Backend Engineer (B2B) - Warsaw

Location: Warsaw, Poland — Hybrid (4 days on-site / 1 day remote)Contract: B2B · 25–40 k PLN net / month + RSUsFresha: Innovating the Beauty & Wellness SectorBecome a part of Fresha, the premier marketplace platform revolutionizing the beauty and wellness industry on a global scale. With a network of over 120,000 businesses and 450,000 stylists who trust our…

Waymo is at the forefront of autonomous driving technology, striving to become the world’s most trusted driver. Originating from the Google Self-Driving Car Project in 2009, our focus has been on developing the Waymo Driver—The World’s Most Experienced Driver™—to enhance mobility access and prevent traffic-related fatalities. The Waymo Driver is the driving force behind Waymo’s fully autonomous ride-hailing service, having completed over ten million rider-only trips while autonomously covering more than 100 million miles on public roads and tens of billions in simulated environments across 15+ U.S. states.The Waymo Mapping team is dedicated to creating a high-resolution map of the world to facilitate safe autonomous driving. Our innovative mapping process combines automated and manual techniques, along with robust infrastructure for data storage, processing, and distribution. We collaborate closely with various teams within Waymo that utilize map data.Your Responsibilities:Develop and enhance essential labeling tools and systems that drive mapping initiatives at Waymo.Partner with Mapping Operations, UX, and engineering teams to deliver outstanding internal tools.Collaborate with machine learning teams to integrate advanced models into our workflow, significantly increasing scalability.Construct backend infrastructure for the effective storage and processing of diverse map data.Utilize Google's ecosystem to build, deploy, and scale backend services that manage extensive mapping data.Expand systems to map urban environments, supporting Waymo’s rapid growth into new and complex cities.Your Qualifications:Bachelor’s degree or equivalent practical experience.A minimum of 3 years of relevant industry experience.Proficiency in C++ and large-scale data processing.A proactive approach to owning problems end-to-end, tackling various facets of complex systems.A strong passion for software engineering excellence.Preferred Qualifications:Hands-on experience with geospatial data.

Intuition Machines specializes in developing cutting-edge enterprise security solutions with a strong emphasis on AI and machine learning. Our products, like the renowned hCaptcha security suite, protect systems serving millions globally. We pride ourselves on our agile approach, characterized by low overhead, small teams, and rapid iterations.As a Senior Backend Engineer focusing on Security Automation, you will be pivotal in designing and implementing systems that automate and enhance essential processes within our Security Operations Center (SOC). Your contributions will significantly bolster our capabilities in bot detection, fraud mitigation, phishing detection, and various other security automation initiatives, enabling our team to operate efficiently and effectively on a large scale.

Join the innovative team at HelloFresh in Warsaw, where you'll be part of HelloTech, our global technology hub with over 1000 dedicated professionals. We create digital products that enhance the entire food experience for our customers, from meal kits and ready-to-eat meals to specialty items like pet food and premium meat & seafood. Our technology is at the heart of our subscription-based, direct-to-consumer model, driving personalization, pricing strategies, supply chain optimization, and sustainability efforts to minimize food waste.As part of autonomous, cross-functional teams, you'll play a pivotal role in shaping scalable, data-driven products that enhance how customers discover, order, and enjoy HelloFresh's offerings, while collaborating with international teams using a modern tech stack.

Join our dynamic team at Lingarogroup as a Backend Developer! In this role, you will be responsible for designing, implementing, and maintaining server-side applications and databases, ensuring high performance and responsiveness to requests from the front-end. You will work closely with front-end developers to integrate user-facing elements with server-side logic.We are looking for someone who possesses a strong understanding of backend technologies, is highly motivated, and thrives in a collaborative environment.

About WPP MediaWPP is a leading creative transformation company dedicated to harnessing the power of creativity to foster sustainable futures for our people, planet, clients, and communities. For more insights, visit wpp.com.WPP Media serves as WPP’s global media collective, strategically uniting the best platforms, talent, and partners to unlock endless growth opportunities in an ever-evolving media landscape. Discover more at wppmedia.com.At WPP Media, our culture and people are our greatest assets, enabling us to deliver outstanding experiences to both our clients and each other. In this role, embracing WPP and WPP Media’s core values will be essential:Be Extraordinary by Leading Collectively to Inspire Transformational Creativity.Create an Open environment by Balancing People and Client Experiences through Trust.Lead Optimistically by Championing Growth and Development to Mobilize the Enterprise.Role Summary and ImpactAs a vital member of the Global Operations Centre (GOC) in Poland, you will collaborate with teams across the United States, Europe, and Asia to deliver impactful solutions in a dynamic, multicultural environment.We are looking for a dedicated Senior Commerce Specialist to join our team, where you will be instrumental in managing and optimizing Google Ads campaigns.Key Responsibilities:Oversee search and programmatic media activations on Amazon.Engage effectively with internal PL teams and regional partners (e.g., UK, USA, EMEA), demonstrating proactive communication skills.Implement campaign setups, bid recommendations, and budget management to achieve client goals using retail bid management technologies like Pacvue.Optimize client accounts to align with their established KPIs.Ensure ongoing compliance with campaign guidelines and best practices.Generate performance reports on a weekly, monthly, and quarterly basis.Identify insights and opportunities for continuous improvement.

