the Everyday App, the preferred platform for millions to meet their online shopping requirements. From the latest smartphone to essential pantry items, stylish outfits, or collectible gaming consoles, Skroutz is your reliable partner for effortless shopping.With aspirations that extend beyond Greece, we are on the path to becoming one of Europe's fastest-growing Marketplaces, with exciting ventures underway in Cyprus and the Balkans. Our commitment to customer satisfaction shapes every decision we make.We are looking for passionate individuals who thrive in the intersection of e-commerce and technology. If your drive is to create remarkable shopping experiences for users while enabling sellers globally to thrive, we want you on our team.At Skroutz, be a part of a transformative journey that redefines online shopping. Together, let’s turn everyday moments into exceptional experiences.Are you ready for the challenge?#AimToAmazeOur Engineering ValuesMaster your craft and take pride in your work.Deliver early and iterate based on feedback.Collaborate and be proactive within your team.Avoid over-engineering and focus on simplicity.Enjoy the process and celebrate achievements.Technologies We UseOur primary stack includes Ruby for backend development, utilizing the Ruby on Rails framework, alongside Javascript (ES6) and React/Redux for frontend. We leverage a MariaDB cluster for storage, with extensive use of Elasticsearch, Kafka, MongoDB, Redis, and Memcached. Jenkins is our go-to for CI, and we utilize tools like Sentry, DataDog, and Grafana for monitoring purposes. We consistently seek the most effective tools tailored to our needs. Discover more about our projects on our Engineering blog.Your Contribution to Skroutz's VisionWe are searching for Senior Backend Software Engineers with a robust technical background...

Join Kaizen GamingAt Kaizen Gaming, the driving force behind Betano, we are proud to be one of the leading GameTech companies globally, with operations spanning 20 diverse markets. Our commitment lies in leveraging state-of-the-art technology to deliver unparalleled experiences for millions of customers who rely on us for their entertainment.Our vibrant team consists of over 2,700 talented individuals from more than 40 nationalities across three continents.Recognized as one of the Best Workplaces in Europe and certified as a Great Place to Work in all our offices, we guarantee that no two days will ever be the same. Are you ready to Press Play on Your Potential?About the RoleAs a Backend Engineer, you will be an integral part of an autonomous Agile team, collaborating closely with the Product Owner, Agile Delivery Lead, Automation Testers, and fellow Software Engineers to create a competitive edge for Kaizen and provide an exceptional online experience for our customers.At Kaizen, our software engineers are entrusted with a variety of projects, ranging from customer-facing websites and mobile applications to internal tools and backend services, all designed to handle high traffic and volume.Your ResponsibilitiesDevelop innovative solutions from the ground up, guiding them from concept to production.Transform requirements into efficient and sophisticated technological systems, leveraging our large-scale, highly available infrastructure.Design, build, and maintain efficient, reusable, and reliable code.Explore new technologies to identify effective solutions for everyday challenges.Deliver high-value features rapidly.Question the status quo and drive improvements for both the team and the product.Technology StackOur platforms primarily utilize C# / ASP.NET, with new services developed in .NET Core. Contemporary applications employ Vue.js for the frontend, while legacy systems utilize server-rendered (Razor) views combined with jQuery and Knockout.js. We predominantly rely on MS SQL Server for data storage, supplemented by Redis and ElasticSearch when applicable. RabbitMQ serves as our primary message broker, and we use GitLab for code versioning and continuous integration, alongside the Atlassian suite for issue tracking and documentation.

Are you excited about the power of Artificial Intelligence? At Satori Analytics, we are dedicated to transforming industries through innovative Data & AI solutions. Our mission is to empower global brands by providing unparalleled clarity and insights, utilizing cutting-edge technologies. Our diverse range of services spans from developing cloud-based ecosystems for fintech to creating predictive models for the airline industry, covering the entire data lifecycle—from data ingestion to AI implementation.As a rapidly expanding scale-up, our talented team of over 100 professionals—including Data Engineers, Data Scientists, and other tech experts—delivers pioneering analytics solutions for various sectors, including FMCG, retail, manufacturing, and financial services. Join us as we spearhead the data revolution in South-Eastern Europe and beyond!Ready to collaborate with one of Greece's largest energy companies?Your Daily Responsibilities:Design, construct, and maintain backend services that address real-world business challenges, guiding projects from concept to production.Engage in the complete software development lifecycle—from gathering requirements to deploying and managing systems in a live environment.Monitor, diagnose, and enhance production systems and cloud infrastructure utilizing observability tools.Work closely with product teams and stakeholders to translate business requirements into precise, actionable technical solutions.

