Senior Distributed Systems Engineer / Tech Lead

🏢 Summary: Senior Frontend Engineer role focused on designing and leading high-performance ad display solutions within a large-scale real-time bidding platform processing millions of requests per second. The position combines hands-on development in JavaScript/TypeScript with technical leadership in complex, cross-team projects. Work centers on performance optimization, scalability, and production system monitoring in a global AdTech environment. 🗂️ Requirements: 8+ years of experience developing complex web software, Proficiency in JavaScript and TypeScript, Strong knowledge of browser APIs, Experience with build tools such as Webpack or Vite, Practical experience with web performance optimization and advanced loading strategies, Very good knowledge of DNS, HTTP, cookies and related Internet technologies, Ability to monitor, analyze and troubleshoot production systems, Understanding of system architectures and backend API integration, Experience with CI/CD pipelines 📃 Skills: JavaScript, TypeScript, BrowserAPIs, Webpack, Vite, OpenRTB, MRAID, VAST, DNS, HTTP, Cookies, CI/CD, Monitoring, RUM, APIs, Caching 🏢 Description: 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. We are looking for engineers to join our Bidding Platform organization which is the core of the RTB business, processing over 20 million requests per second to participate in real-time auctions and display advertisements to customers from 90+ countries. If you want to work on technically complex and demanding solutions, this is the opportunity for you! Our Senior Engineers are experts who combine deep technical expertise with a strong sense of ownership, and they take on Tech Lead roles in complex, cross-team projects. You will: Gain deep understanding our ad technology and become familiar with ad industry standards: OpenRTB, MRAID, VAST etc. Design and lead implementation of high-quality frontend solutions for displaying Ads globally, focusing on performance and scalability. Write, test, and deploy robust, efficient, and well-documented code in JavaScript/TypeScript, ensuring adherence to the highest coding standards. Develop monitoring systems to track crucial metrics like reliability or viewability and use data to diagnose and resolve performance bottlenecks. Collaborate closely with Ads Layouts specialists and backend engineers to ensure smooth data flow and optimal architectural alignment for performance-critical features. Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews. Requirements: 8+ years of hands-on experience in developing complex web software Proficiency in JavaScript/TypeScript and browser APIs. Experience with relevant build tooling (e.g., Webpack, Vite). Practical experience and strong understanding of Web Performance optimization techniques and advanced loading strategies (caching, asset delivery). Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others). Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it). Good understanding of full-stack concepts, including system architectures, working with backend APIs and deployment/CI/CD pipelines. C1 level in English and Polish. Nice to have: Experience in the AdTech/Real Time Bidding space. Experience contributing to Real User Monitoring (RUM) systems. We Offer: Projects focused on extreme performance and high code quality – clean code and solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Access to modern technologies and the opportunity to apply them in large-scale, high-impact projects. Cooperation based on B2B contract. You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow.

