Senior Frontend Software Engineer

🏢 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: Senior Engineer role focused on designing and leading high-performance, highly scalable components of a real-time bidding platform processing over 20 million requests per second. The position involves building, optimizing and maintaining distributed HTTP/gRPC services and batch jobs in Java and Python, while ensuring observability, reliability and top engineering standards. The role combines deep technical expertise with hands-on leadership in complex, cross-team projects. 🗂️ Requirements: Excellent understanding of complex IT systems from hardware to algorithms, Very good knowledge of Internet protocols (DNS, HTTP, cookies), Knowledge of concurrent programming and distributed systems, Ability to monitor, analyze and troubleshoot production systems, Ability to analyze and optimize system performance, Knowledge of high scalability and high availability concepts, Fluent English and Polish (C1) 📃 Skills: Java, Python, DNS, HTTP, gRPC, Aerospike, Memcached, GCP, BigQuery, MinIO, Kafka, Clickhouse, PostgreSQL, Elasticsearch, Kubernetes, Prometheus, Jenkins, Graphite 🏢 Description: 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 Senior Engineers to support 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: Design and lead implementation of system changes that deliver high performance, scalability and observability for displaying and tracking ads world wide. Develop tools and optimizations to drive measurable improvements in critical user performance metrics. Implement, test, deploy, monitor and maintain (in all aspects, including setting up environment, writing configuration code, monitor production) HTTP / gRPC services and batch jobs in Java and Python, ensuring adherence to the high engineering standards. 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: Excellent understanding of how complex IT systems work - from the hardware level, through software, to algorithms. Very good knowledge of fundamental Internet protocols and technologies (DNS, HTTP, cookies and others). Good knowledge of basic methods of creating concurrent programs and distributed systems (from thread level to geo-distributed clusters level). Practical ability to observe, monitor and analyse the operation of production systems (and draw valuable conclusions from it). The ability to critically analyze the solutions created in terms of performance (from estimating the theoretical performance of the designed systems to detecting and removing actual performance problems in production). General knowledge of issues (typical problems and methods of solving them) in the areas of 'high scalability' and 'high availability'. 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. 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 – solid code reviews are our standard. Collaboration within an interdisciplinary, self-sufficient team (including DevOps, database experts, backend developers, product designers, and QA engineers). Hardware and software tailored to your preferences (e.g., MacBook, AI tool licenses). Flexible working conditions – no core hours, fully remote cooperation possible.

🏢 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: Senior TypeScript Engineer role focused on designing, developing, and maintaining internal tools and libraries using modern TypeScript-based technologies. The position involves building web applications, shaping the tech stack, and solving complex engineering challenges in a Deep Learning-driven AdTech environment. The offer includes work on globally scaled projects with strong emphasis on innovation and continuous development. 🗂️ Requirements: Strong knowledge of TypeScript, Strong knowledge of Node.js, Experience with NestJS, Experience with React, Experience with Next.js, Experience with Google Cloud Platform (GCP), Experience with Docker, Minimum 5 years of professional experience with listed technologies, Knowledge of OOP principles, Knowledge of clean code and clean architecture, Familiarity with design patterns, Experience writing unit tests, Experience writing end-to-end tests, Very good knowledge of Git, Very good knowledge of Linux, Solid understanding of SQL, Communicative level of English 📃 Skills: TypeScript, Node.js, NestJS, React, Next.js, GCP, Docker, Git, Linux, SQL, OOP, TDD 🏢 Description: 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 drives performance using Deep Learning across the entire purchase funnel and offers end-to-end Deep Learning-powered AdTech products and solutions to maximize conversion, drive customer acquisition, create engagement, and fuel long-term demand for a global client base. Description: As a Senior TypeScript Engineer, you will design, develop, and maintain internal tools and libraries that support teams across the organization. You will work with modern frameworks and libraries, shape the tech stack for each project, and solve complex development challenges requiring creativity and innovation. Responsibilities: - Develop and maintain internal tools using various technologies. - Build web applications (TypeScript) that support team workflows. - Design, develop, and maintain internal TypeScript libraries. - Select and adapt suitable libraries and frameworks for each project. - Solve complex development challenges with a problem-solving approach. Desired Experience: - Strong knowledge of TypeScript and Node.js. - Experience with NestJS. - Hands-on experience with React / Next.js. - Experience with Google Cloud Platform (GCP). - Experience with Docker. - Minimum of 5 years of professional experience with the above technologies. - Knowledge of OOP principles, clean code, and clean architecture. - Familiarity with design patterns and ability to apply them. - Experience in writing unit tests and end-to-end tests. - Very good knowledge of Git and Linux. - Solid understanding of SQL. - Communicative level of English. - Independence, proactivity, and eagerness to learn and grow. Nice to Have: - Knowledge of Google Analytics or Google Tag Manager. - Previous experience in the AdTech/Advertising industry. Benefits: - Opportunity to contribute to a high-impact online project with global reach. - Hands-on experience in RTB and innovative online advertising solutions. - Development-focused tasks with strong emphasis on continuous learning and skill improvement.

🏢 Summary: Senior TypeScript Engineer role focused on designing, developing, and maintaining internal tools and libraries to support organizational workflows. The position involves building TypeScript-based web applications, shaping the tech stack, and solving complex development challenges using modern frameworks and cloud technologies. The role emphasizes clean architecture, testing, and scalable solutions in a cloud environment. 🗂️ Requirements: Minimum 5 years of professional experience with TypeScript and Node.js, Strong knowledge of TypeScript and Node.js, Experience with NestJS, Hands-on experience with React or Next.js, Experience with Google Cloud Platform, Experience with Docker, Knowledge of OOP principles and clean architecture, Ability to apply design patterns, Experience writing unit tests and end-to-end tests, Very good knowledge of Git, Very good knowledge of Linux, Solid understanding of SQL, Communicative level of English 📃 Skills: TypeScript, Node.js, NestJS, React, Next.js, GCP, Docker, SQL, Git, Linux, OOP 🏢 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. As a Senior TypeScript Engineer , you will play a key role in designing, developing, and maintaining internal tools and libraries that support our teams across the organization. You will have the opportunity to work with the latest frameworks and libraries, shape the tech stack for each project, and tackle complex development challenges that require creativity and innovation. You Will: Develop and maintain internal tools using a variety of technologies. Build web applications (TypeScript) that support team workflows. Design, develop, and maintain internal TypeScript libraries. Select and adapt the most suitable libraries and frameworks for each project. Solve complex development challenges with a creative, problem-solving approach. Desired Experience: Strong knowledge of TypeScript and Node.js . Experience with NestJS . Hands-on experience with React / Next.js . Experience with Google Cloud Platform (GCP) . Experience with Docker . Minimum of 5 years of professional experience with the above technologies. Knowledge of OOP principles, clean code, and clean architecture. Familiarity with design patterns and the ability to apply them. Experience in writing unit tests and end-to-end tests. Very good knowledge of Git and Linux . Solid understanding of SQL . Communicative level of English . Independence, proactivity, and eagerness to learn and grow. Nice to Have: Knowledge of Google Analytics or Google Tag Manager . Previous experience in the AdTech/Advertising industry . We Offer: The opportunity to contribute to one of the most exciting online projects in Poland with global reach. Hands-on experience in RTB , the fastest-growing and most innovative area of online advertising. Development-focused tasks and a strong emphasis on continuous learning and skill improvement. 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: 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: 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