Staff Software Engineer (Backend/Machine Learning) - Compliance & Readiness

Waymo is a pioneering autonomous driving technology company dedicated to becoming the world's most trusted driver. Originating from the Google Self-Driving Car Project in 2009, Waymo has been committed to developing the Waymo Driver—The World's Most Experienced Driver™—to enhance mobility access and significantly reduce traffic-related fatalities. The Waymo …

Join Moss, where we empower finance professionals to automate their workflows and make strategic decisions.Our unique culture is centered around impact and growth, fostering an environment where each team member is encouraged to learn and succeed. Recognized by Sifted’s Rising 100 and LinkedIn's Top Startups, we aim to advance your career while making Moss a lasting success.Our Engineering teams are looking for talented Senior Backend Engineers (f/m/d) to join various teams in Warsaw. Open positions include:Sales EnablementPricing & BillingAcquisitionSpend ManagementActivation & Card SpendIn this role, you will collaborate closely with designers, product managers, and frontend engineers to bring innovative ideas to fruition, ensuring our product provides intuitive and efficient tools for business automation and simplification.

Join HelloFresh in Warsaw as part of our innovative HelloTech organization, which serves as HelloFresh's global technology backbone, consisting of over 1000 professionals dedicated to crafting the digital products that enhance our comprehensive food experience. Our offerings include meal kits, ready-to-eat meals, and specialty products like pet food and premium meats & seafood, all facilitated by the platforms that HelloTech builds to deliver personalized food solutions to millions every month. Our subscription-based, direct-to-consumer model is deeply reliant on technology at every touchpoint—from customer-facing applications and personalization algorithms to pricing strategies, forecasting, and supply chain optimization. Additionally, we are committed to initiatives that minimize food waste. While our brands operate independently to cater to distinct customer needs, they are unified by the shared platforms, data, and operational excellence established by HelloTech. HelloTech operates through autonomous, cross-functional alliances, each owning specific products or domains from inception to completion. By collaborating in our Warsaw office, you will contribute to the development of scalable, data-driven products utilized across our markets, utilizing a modern tech stack and working with international teams to enhance how customers discover, order, and enjoy HelloFresh’s offerings now and in the future.

Apollo.io is a premier go-to-market solution empowering revenue teams globally. With a robust user base exceeding 500,000 companies and millions of users, our platform supports everyone from burgeoning startups to industry giants. Established in 2015, Apollo.io has rapidly ascended to become one of the most dynamic players in the SaaS sector, securing around $250 million in funding and achieving a valuation of $1.6 billion. We provide sales and marketing teams with instant access to verified contact data for over 210 million B2B contacts and 35 million companies worldwide, along with a suite of tools that streamline engagement and conversion on a unified platform. By facilitating accurate contact information retrieval and automating outreach processes, Apollo.io transforms prospects into loyal customers. In 2023, we successfully raised a Series D round and are supported by esteemed investors such as Sequoia Capital and Bain Capital Ventures, with industry leaders like JD Sherman, the former President and COO of Hubspot, on our board.**This is a Permanent role ("Umowa o pracę") and not a B2B contract** YOUR ROLE & MISSION As a Senior Backend Software Engineer at Apollo.io, you will play an essential role within our expanding team. Collaborating with cross-functional teams, you will implement best practices in technology, architecture, and processes. This position offers you the opportunity to thrive in an open and collaborative environment, where mentorship flows both ways, enabling you to grow and accelerate your career. Your passion for learning and teaching will be invaluable as you engage with design, front-end, analytics, and various teams beyond Engineering. You will relish solving complex problems collaboratively and making a tangible impact. At Apollo, you will be driven by a commitment to quality, relentlessly pursuing improvements in quality, automation, and bug resolution while investigating performance enhancements and innovative ideas.

Role Overview oscilar is hiring a Senior Backend Engineer with a focus on Java. This remote position is open to candidates based in Poland. The role centers on building and maintaining backend systems that support oscilar’s products and services. What You Will Do Work closely with teams across disciplines to design, implement, and support backend applications Develop scalable, reliable backend systems using Java Contribute to the ongoing improvement of code quality and system performance Location This is a remote role available to candidates located in Poland.

QA Engineer(osoba na stanowisku QA Engineera)Wynagrodzenie:B2B 10 000- 14 000 netto+ VATUOP 8 300 - 11 620 bruttoO roliDołącz do naszego zespołu jako QA Engineer, gdzie jakość to fundament naszych produktów e-commerce. Będziesz współpracować z utalentowanym zespołem w Polsce oraz klientem, mając realny wpływ na rozwój nowoczesnych rozwiązań.Twoje obowiązki obejmują wspieranie jakości na każdym etapie projektu, począwszy od usprawniania procesów, przez identyfikację ryzyk, aż po wdrażanie narzędzi automatyzacji w różnych zespołach.Pracując z doświadczonym zespołem, będziesz uczestniczyć w projektach od ich początkowej koncepcji po ostateczne wdrożenie, a Twoje decyzje będą miały wpływ na końcowy efekt.Technologie i narzędzia:DevToolsPostman / SoapUI (lub porównywalne narzędzia)BrowserStack (lub iOS Simulator, SauceLabs, Lambda Test)GitNew Relic, Track.jsDBeaverNarzędzia do pomiaru i optymalizacji wydajności (Google PageSpeed Insights, GTMetrics)

Are you passionate about building high-performance backend systems? Join Affirm as a Senior Backend Software Engineer, where you will play a critical role in developing our Merchant Data Platform for the EU market. In this remote position, you will work with a talented team to design, implement, and maintain scalable solutions that enhance the experience for our merchants.