🏢 Summary: Staff Engineer role in a high-performance Bidding Platform processing 20M+ real-time auction requests per second. The position focuses on designing and leading complex distributed systems, improving end-to-end ad workflows, and driving architectural excellence in a Deep Learning-powered AdTech environment. It combines hands-on technical leadership with ownership of large-scale, cross-team initiatives. 🗂️ Requirements: 10+ years of experience designing, developing and deploying complex software systems, 3+ years of technical leadership experience in medium or large organizations, Strong expertise in distributed systems architecture and networking fundamentals, Ability to design and lead high-performance, scalable system solutions, Experience conducting code reviews and enforcing coding standards, Fluency in English (C1), Fluency in Polish (C1) 📃 Skills: Java, Python, Aerospike, Memcached, GoogleCloudPlatform, BigQuery, MinIO, Kafka, Clickhouse, PostgreSQL, Elasticsearch, Kubernetes, Prometheus, Jenkins, Graphite, OpenRTB, MRAID, VAST 🏢 Description: Location: Poland (Remote/Flexible) 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. We are looking for engineers to join our Bidding Platform organization which is the core of the RTB business, processing over 20 million requests per second to participate in real-time auctions and display advertisements to customers from 90+ countries. If you want to work on technically complex and demanding solutions, this is the opportunity for you! Our Staff Engineers are experts who combine deep technical expertise with a strong sense of ownership, and they take on Tech Lead roles in complex, cross-team projects. You will: Gain deep understanding of our ad technology and become familiar with ad industry standards: OpenRTB, MRAID, VAST etc. Analyse issues with our end-to-end ad workflows, reproduce problematic cases, and come up with proposals for improvements Design technical and operational solutions that improve ad experience and our performance metrics Lead implementation of the aforementioned architectural solutions, ensuring its high quality, and evaluating its impact on business performance Provide hands-on technical leadership: solving complex system challenges, participating in planning and scoping of projects, and ensuring the implementation of the highest coding standards through participation in code reviews. Cooperate with stakeholders across the entire organization Requirements: 10+ years of hands-on experience in designing, developing and deploying complex software systems 3+ years of tech leadership experience (e.g. tech lead, staff, architect roles) in medium or large organizations Excellent understanding of complex, distributed IT systems - from the hardware and networking level, through software, to algorithms C1 level in English and Polish Nice to have: Experience in the AdTech/Real Time Bidding space. Selected technologies used: Java, Python Aerospike, Memcached Google Cloud Platform, BigQuery, MinIO Kafka, Clickhouse PostgreSQL Elasticsearch Kubernetes, Prometheus Jenkins, Graphite We Offer: Projects focused on extreme performance and high code quality – clean code and solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Access to modern technologies and the opportunity to apply them in large-scale, high-impact projects. Cooperation based on B2B contract. You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow.

🏢 Summary: Mid+/Senior Software Engineer role focused on designing and developing internal automation and monitoring platforms supporting a real-time bidding system. The position involves building reusable components, internal Python libraries, and scalable microservices-based solutions with strong emphasis on API design and reliability. It offers hands-on work with modern backend technologies and cloud infrastructure in a high-impact environment. 🗂️ Requirements: Solid experience in backend development with Python, Experience building platforms, frameworks, or developer tools, Experience with relational databases and writing efficient SQL queries, Hands-on experience designing RESTful or GraphQL APIs, Experience with asynchronous programming, Understanding of microservices architecture and system design, Experience writing and maintaining unit and integration tests, Ability to design scalable and extensible systems 📃 Skills: Python, FastAPI, PostgreSQL, BigQuery, GraphQL, Ariadne, SQL, Pub/Sub, Pydantic, dataclasses, Pytest, Sentry, Prometheus, Grafana, GitHub, GCP, Kubernetes, REST 🏢 Description: 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. We are looking for a Mid+/Senior Software Engineer to join our internal team at RTB House. You will work on applications and tools that directly support our real-time bidding business, collaborating with experienced engineers and product teams. This position is ideal for developers who want to grow their skills, solve real-world problems, and build reliable software that makes a visible difference. You Will: Design, develop, and maintain our internal Automation and Monitoring platforms. Design and build new, reusable components and 'steps' for our low-code automation platform, enabling teams across the company to build their own workflows. Contribute to the development of internal Python libraries and shared frameworks that are the foundation for other services. Write and maintain unit/integration tests to ensure platform reliability and code quality. Identify issues and propose improvements to enhance platform architecture, API