Join the dynamic team at FINARTIX as a passionate Backend Application Developer. Contribute to innovative projects across various sectors, playing a vital role in developing, implementing, and managing technology-driven business solutions that enhance our clients' delivery approaches. Key Responsibilities Engage in the complete software development lifecycle, including the implementation, testing, and maintenance of custom applications. Adhere to established standards for programming, security, and performance while ensuring thorough code documentation. Act as a technical consultant to clients, providing expert advice and support. Assist both business and IT users with existing applications to ensure optimal performance. QualificationsBachelor's or Master's degree in Computer Science, Engineering, or a related field is required.A minimum of 3 years of experience in Software Engineering.Strong proficiency in Backend Engineering with the .Net Framework.Hands-on experience with various database technologies, including SQL, NoSQL, and Vector.Familiarity with Web Services (SOAP/REST) and Application Servers (IIS).Understanding of system frameworks such as Git and Azure DevOps (ADO), as well as container technologies like Docker or Kubernetes.Previous experience in Infrastructure Architecture and support is a plus.Cloud Services certification (AWS, Azure, GCP) is an added advantage.Exceptional programming skills and a creative approach to problem-solving.Excellent communication and time management skills.Proficient in both English and Greek, with strong written and verbal capabilities.BenefitsProfessional development through engaging, real-world projects across diverse industries.Work within a rapidly-growing technology company with esteemed partners.Opportunity to collaborate with talented colleagues in a diverse environment.Competitive salary package.Comprehensive private health insurance.Access to training and development opportunities.Company laptop provided.Flexible work environment.

Established in 2018, Causaly is revolutionizing the realm of enterprise-level scientific research with our innovative AI platform. Our technology empowers researchers to efficiently discover, visualize, and interpret vital biomedical knowledge while automating essential research workflows, thus accelerating the solutions to some of the most pressing health challenges of our time.We partner with leading biopharma companies and institutions, addressing diverse use cases in Drug Discovery, Safety, and Competitive Intelligence. For more insights on how we enhance knowledge acquisition and decision-making, explore our blog posts here: Blog - CausalySupported by prestigious venture capital firms including ICONIQ, Index Ventures, Pentech, and Marathon, we are on a mission to transform research outcomes in the biomedical field.About the TeamWe are seeking skilled AI engineers to join our dynamic team, utilizing generative AI and intelligent agents to help scientists uncover novel insights from extensive biomedical literature and datasets.Delivering an accelerated research experience demands more than merely adopting the latest LLM model; it requires building trust with our users through integrating effective guardrails, biomedical curation, consistent updates, and robust deployment practices—ensuring our platform meets all the research needs of our users.We invite AI engineers who are passionate about this mission to apply AI in reshaping how biomedical professionals conduct their research and daily explorations.Your Responsibilities· Design and implement comprehensive ML/AI solutions from conception through deployment and monitoring, balancing innovative techniques with practical considerations to achieve measurable outcomes.· Employ sound software engineering practices, including modular design, testing, code reviews, CI/CD, and observability, to ensure AI systems are dependable, maintainable, and production-ready, while being adaptable to future needs.· Select the optimal approach for each challenge, evaluating traditional ML and NLP techniques, LLM-based solutions, and agentic strategies to weigh trade-offs between speed, cost, complexity, interpretability, and performance.· Collaborate closely with product, design, and engineering teams to define project scopes, establish success metrics, and iteratively enhance user-facing features powered by AI.

The Sportsbook Area within Product Development is expanding rapidly, and we are on the lookout for a talented Backend Software Engineer to join our world-class Sportsbook team. Our platform, meticulously crafted in-house, is gaining traction not only in new markets but also as a B2B offering. With our product available globally, we provide around-the-clock support to enhance the experience for users betting on various sports.Our Product Development organization boasts a truly global presence, featuring cross-functional teams across five Tech Hubs: Malta, Budapest, Stockholm, Tallinn, and Athens. Life at Betsson Group is akin to a thrilling rollercoaster ride—fast-paced, full of unexpected turns, and always exhilarating. Our diverse team of over 2,800 colleagues from more than 75 nationalities collaborates daily to tackle new challenges and seize opportunities for growth. If you thrive in an innovative environment and enjoy pushing boundaries, you will find your place among us.As a vital member of our Sportsbook tech team—a high-performance group focused on delivering optimal functionality and user experience in the iGaming sector—you will play a key role in ensuring our platform meets the demands of our brands serving over 20 different markets. Join us in our mission to create unmatched performance and functionality in the industry!

Become a part of Intralot as a Senior Cloud Engineer!As a vital member of our Enterprise IT team, you will play an instrumental role in the management and deployment of cloud and enterprise IT solutions.Key ResponsibilitiesDesign, implement, and oversee cloud solutions utilizing Azure.Provide support for Microsoft 365 (M365) services as part of our enterprise IT operations.Work collaboratively with IT Infrastructure teams to seamlessly integrate cloud services into our enterprise applications.Continuously monitor and enhance the performance of cloud and IT infrastructure.Administer and fine-tune Jira for effective project and task management across IT teams.