Join HelloFresh as a Senior Backend Engineer focused on transforming the finance technology landscape. In this pivotal role, you will develop and optimize backend systems to enhance our financial operations, ensuring efficiency and reliability across our services.

About HelloFresh and HelloTech HelloFresh’s Warsaw office is part of HelloTech, the technology group powering digital products for more than 1,000 professionals worldwide. HelloTech builds and maintains the platforms behind HelloFresh’s meal kits, ready-to-eat meals, and specialty lines like pet food and premium meats and seafood. These platforms enable personalized food experiences for millions of customers each month. How Technology Shapes Our Food Experience Technology drives every aspect of HelloFresh’s subscription, direct-to-consumer model. Teams develop customer-facing apps, personalization systems, pricing tools, forecasting models, and supply chain solutions. Many initiatives also focus on reducing food waste. While each HelloFresh brand serves its own audience, all rely on shared data, platforms, and operational standards set by HelloTech. Role Overview: Senior Backend Engineer - Menu Personalization Senior Backend Engineers at HelloFresh in Warsaw join autonomous, cross-functional teams, each focused on a specific product area or domain. Working closely with international colleagues, engineers help design and deliver scalable, data-driven products used in multiple markets. The role involves collaborating with a modern technology stack and contributing to features that shape how customers find, order, and enjoy HelloFresh’s menu options.

Teltonika Networks is seeking a Mid Backend Engineer in Warsaw, Masovian Voivodeship, Poland. The team develops backend software for networking solutions that power Industry 4.0, Smart City initiatives, and Green Energy projects. Teltonika designs and manufactures connectivity equipment for industrial and enterprise use, including routers, switches, gateways, and modems. Product details are available at https://www.teltonika-networks.com/products. Role overview This position centers on backend development for embedded Linux software used in IoT devices. The Mid Backend Engineer will contribute to API frameworks and help bring new technologies into established systems. Collaboration with R&D teams is a regular part of the role, especially when solving technical challenges. Main responsibilities Design and implement embedded Linux software for IoT hardware Develop and maintain proprietary API frameworks for R&D use Analyze and integrate new technologies into current systems Work with colleagues to resolve complex technical issues Requirements At least 2 years of experience programming in C Minimum 2 years working with APIs Proficiency in Shell and Python scripting for automation Solid understanding of Git version control Experience with Linux-based operating systems Strong written and spoken English Preferred qualifications Technical degree in a relevant field Background working with IoT devices Understanding of computer networking principles Knowledge of cybersecurity practices Experience with Lua programming Familiarity with OpenWrt Benefits Opportunities for career growth within a growing company Challenging projects in industrial networking Private medical care (Medicover Premium) and Multisport card Flexible hybrid work, coordinated in advance with your manager Extra day off for your birthday Team-building events and activities

Join Box as a Senior Software Engineer specializing in File Systems and play a pivotal role in enhancing our innovative content management platform. At Box, we empower organizations to thrive in the AI-first era by optimizing collaboration and workflow management. As part of the Content Capabilities team, you'll contribute to our ambitious goal of supporting the Box Content Cloud's exponential growth by developing new platform features that enable intuitive user experiences. Collaborate with a talented team to tackle complex challenges in content management and make a significant impact on productivity for millions of users at leading enterprises.