design, and framework usability. Collaborate with other engineering teams to understand their needs and deliver new platform capabilities. Apply best practices in API design, microservices architecture, and building extensible systems. Desired Experience: Solid experience in backend development, ideally in building platforms, frameworks, or developer tools with Python. Familiarity with relational databases and ability to write efficient SQL queries. Deep understanding and hands-on experience in designing clean, extensible APIs (RESTful, GraphQL). Experience in asynchronous programming. Good understanding of system design concepts related to microservices architecture, scalability, and multi-tenant platforms. Experience with writing and maintaining tests. Problem-solving skills and the ability to work methodically through complex architectural challenges. Good communication skills and ability to work in a team. Selected Technologies: Backend: Python, FastAPI Databases: PostgreSQL, BigQuery GraphQL: Ariadne Messaging: Google Pub/Sub Data Handling & Validation: Pydantic, dataclasses Testing: Pytest Monitoring: Sentry, Prometheus, Grafana CI/CD: GitHub Actions Cloud: GCP, Kubernetes We Offer: Being part of a small team with a high degree of autonomy and decision-making Access to the latest technology in the developed solution Opportunity to build and improve our own products, where long-term quality and reliability truly matter Participation in one of the most interesting projects of the online industry in Poland and one of the fastest growing technology companies in Europe

🏢 Summary: Mid+/Senior Software Engineer role focused on building and maintaining internal automation and monitoring platforms that support real-time bidding systems. The position involves developing reusable components, internal Python libraries, and scalable APIs within a microservices architecture. The engineer will collaborate with cross-functional teams to deliver reliable, extensible backend solutions. 🗂️ Requirements: Solid backend development experience with Python, Experience building platforms, frameworks, or developer tools, Experience with relational databases and writing efficient SQL queries, Experience designing RESTful or GraphQL APIs, Experience with asynchronous programming, Understanding of microservices architecture and system design, Experience writing and maintaining unit and integration tests, Ability to design scalable and extensible systems 📃 Skills: Python, FastAPI, PostgreSQL, BigQuery, GraphQL, Ariadne, SQL, Pub/Sub, Pydantic, dataclasses, Pytest, Sentry, Prometheus, Grafana, GitHub, GCP, Kubernetes, REST, Microservices 🏢 Description: 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. We are looking for a Mid+/Senior Software Engineer to join our internal team at RTB House. You will work on applications and tools that directly support our real-time bidding business, collaborating with experienced engineers and product teams. This position is ideal for developers who want to grow their skills, solve real-world problems, and build reliable software that makes a visible difference. You Will: Design, develop, and maintain our internal Automation and Monitoring platforms. Design and build new, reusable components and 'steps' for our low-code automation platform, enabling teams across the company to build their own workflows. Contribute to the development of internal Python libraries and shared frameworks that are the foundation for other services. Write and maintain unit/integration tests to ensure platform reliability and code quality. Identify issues and propose improvements to enhance platform architecture, API design, and framework usability. Collaborate with other engineering teams to understand their needs and deliver new platform capabilities. Apply best practices in API design, microservices architecture, and building extensible systems. Desired Experience: Solid experience in backend development, ideally in building platforms, frameworks, or developer tools with Python. Familiarity with relational databases and ability to write efficient SQL queries. Deep understanding and hands-on experience in designing clean, extensible APIs (RESTful, GraphQL). Experience in asynchronous programming. Good understanding of system design concepts related to microservices architecture, scalability, and multi-tenant platforms. Experience with writing and maintaining tests. Problem-solving skills and the ability to work methodically through complex architectural challenges. Good communication skills and ability to work in a team. Selected Technologies: Backend: Python, FastAPI Databases: PostgreSQL, BigQuery GraphQL: Ariadne Messaging: Google Pub/Sub Data Handling & Validation: Pydantic, dataclasses Testing: Pytest Monitoring: Sentry, Prometheus, Grafana CI/CD: GitHub Actions Cloud: GCP, Kubernetes We Offer: Being part of a small team with a high degree of autonomy and decision-making Access to the latest technology in the developed solution Opportunity to build and improve our own products, where long-term quality and reliability truly matter Participation in one of the most interesting projects of the online industry in Poland and one of the fastest growing technology companies in Europe