Join Our Journey at Welcome!Established in 2015 in Athens, Greece, Welcome is revolutionizing travel experiences by offering more than just a transfer service. We are pioneers in delivering a comprehensive and personalized journey for travelers from their arrival to their departure. Welcome Pickups caters to every travel need, providing seamless transfers, engaging sightseeing tours, and invaluable local insights in the most user-friendly and personalized manner. Our drivers are not just transporters; they are local experts who enhance travelers' experiences, making them feel at home no matter where they are. Our commitment to safety is paramount, featuring contactless rides, stringent cleaning protocols, and protective equipment for every journey.As a rapidly growing travel tech startup, Welcome is quickly establishing itself as a global leader in in-destination travel services.Rated 4.9/5 stars, we are among the highest-rated global transportation companies.We service over 300 destinations with plans to expand to 350 by 2024.Our network includes over 4,000 travel partners, including 2,500 hotels and numerous vacation rentals, welcoming over 50 new partners each month.We delight over 2.5 million travelers annually.⭐ Dive deeper into the culture of Welcome by visiting our TikTok account.⭐About Our TeamOur team is a vibrant mix of diverse individuals passionate about travel and dedicated to quality. Each member is committed to Welcome's vision and works tirelessly to achieve it. We think outside the box, prioritize design and usability, and strive to create unforgettable experiences. We are committed to continuous learning and personal and professional growth while maintaining a humble, 'pay it forward' mindset and ambitious goals.Role OverviewAs a Backend Software Engineer, you will play a pivotal role in transforming our vision into tangible products. Your contributions will directly impact the travel experience for users, drivers, and partners. You will be responsible for enhancing our tech infrastructure and optimizing the code that powers our production servers, ensuring a flawless user experience.In the past 18 months, our full-stack approach has yielded remarkable results. Our engineers focus primarily on back-end development, working on logic, APIs, and databases, while also having the capability to build functional UI using React.

Join Intralot as a Senior Network EngineerYour Responsibilities:As a Senior Network Engineer, you will be instrumental in delivering top-tier (3rd level) technical support for network-related challenges in our international projects.Key Responsibilities Include:Network Monitoring and Maintenance: Maintain and oversee network equipment across all sites, swiftly responding to alerts and outages.Contribute to the architecture and deployment of innovative solutions while bolstering the resilience of existing network environments.Establish and manage network infrastructures by designing system configurations, overseeing system installations, and defining, documenting, and enforcing system standards.Optimizing Network Performance:Enhance network performance by monitoring metrics, troubleshooting issues and outages, and orchestrating upgrades.Optimize and configure routing, switching, and load-balancing devices.Upgrade network equipment to the latest stable firmware versions.Documentation and Housekeeping:Implement and coordinate necessary housekeeping activities.

Curious about the experience of being a .NET Developer (Mid-Senior) at Netcompany? Join our high-performing engineering team to deliver enterprise-level digital solutions.In this pivotal role, you will design and develop scalable applications while collaborating closely with senior engineers, architects, and product stakeholders. This position is perfect for developers who possess robust backend development experience and aspire to deepen their technical skills while making significant contributions to large-scale systems.Your work will focus on complex enterprise platforms where quality, maintainability, and performance are paramount. You will take ownership of technical tasks, engage in architectural discussions, and uphold high engineering standards across the team.As a .NET Developer (Mid-Senior), your responsibilities will include:Crafting, developing, and maintaining scalable and secure enterprise applications utilizing .NET / C#.Implementing and maintaining RESTful APIs, ensuring optimal performance, reliability, and security.Translating business requirements into well-structured and maintainable technical solutions.Writing clean, testable, and reusable code that adheres to best practices and coding standards.Engaging in architectural discussions and technical design reviews.Collaborating with senior developers and architects on system design and enhancements.Conducting code reviews and contributing to the improvement of team coding standards.Working closely with product owners, QA engineers, and other stakeholders.Participating in Agile/Scrum ceremonies, sprint planning, and estimations.Contributing to testing strategies, CI/CD processes, and application performance enhancements.

Join Workable, the leading provider of an all-in-one HR suite designed for over 31,000 businesses and HR teams. Our innovative solution combines the globally recognized Applicant Tracking System (Workable Recruiting) with a comprehensive employee management system (Workable HR). At Workable, we empower organizations to prioritize what matters most: recruiting the right talent and nurturing their development.We pride ourselves on our vibrant and collaborative culture, where talented individuals thrive while having fun, learning, innovating, and assisting others in their growth. We respect every team member, hire top talent, and ensure every experience is memorable.We are expanding rapidly and are seeking a Senior Software Engineer to enhance our Product team!Our engineering culture is robust, emphasizing customer-centric design. We are involved in a variety of stimulating application development areas, including web and mobile applications, infrastructure, performance optimization, UI/UX design, integration with numerous web services, API development, modern front-end frameworks, scalability, video technology, natural language processing, data science, and usability engineering. We practice Agile methodology and test-driven development daily!Our technology stack includes Rails, Node, Python, and Java applications utilizing PostgreSQL, MongoDB, RabbitMQ, Redis, and Elastic, all deployed on Kubernetes and GCP. We are on the lookout for developers across all domains of SaaS application development, with various teams focusing on different aspects from core applications to mobile/tablet applications and beyond. We'll align you with the right team based on your expertise and interests.