Senior Software Engineer

RTB House

Location: Poland   We Are: RTB House is a global company that provides state-of-the-art marketing technologies for top brands and agencies worldwide. Its proprietary ad-buying engine is the first in the world to be powered entirely by Deep Learning algorithms, enabling advertisers to generate outstanding results and reach their goals at every stage of the funnel. Founded in 2012, and now operating in 90+ markets, RTB House has always been private-by-design. It embraces first-party advertising and a relentless approach to innovation. RTB House offers end-to-end Deep Learning-powered AdTech products and solutions to maximize conversion, drive new customer acquisition, create engagement, and fuel long-term demand for a global base of clients. Desired Experience: * Expertise in designing and implementing complex IT systems. * Ability to develop user-friendly, versatile tools. * Proficiency in at least one programming language, such as Python, C++, Java, or Scala, along with expertise in Linux. * Strong skills in evaluating and optimizing system performance, from initial design through to production troubleshooting. * Deep understanding of algorithms and data structures. * Initiative and creativity to improve existing solutions. * Ability to work effectively both within and across teams. * C1 level in Polish Additional Advantages: * Previous experience in the field of Machine Learning is not required, but would be an asset. * Solid foundation in mathematics. * Experience with GPU programming and Machine Learning frameworks such as Torch, PyTorch, or TensorFlow. * Proven experience with distributed systems. * Familiarity with Big Data technologies such as Hadoop, Kafka, Storm, Spark, or Flink. * Hands-on experience with Google Cloud Platform (GCP) or similar cloud providers. We Offer: * The opportunity to cooperate with a team of enthusiasts experienced in Machine Learning, Big Data, and distributed systems, who are eager to share their knowledge and skills. * Flexible cooperate hours, with the possibility of remote cooperate or cooperate from our office in Warsaw. * Access to the latest technologies, with the opportunity to apply them in a large-scale and fast-paced project. * An opportunity to apply your expertise in optimizing algorithms that support hundreds of millions of internet users and billions of ad views per month within the RTB model. * The ability to see the immediate impact of your cooperate on the company's business outcomes. * The possibility of publishing your results. * Cooperation based on B2B contract or Contract of Mandate * You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow. Daily Responsibilities: * Developing and maintaining the ML training platform and the bidding infrastructure that evaluates ML models in the production environment. * Identifying performance bottlenecks and optimizing critical, low-level parts of the system. * Ensuring the reliability and scalability of implementations, and creating performance and correctness tests for new system components. * Testing and benchmarking open-source Big Data and ML technologies to assess their suitability for the production environment.   Apply now! You don't need to tick every box to apply. If you are passionate about digital marketing, send us your CV, and we'll review it.

RTB House

Location: Poland   We Are: RTB House is a global company that provides state-of-the-art marketing technologies for top brands and agencies worldwide. Its proprietary ad-buying engine is the first in the world to be powered entirely by Deep Learning algorithms, enabling advertisers to generate outstanding results and reach their goals at every stage of the funnel. As an ML Researcher, you will be responsible for its development. Founded in 2012, and now operating in 90+ markets, RTB House has always been private-by-design. It embraces first-party advertising and a relentless approach to innovation. RTB House offers end-to-end Deep Learning-powered AdTech products and solutions to maximize conversion, drive new customer acquisition, create engagement, and fuel long-term demand for a global base of clients. You Will: * Designing and implementing models, most often of deep neural networks, used to predict the behavior and preferences of Internet users * Analysis of the latest works in the field of Machine Learning * Conducting and analyzing A/B tests of new solutions * Developing and testing new approaches to modeling key issues, such as bidding in first-price auctions Desired Experience: * 4+ years of hands-on experience with Machine Learning / Data Science  * Interest and willingness to constantly develop in the area of Machine Learning * Knowledge of statistics and probability * Proficiency in programming * C1 level in Polish Selected technologies used: * Python, Java, Scala * PyTorch, NumPy, Pandas * Jupyter Notebooks Additional advantages will be: * Experience in the ML industry * Experience in designing recommendation systems * Practical knowledge of the tools we use Sample topics: * Implementation and analysis of new model architectures, such as convolutional networks, transformer * Analyze the difference in the distribution of training and production data. Estimating the scale of the problem, identifying the best solution, analysis, implementation, deployment * Experiments with the use of transfer learning * A completely new approach to generating product recommendations that is free from proxy targets and uses contrastive loss function We Offer:   * Cooperate in a team of enthusiasts with experience in machine learning who willingly share their knowledge and skills * Extremely flexible cooperation conditions - you cooperate when it is convenient for you and devote as much time as you can; you can cooperate fully remotely * Access to the latest technologies and the possibility of real use of them in a large-scale and highly dynamic project; * Possibility of using the possessed knowledge and competences in practical applications - while optimizing algorithms supporting hundreds of millions of Internet users and monthly buyers of billions of advertising views in the RTB model, based on extensive data sets * The effects of your cooperate immediately visible in the company's business results * Possibility to publish your results * Cooperation based on B2B contract or Contract of Mandate  * You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow. Apply now! You don't need to tick every box to apply. If you are passionate about digital marketing, send us your CV, and we'll review it.