🏢 Summary: The offer is for a Mid+/Senior Software Engineer to build and enhance internal automation and monitoring platforms supporting a real-time bidding business. The role focuses on backend development, reusable components, internal frameworks, and scalable microservices-based systems. It involves close collaboration with engineering teams to deliver reliable, extensible, and high-quality platform solutions. 🗂️ Requirements: Solid backend development experience with Python, Experience building platforms, frameworks, or developer tools, Ability to design clean, extensible APIs (RESTful or GraphQL), Experience with relational databases and writing efficient SQL queries, Experience in asynchronous programming, Understanding of microservices architecture and system design, Experience writing and maintaining unit and integration tests, Knowledge of scalability and multi-tenant architectures 📃 Skills: Python, FastAPI, PostgreSQL, BigQuery, GraphQL, Ariadne, SQL, Pub/Sub, Pydantic, dataclasses, Pytest, Sentry, Prometheus, Grafana, GitHub, GCP, Kubernetes 🏢 Description: 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. We are looking for a Mid+/Senior Software Engineer to join our internal team at RTB House. You will work on applications and tools that directly support our real-time bidding business, collaborating with experienced engineers and product teams. This position is ideal for developers who want to grow their skills, solve real-world problems, and build reliable software that makes a visible difference. You Will: Design, develop, and maintain our internal Automation and Monitoring platforms. Design and build new, reusable components and 'steps' for our low-code automation platform, enabling teams across the company to build their own workflows. Contribute to the development of internal Python libraries and shared frameworks that are the foundation for other services. Write and maintain unit/integration tests to ensure platform reliability and code quality. Identify issues and propose improvements to enhance platform architecture, API design, and framework usability. Collaborate with other engineering teams to understand their needs and deliver new platform capabilities. Apply best practices in API design, microservices architecture, and building extensible systems. Desired Experience: Solid experience in backend development, ideally in building platforms, frameworks, or developer tools with Python. Familiarity with relational databases and ability to write efficient SQL queries. Deep understanding and hands-on experience in designing clean, extensible APIs (RESTful, GraphQL). Experience in asynchronous programming. Good understanding of system design concepts related to microservices architecture, scalability, and multi-tenant platforms. Experience with writing and maintaining tests. Problem-solving skills and the ability to work methodically through complex architectural challenges. Good communication skills and ability to work in a team. Selected Technologies: Backend: Python, FastAPI Databases: PostgreSQL, BigQuery GraphQL: Ariadne Messaging: Google Pub/Sub Data Handling & Validation: Pydantic, dataclasses Testing: Pytest Monitoring: Sentry, Prometheus, Grafana CI/CD: GitHub Actions Cloud: GCP, Kubernetes We Offer: Being part of a small team with a high degree of autonomy and decision-making Access to the latest technology in the developed solution Opportunity to build and improve our own products, where long-term quality and reliability truly matter Participation in one of the most interesting projects of the online industry in Poland and one of the fastest growing technology companies in Europe

🏢 Summary: Mid+/Senior Software Engineer role focused on building and enhancing internal automation and monitoring platforms supporting a real-time bidding system. The position involves developing reusable components, internal Python libraries, and scalable APIs within a microservices architecture. The role emphasizes reliability, extensibility, and close collaboration with engineering teams to deliver robust platform capabilities. 🗂️ Requirements: Solid backend development experience with Python, Experience building platforms, frameworks, or developer tools, Knowledge of relational databases and writing efficient SQL queries, Experience designing RESTful or GraphQL APIs, Experience in asynchronous programming, Understanding of microservices architecture and scalability, Experience writing and maintaining unit and integration tests, Knowledge of system design for multi-tenant platforms 📃 Skills: Python, FastAPI, PostgreSQL, BigQuery, GraphQL, Ariadne, SQL, Pub/Sub, Pydantic, dataclasses, Pytest, Sentry, Prometheus, Grafana, GitHub, GCP, Kubernetes, REST, Microservices 🏢 Description: 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. We are looking for a Mid+/Senior Software Engineer to join our internal team at RTB House. You will work on applications and tools that directly support our real-time bidding business, collaborating with experienced engineers and product teams. This position is ideal for developers who want to grow their skills, solve real-world problems, and build reliable software that makes a visible difference. You Will: Design, develop, and maintain our internal Automation and Monitoring platforms. Design and build new, reusable components and 'steps' for our low-code automation platform, enabling teams across the company to build their own workflows. Contribute to the development of internal Python libraries and shared frameworks that are the foundation for other services. Write and maintain unit/integration tests to ensure platform reliability and code quality. Identify issues and propose improvements to enhance platform architecture, API design, and framework usability. Collaborate with