Elevate Your Career with Whatnot!Whatnot stands as the premier live shopping platform in North America and Europe, where buying, selling, and discovering your favorite items is redefined. We are transforming e-commerce by seamlessly integrating community, shopping, and entertainment into a unique experience designed just for you. Operating as a remote co-located team, we are driven by innovation and firmly rooted in our core values. With locations across the US, UK, Germany, Ireland, and Poland, we are collaboratively crafting the future of online marketplaces.Our live auctions cater to a diverse range of interests, from fashion and beauty to electronics and collectibles, including trading cards, comic books, and even live plants. And this is just the beginning! As one of the fastest-growing marketplaces, we are on the lookout for daring, forward-thinking problem solvers across all functions. Stay updated with the latest Whatnot news by checking our news and engineering blogs, and join us in empowering individuals to turn their passions into thriving businesses while fostering community through commerce. Role OverviewAs a pivotal leader within our Infrastructure team, you will significantly influence the evolution of Whatnot's reliability and scalability as we continue on our hypergrowth trajectory. You will oversee our Infrastructure Engineering team, tasked with creating the tools, components, and processes that empower all engineering teams at Whatnot to build and maintain reliable software solutions.The Infrastructure Engineering team's mission focuses on Service Level Objectives (SLOs), observability, load testing, resilience testing, incident response, and traffic control mechanisms. Collaborating closely with engineering teams across the organization, you will help establish reliability standards, expedite issue detection and resolution, and ensure that Whatnot's systems remain reliable, scalable, and high-performing as we expand.Responsibilities include:Lead and mentor a talented team of software engineers, fostering their technical development, execution, and long-term career progression.Develop and implement the strategic roadmap for reliability engineering at Whatnot.Establish and operationalize best practices that enable product and platform teams to design and manage reliable systems, incorporating SLOs, monitoring standards, and incident response frameworks.

Join SplitMetrics, a pioneering global software company that empowers mobile-first businesses with an innovative ecosystem of products and services designed to drive growth. Our offerings include:SplitMetrics Acquire: A powerful platform for automating and optimizing Apple Ads.SplitMetrics Agency: A comprehensive mobile marketing agency backed by industry experts.SplitMetrics Optimize: An award-winning A/B testing platform recognized as the ASO Tool of the Year.App Radar by SplitMetrics: An advanced ASO platform offering in-depth keyword and competitor analysis.Why Choose SplitMetrics? With nearly a decade of experience, we lead the mobile marketing industry with cutting-edge technologies.As an Apple Ads Partner, we were the first to develop a management platform for Apple Ads.Collaborate with top mobile brands globally, including Skyscanner, Glovo, Flo, Babbel, and Wooga.Our ecosystem supports over $1 billion in ad spend annually.Incorporated AI into our strategic initiatives since 2023.Enjoy a remote-first culture that fosters collaboration across 20+ countries.We are on the lookout for a talented Senior Backend Engineer (Python) to join our dynamic team.

Welcome to The Codest!We are an international technology software company with tech hubs in Poland, dedicated to delivering global IT solutions and projects.Our core values prioritize "Clients and People First," focusing on the needs of our clients and creating a collaborative environment for our employees, enabling us to deliver truly exceptional products and services.With a wealth of experience in web development, DevOps, and QA, our mission has evolved after many years in software development, and we now specialize in scaling tech teams for clients and partners.Project Overview:Our client is one of the largest e-commerce platforms in Europe, used daily by millions of users. The company connects sellers—from small businesses to global brands—with customers, offering a vast selection of products, rapid delivery, and a refined shopping experience.In this project, you will join a team responsible for building a new platform for planning and launching advertising campaigns across multiple channels simultaneously, utilized by some of the biggest brands in the market.We are seeking Data Engineers who will participate in creating high-performance data processes from the ground up, with a strong emphasis on low latency, scalability, and quality.Role Responsibilities:Build and develop new data pipelines in an RTB environment.Design ultra-low latency systems (millions of QPS), including latency budgeting and performance optimization.Contribute to shaping solution architecture while ensuring a balance between quality, scalability, and execution efficiency.Implement solutions using Python, SQL, and Kafka; analyze Go code in partner services; work with Scala/JVM stack (Spark/Flink).Assist in managing deployment processes and maintaining systems in a cloud environment (primarily GCP).

Join Strix as a SysOps Engineer and contribute to the development of reliable and scalable e-commerce solutions. In this role, you will be responsible for automating processes, maintaining infrastructure, and implementing new technologies in production environments. If you value quality, adhere to best SysOps practices, and seek a place where your skills make a real impact – Strix is the right choice for you!

As a Backend Engineer, you will play a crucial role in designing and implementing highly scalable, secure backend services for our innovative SaaS platform. Your primary focus will be on ensuring outstanding performance, reliability, and security throughout our systems.