Tink AB

Visa’s Technology Organization is a community of problem solvers and innovators reshaping the future of commerce. We operate the world’s most sophisticated processing networks capable of handling more than 65k secure transactions a second across 80M merchants, 15k Financial Institutions, and billions of everyday people. While working with us you’ll get to work on complex distributed systems and solve massive scale problems centered on new payment flows, business and data solutions, cyber security, and B2C platforms. The Opportunity:  We are looking for Versatile, curious, and energetic Software Engineers who embrace solving complex challenges on a global scale. As a Visa Software Engineer, you will be an integral part of a multi-functional development team inventing, designing, building, and testing software products that reach a truly global customer base. While building components of powerful payment technology, you will get to see your efforts shaping the digital future of monetary transactions.  The Work itself:  Design code and systems that touch 40% of the world population while influencing Visa’s internal standards for scalability, security, and reusability Collaborate multi-functionally to create design artifacts and develop best-in-class software solutions for multiple Visa technical offerings Actively contribute to product quality improvements, valuable service technology, and new business flows in diverse agile squads Develop robust and scalable products intended for a myriad of customers including end-user merchants, b2b, and business to government solutions. Leverage innovative technologies to build the next generation of Payment Services, Transaction Platforms, Real-Time Payments, and Buy Now Pay Later Technology Opportunities to make a difference on a global or local scale through mentorship and continued learning opportunities  Essential Functions: Demonstrates relevant technical working knowledge to understand requirements. Identifies and contributes to the development and solution strategies to team members that improve the design and functionality of interface features across one or more project features, under minimal guidance. Applies standard processes on the use of programming languages (e.g. HTML, C++, Java) to write code that fulfills website modification requests and technical requirements. Collaborates with others to support the piloting of new technology capabilities and features that enhance the user website experience across e-commerce products. Analyzes bugs for simple issues and applies debugging tools to verify assumptions. The Skills You Bring: Energy and Experience: A growth mindset that is curious and passionate about technologies and enjoys challenging projects on a global scale Challenge the Status Quo: Comfort in pushing the boundaries, “hacking” beyond traditional solutions Language Expertise: Expertise in one or more general development languages (e.g., Java, C#, C++) Builder: Experience building and deploying modern services and web applications with quality and scalability Learner: Constant drive to learn new technologies such as Angular, React, Kubernetes, Docker, etc. Partnership: Experience collaborating with Product, Test, Dev-ops, and Agile/Scrum teams   Qualifications:  Basic Qualifications  Bachelor's degree in Math, Science, Engineering, or Computer Science, Information Systems or related field AND minimum five (5) years of experience in a directly related field. OR Master's degree in Math, Science, Engineering, or Computer Science, Information Systems or related field AND minimum three (3) years of experience in a directly related field. OR Minimum eight (8) years of directly related experience.   Preferred Qualifications  Programming Languages: Knowledge of and ability to develop front-end code (e.g. HTML, CSS, and JavaScript) in support of package and product development. This includes the extension of capabilities of packages and products. Web Browser Optimization: The ability to select the "best available" values of some objective function to improve the functional effectiveness of web browsers. User Interface Design: Knowledge of user interface design, which is the interaction where users and computers interact. This includes an understanding of how to provide an optimal industrial design experience through User Interface (UI) Design. API Generation: The ability to develop and apply Application Program Interfaces (APIs), a set of routines, protocols, and tools for building software applications that specify how software components should interact and are used when programming graphical user