other engineering teams to understand their needs and deliver new platform capabilities. Apply best practices in API design, microservices architecture, and building extensible systems. Desired Experience: Solid experience in backend development, ideally in building platforms, frameworks, or developer tools with Python. Familiarity with relational databases and ability to write efficient SQL queries. Deep understanding and hands-on experience in designing clean, extensible APIs (RESTful, GraphQL). Experience in asynchronous programming. Good understanding of system design concepts related to microservices architecture, scalability, and multi-tenant platforms. Experience with writing and maintaining tests. Problem-solving skills and the ability to work methodically through complex architectural challenges. Good communication skills and ability to work in a team. Selected Technologies: Backend: Python, FastAPI Databases: PostgreSQL, BigQuery GraphQL: Ariadne Messaging: Google Pub/Sub Data Handling & Validation: Pydantic, dataclasses Testing: Pytest Monitoring: Sentry, Prometheus, Grafana CI/CD: GitHub Actions Cloud: GCP, Kubernetes We Offer: Being part of a small team with a high degree of autonomy and decision-making Access to the latest technology in the developed solution Opportunity to build and improve our own products, where long-term quality and reliability truly matter Participation in one of the most interesting projects of the online industry in Poland and one of the fastest growing technology companies in Europe

🏢 Summary: Senior Technical Researcher/Engineer role focused on researching, prototyping, and evaluating cutting-edge AdTech technologies for large-scale systems. The position combines deep technical research, programming, and experimentation to assess feasibility and integrate new solutions, including privacy mechanisms and mobile optimizations. You will build PoCs and collaborate cross-functionally to enhance performance, compliance, and ML-driven capabilities. 🗂️ Requirements: 5+ years experience as researcher or engineer, Strong programming skills, Ability to understand large-scale systems and architectures, Experience building Proof of Concepts, Ability to evaluate and integrate new technologies, Experience with privacy mechanisms and browser technologies, Experience with mobile platforms Android and iOS, Collaboration with cross-functional technical teams 📃 Skills: Python, Java, Scala, TypeScript, JavaScript, PyTorch, NumPy, Pandas, Jupyter, BigQuery, GCP, DeepLearning, MachineLearning, Android, iOS, GitHub 🏢 Description: 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. You Will: As a Senior Technical Researcher/Engineer within the AdTech Technical Research Team , you'll play a pivotal role in exploring and understanding the latest technologies in the ad tech domain. You'll be responsible for conducting in-depth research, experimenting with new technologies, and collaborating with cross-functional teams to assess their potential for integration into our systems. Your role will involve a blend of programming, research, and analytical skills to evaluate the effectiveness and feasibility of various ad tech solutions. Desired Experience: 5+ years of experience as researcher or engineer. Strong technical proficiency: programming skills and the ability to understand large and complex systems and architectures. Openness and willingness to experiment & learn: readiness to take on new challenges, explore new technologies, and continuously expand knowledge in the ad tech domain. Independence & proactive attitude: ability to take initiative, make decisions, and act without excessive supervision while maintaining a high standard. Goal-oriented mindset: focus on achieving specific project goals and adaptability in a dynamic environment. Collaboration & communication: ability to work effectively with teammates and other teams, clearly sharing knowledge and cooperating with external organizations (e.g. major browser vendors, W3C, GitHub discussions). Ability to build Proof of Concepts (PoCs): creating prototypes and experimental solutions to evaluate effectiveness and utility. Selected Technologies & Projects: Python, Java, Scala, TypeScript/JavaScript PyTorch, NumPy, Pandas Jupyter Notebooks BigQuery, GCP Browser Engines Assessing new privacy mechanisms (e.g. Privacy Sandbox APIs) by building PoCs, testing, and suggesting improvements (via GitHub issues or meetings). The goal is to evaluate their feasibility, ensure compliance, and enhance user privacy. Exploring solutions for Android and iOS, including creating prototypes to improve performance on mobile platforms. This requires close collaboration with other teams and leveraging ML opportunities. Many more — including your own ideas! We Offer: Compensation: an attractive salary and career growth opportunities Technology: access to the latest technologies and real opportunity to use of them in a large-scale and highly dynamic projects; extensive and rich datasets Impact: your contribution will directly influence the company's business results and outcomes globally, while also giving you the chance to mentor less experienced colleagues in the team Wellbeing: extremely flexible conditions – you act when it is convenient for you and devote as much time as you can; you can operate fully remotely Culture: be part of a team of enthusiasts with wide experience in ML who willingly share their knowledge and learnings on a daily basis, no BS 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.