Join Bolt's Customer Support Automation team as a Staff Backend Engineer specializing in AI Applications. In this pivotal role, you will design and architect the foundational AI agent infrastructure that supports our automation solutions. Leverage your expertise to create multi-agent orchestration frameworks, execution engines, and evaluation pipelines that scale our Customer Support operations. If you are enthusiastic about agentic AI, distributed systems, and building high-performance platforms, this position is tailored for you.

Flying Bisons is a premier Digital Consulting and Delivery company situated in the vibrant city of Warsaw, Poland. Our mission is to empower our clients to Unleash Digital Potential™. We excel in discovering, defining, designing, and developing top-tier digital products that yield impactful business results for our clients, creating outstanding digital experiences for millions worldwide.What sets us apart is our comprehensive end-to-end process that equips us to tackle every challenge with the assurance of achieving optimal results. Our areas of expertise encompass Research, Digital Strategy, Branding, Content Creation (Written, Photos, Videos), Product Design, Web & Mobile Development, Data Analytics, and AI.Become part of our dynamic team of 120 professionals and collaborate in crafting groundbreaking products and exhilarating experiences for notable brands(such as Mercedes AMG, IKEA, KFC, eObuwie, Żabka, Sanofi, Zain) and innovative startups (like Booksy, Nethone, Telemedi, or DevSkiller)!We are in the process of building a curated network of talented freelance Backend Developers to engage for both current and future projects. When you apply to join our freelancer base, your application will be assessed and kept on file. You may not be contacted immediately, but once a project aligns with your expertise, you will receive an invitation to participate, allowing you to accept or decline based on your availability. If you're interested in joining our talent pool, please submit your CV. We will reach out as soon as a fitting opportunity becomes available.Are you a self-motivated and reliable professional? If so, we are eager to hear from you!

Join Cloudinary, the leading platform for image and video technology that empowers some of the world’s most notable brands to deliver remarkable visual experiences on a global scale. With over 2 million users and 10,000 esteemed clients such as Apartment Therapy, Bleacher Report, Etsy, Grubhub, Mattel, Mediavine, Minted, Paul Smith, and Peloton, Cloudinary is at the forefront of transforming how brands engage with their audiences.Our powerful image and video APIs, supported by cutting-edge artificial intelligence and patented technology, provide brands with a unified platform to manage, transform, optimize, and distribute visual content efficiently.As a Senior Media Processing Backend Engineer, you will be a vital part of Cloudinary’s Image team, collaborating with both frontend and backend engineers to develop innovative features, maintain existing systems, and manage over 300 production cloud servers.The team plays a critical role in Cloudinary’s flagship product, which generates over $100 million in annual recurring revenue. This encompasses our image transformation engine and deep learning technologies, handling an impressive volume of 5 billion requests each month (approximately 2000 requests per second). We support the media needs of the largest global brands, ensuring they receive high-quality media with modular transformations, low bandwidth, and minimal latency.

Join Attio: Pioneering the Future of CRM in the AI EraAt Attio, we are on a transformative mission to revolutionize Customer Relationship Management (CRM) for the age of artificial intelligence. Our goal is to create the first AI-native CRM solution tailored for the most ambitious go-to-market teams. Recently, we secured a $52M Series B funding led by GV (Google Ventures), alongside support from Redpoint, Balderton, Point Nine, and 01A. Our passionate team is dedicated to overcoming complex technical challenges, delighting users, and setting new industry benchmarks.About the RoleOur Engineering team is focused on tackling the most challenging problems so our users can thrive. We build real-time infrastructure, AI-native architecture, and a seamless frontend experience, all powered by a team that operates swiftly, thinks critically, and maintains exceptionally high standards for quality.We are seeking a Senior Product Engineer who is passionate about pushing boundaries, meticulous about details, and eager to help reshape how millions of individuals work.

Join Saily, where we are revolutionizing mobile connectivity for travelers. Say goodbye to roaming fees and plastic SIM cards, and enjoy ultra-fast, secure mobile data across over 200 destinations. With millions of paying customers and hundreds of thousands of travelers engaging with Saily at any moment, we are dedicated to enhancing the travel experience.At Saily, we cultivate an AI-native Product Engineering culture. Here, every engineer is a builder, tasked with solving customer challenges from conception to deployment. Our AI agents handle repetitive coding tasks, empowering engineers to focus on impactful solutions. Every team member is encouraged to contribute ideas for improvement, ensuring that our focus remains on providing our customers with a seamless, connected journey.We prioritize growth over comfort, contributions over hierarchy, and impact over process. At Saily, we equip talented individuals with context, autonomy, and advanced AI tools to excel in their roles.