🏢 Summary: Technical leadership role focused on building and scaling an AI Engineering Lab that develops multi-agent systems and internal tools powered by LLMs to enhance engineering productivity. The position combines hands-on software development, architectural decision-making (build vs. integrate), and full lifecycle ownership from prototyping to production. The role emphasizes high-performance system design, AI integration in production, and cross-functional collaboration. 🗂️ Requirements: High proficiency in Python, Significant experience with at least one of: Java, Go, TypeScript, Scala, Hands-on experience integrating LLMs into production environments, Proven ability to evaluate third-party tools vs custom-built solutions, Experience designing distributed systems and multi-agent architectures, Ability to define technical roadmaps and drive high-level system design, C1 level English, C1 level Polish 📃 Skills: Python, Java, Go, TypeScript, Scala, LLM, AgenticAI, LangChain, AutoGen, Vercel, MCP, AWS, GCP, Azure, Docker, Kubernetes, DistributedSystems, API 🏢 Description: We are: RTB House is a global company that provides state-of-the-art marketing technologies for top brands and agencies worldwide. Our proprietary ad-buying engine is the first in the world to be powered entirely by Deep Learning algorithms, enabling advertisers to achieve outstanding results and meet their goals at every stage of the funnel. Join RTB House and lead our AI Engineering Lab, a team dedicated to pioneering innovation and boosting engineering productivity by leveraging the latest advancements in Agentic AI. We are looking for a hands-on technical leader with a strong, traditional software engineering background. In this role, you won't just be writing custom code from scratch. You will be an architect of efficiency. Our approach is highly pragmatic: we build internal tools and autonomous agents to supercharge our engineering workflows. You will be expected to navigate the "build vs. buy/integrate" landscape, determining when to leverage off-the-shelf LLM products and when to architect a custom, high-performance solution. You will: Drive Technical Excellence: Act as a technical pillar within the Lab, implementing high-standard code and sophisticated system designs. You will mentor mid-level peers and lead deep-dive code reviews. Architect Multi-Agent Systems: Design and deploy distributed systems and multi-agent architectures that automate complex engineering tasks. You will own the architectural decisions for "build vs. integrate" strategies. Innovate with Agentic AI: Spearhead the evaluation and prototyping of LLMs, Agentic frameworks, and Model Context Protocols (MCPs). You will transform theoretical AI advancements into production-ready tools. Own the Full Lifecycle: Take responsibility for the entire development cycle. From initial concept and API integration to production deployment and long-term scalability. Influence Product Strategy: Partner with Product and Engineering Managers to ensure the Lab’s innovations align with the broader company roadmap and provide measurable ROI to our developers. Desired experience: Pragmatic Architect: Proven ability to evaluate third-party tools and vendor solutions against custom-built software to find the most efficient path forward. Technical Stack: High proficiency in Python is mandatory. Significant experience with at least one other language (Java, Go, TypeScript, or Scala) is highly preferred. AI/ML Implementation: Hands-on experience integrating LLMs into production environments. Systems Thinker: Ability to define technical roadmaps for specific features and drive high-level design choices that prioritize maintainability and performance. C1 level in English and Polish. Nice to have: Direct experience building internal developer tools, custom Model Context Protocols (MCPs), or using Agentic AI frameworks (e.g., Vercel AI SDK, LangChain, AutoGen, Agent Development Kit). Experience with cloud platforms (AWS, GCP, Azure) and containerization technologies (Docker, Kubernetes). Familiarity with the ad-tech industry and real-time bidding (RTB) systems. We offer: Projects focused on extreme performance and high code quality – clean code and solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Access to modern technologies and the opportunity to apply them in large-scale, high-impact projects. Cooperation based on B2B contract. You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow.

🏢 Summary: Technical leadership role focused on building and scaling an AI Engineering Lab that develops internal tools and multi-agent systems to enhance engineering productivity. The position combines hands-on software engineering with architecture design, LLM integration, and build-vs-buy decision making. You will drive end-to-end development of Agentic AI solutions from prototype to production in a high-performance environment. 🗂️ Requirements: High proficiency in Python, Significant experience with at least one of: Java, Go, TypeScript, Scala, Hands-on experience integrating LLMs into production environments, Experience designing distributed systems and multi-agent architectures, Ability to evaluate third-party tools vs custom-built solutions, Experience with system design and defining technical roadmaps, Ability to lead code reviews and mentor engineers, C1 level English, C1 level Polish 📃 Skills: Python, Java, Go, TypeScript, Scala, LLM, AgenticAI, LangChain, AutoGen, Vercel, MCP, AWS, GCP, Azure, Docker, Kubernetes, APIs, DistributedSystems 🏢 Description: We are: RTB House is a global company that provides state-of-the-art marketing technologies for top brands and agencies worldwide. Our proprietary ad-buying engine is the first in the world to be powered entirely by Deep Learning algorithms, enabling advertisers to achieve outstanding results and meet their goals at every stage of the funnel. Join RTB House and lead our AI Engineering Lab, a team dedicated to pioneering innovation and boosting engineering productivity by leveraging the latest advancements in Agentic AI. We are looking for a hands-on technical leader with a strong, traditional software engineering background. In this role, you won't just be writing custom code from scratch. You will be an architect of efficiency. Our approach is highly pragmatic: we build internal tools and autonomous agents to supercharge our engineering workflows. You will be expected to navigate the "build vs. buy/integrate" landscape, determining when to leverage off-the-shelf LLM products and when to architect a custom, high-performance solution. You will: Drive Technical Excellence: Act as a technical pillar within the Lab, implementing high-standard code and sophisticated system designs. You will mentor mid-level peers and lead deep-dive code reviews. Architect Multi-Agent Systems: Design and deploy distributed systems and multi-agent architectures that automate complex engineering tasks. You will own the architectural decisions for "build vs. integrate" strategies. Innovate with Agentic AI: Spearhead the evaluation and prototyping of LLMs, Agentic frameworks, and Model Context Protocols (MCPs). You will transform theoretical AI advancements into production-ready tools. Own the Full Lifecycle: Take responsibility for the entire development cycle. From initial concept and API integration to production deployment and long-term scalability. Influence Product Strategy: Partner with Product and Engineering Managers to ensure the Lab’s innovations align with the broader company roadmap and provide measurable ROI to our developers. Desired experience: Pragmatic Architect: Proven ability to evaluate third-party tools and vendor solutions against custom-built software to find the most efficient path forward. Technical Stack: High proficiency in Python is mandatory. Significant experience with at least one other language (Java, Go, TypeScript, or Scala) is highly preferred. AI/ML Implementation: Hands-on experience integrating LLMs into production environments. Systems Thinker: Ability to define technical roadmaps for specific features and drive high-level design choices that prioritize maintainability and performance. C1 level in English and Polish. Nice to have: Direct experience building internal developer tools, custom Model Context Protocols (MCPs), or using Agentic AI frameworks (e.g., Vercel AI SDK, LangChain, AutoGen, Agent Development Kit). Experience with cloud platforms (AWS, GCP, Azure) and containerization technologies (Docker, Kubernetes). Familiarity with the ad-tech industry and real-time bidding (RTB) systems. We offer: Projects focused on extreme performance and high code quality – clean code and solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Access to modern technologies and the opportunity to apply them in large-scale, high-impact projects. Cooperation based on B2B contract. You can cooperate 100 % remotely or choose one of our office spaces in Warsaw or Cracow.

🏢 Summary: QA Tech Lead role focused on designing and scaling the overall testing strategy for frontend and backend systems within a self-service AdTech platform. The position involves building automated testing frameworks, integrating QA processes into CI/CD and cloud environments, and leading technical standards across the quality lifecycle. It combines strategic ownership of QA architecture with hands-on automation and exploratory testing. 🗂️ Requirements: 5+ years of QA experience with automation architecture design, Experience in at least 2 different organizations, Proficiency in Python or TypeScript for test automation, Strong knowledge of API testing and frontend automation patterns, Experience integrating tests into CI/CD pipelines, Experience with cloud environments, Ability to use AI tools for test automation and documentation, Experience owning or organizing QA processes, Knowledge of Git, Linux basics, Strong SQL skills, English B2+, Polish B2+ 📃 Skills: Python, TypeScript, Pytest, Playwright, Cypress, FastAPI, Django, Kubernetes, GCP, Docker, PostgreSQL, AlloyDB, BigQuery, SQL, Git, Linux, GraphQL 🏢 Description: Location: Poland We Are: RTB House is a next-generation performance demand-side platform (DSP) that uses proprietary Deep Learning AI algorithms to help brands grow. The company is the market leader in driving performance using Deep Learning across the entire purchase 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. Our Product Tools team is responsible for developing and maintaining self-service platforms for managing advertising campaigns with advanced reporting and forecasting capabilities — used by both internal and external users. As a QA Tech Lead , you will play a pivotal role in designing the quality strategy and technical foundations of our testing ecosystem. If you enjoy building frameworks and setting technical standards across the full quality spectrum, this role is for you. You Will: Architect and oversee the overall testing strategy for both frontend and backend systems. Design, develop, and scale automated testing frameworks using Python or TypeScript (e.g., Pytest, Playwright, Cypress). Drive the technical evolution of our QA processes, ensuring they are integrated into the CI/CD pipeline and cloud infrastructure. Perform high-level exploratory testing of complex new features, providing feedback on system design and edge cases. Collaborate as a technical peer with developers, architects, and product stakeholders to ensure quality is built-in from the design phase. Mentor the team in best practices for testability, automation patterns, and defect management. Requirements: Must have At least 5 years of experience in QA roles, with a proven track record of designing automation architectures. Experience in at least 2 different companies/organizations, demonstrating exposure to diverse technical environments and challenges. Strong proficiency in either Python or TypeScript for test automation. Deep understanding of modern software architecture, API testing, and frontend automation patterns. Experience using AI to work smarter . Use AI tools (LLMs, agents, coding assistants) to speed up writing test scripts, generating edge-case data, and documenting created artefacts Experience in owning or organizing QA processes at a team or department level. A "Lead" mindset: willingness to balance high-level strategy with hands-on automation and exploratory testing. Technical fluency: Git, Linux basics, and solid SQL skills. Languages: English (B2+), Polish (B2+). Nice to have Experience in building/scaling QA chapters in fast-growing engineering teams. Deep knowledge of CI/CD pipelines and cloud-native environments (GCP, Docker, Kubernetes). Performance and load testing expertise. Experience with GraphQL and BigQuery. UX-oriented mindset — advocating for the end-user by asking "is this what customers will love?" rather than just "does it meet the spec?" Selected Technologies: Python Cypress FastAPI/Django TypeScript Kubernetes Google Cloud Platform PostgreSQL AlloyDB BigQuery We Offer: 100% remote — collaboration from anywhere in Poland or from our offices in Warsaw or Kraków Flexible collaboration model — we trust you to manage your time Shape the QA process — with a small QA team, you'll have a direct impact on how testing is done Influence the product — we cooperate closely with users, developers, and UX designers; your voice matters in the final shape of what we ship Freedom in tooling — we're open to adopting better tools and technologies when there's a good case for it Stable tech company — RTB House is an AI/ML-driven product company with a long-term perspective Collaboration with flexible contract options (B2B or contract of mandate) 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.