Join our team as a Backend Engineer and contribute to our innovative solutions at NordProtect. We are looking for talented individuals with a passion for technology and a strong background in backend development, specifically using Go. In this role, you will collaborate with cross-functional teams to design, implement, and maintain robust and scalable backend systems.

Join Moss, where we empower finance professionals to automate their daily tasks and make strategic decisions.Our unique culture is driven by impact and growth, with every team member dedicated to learning and excelling. Recognized by Sifted’s Rising 100 and LinkedIn's Top Startups, we are committed to propelling your career and achieving lasting success together.We are looking for talented **Mid-Level Backend Engineers (f/m/d)** to join various teams in our Warsaw office, including:Sales EnablementPricing & BillingAcquisitionSpend ManagementActivation & Card SpendIn this role, you will collaborate closely with designers, product managers, and frontend engineers to bring innovative ideas to life. Your goal will be to ensure that our product simplifies and automates everyday tasks through intuitive and efficient tools.

Point Wild creates tools to help people protect their identities and personal data. Supported by investors including WndrCo, Warburg Pincus, and General Catalyst, the team develops cybersecurity solutions for both individuals and organizations. The company’s goal is to be a trusted resource for digital safety now and in the future. Role overview This Senior Backend Engineer position is fully remote within Poland. The role joins a small, technical team focused on security projects that involve cryptography, automation, and AI-powered analysis. Day-to-day work includes hands-on software development, collaborating with senior engineers, and contributing across the technology stack. Interaction with product managers and designers is part of the workflow. What you will do Design, build, and ship features for Point Wild’s cybersecurity product suite. Write backend code that is clean and maintainable, with deployments on AWS or GCP. Work alongside experts in AI and cryptography to strengthen security features. Collaborate with product managers to understand requirements and help plan architecture, data flows, API specifications, and testing strategies. Follow established engineering practices and contribute to discussions on process improvements and code quality. Support customer-driven development by iterating based on user feedback. Create and maintain automated tests for load, performance, and error scenarios.

Join our innovative team at Nordsec as a Mid-Senior Backend Engineer specializing in Go. In this role, you will be responsible for designing and implementing robust backend solutions that drive our platform's performance and scalability. Collaborate with cross-functional teams to enhance our technology stack and deliver high-quality software solutions. Your expertise will contribute to our mission of providing secure and efficient digital services.

We are seeking an experienced Senior Backend Engineer to become a vital member of our dynamic, cross-functional product teams. This role demands extensive technical expertise, exceptional communication abilities, and a proactive, collaborative approach. The successful candidate will be deeply involved in ongoing client projects and seamlessly integrated into our established workflows.

Hello We are Bïrch, a transformative platform designed for creative and growth marketing teams, encompassing content creation, collaboration, and ad campaigns all in one powerful toolbox. With over 9 years in the business, we proudly serve more than 800 companies and 5,500 marketers. Our platform has facilitated billions in ad spend, positioning us as one of Meta's fastest-growing partners, officially endorsed by both Meta and Google. Following our rebranding from Revealbot to Bïrch, we have documented our transformative journey here.As we transition from a single successful product to a multi-product platform, we launched Bïrch Hub last year in collaboration with Meta, a user-friendly server-side tracking tool for ads. To support our ongoing growth, we are expanding our backend team. In this position, you will not only maintain existing systems but also play a pivotal role in developing new products and services, shaping architecture collaboratively, and making significant technical decisions by writing high-quality code across our dual-language backend using Ruby on Rails and Go. About UsWe are a remote-first team of friends scattered across the globe, with our headquarters located in Barcelona. Having already established a successful product, we are now embarking on a broader vision. We hire talent worldwide and cherish our offline meetups: in the last two years, we gathered in Barcelona, and previously, in Istanbul. Check out our team’s Instagram to learn more about our diverse cultures and backgrounds.

About Our Team At SumUp, we provide a comprehensive Point-of-Sale (POS) solution designed to empower businesses such as cafes, shops, bars, and salons to streamline operations and foster growth. Our platform encompasses a variety of features including product catalogs, inventory management, business analytics, compliance assistance, and loyalty programs. The Fiscalization team is dedicated to ensuring compliance in countries like Italy, Sweden, Norway, Belgium, and Austria, among others. We are also pioneering the integration with third-party services for fiscalizing receipts. As a Senior Backend Engineer, you will work alongside a vibrant, cross-functional team comprising Product Managers, Designers, Engineering Managers, and fellow engineers. Your Role In this position, you will develop secure backend systems that ensure SumUp's POS products are compliant across various countries on our roadmap. You will collaborate with the Fiscalization squad to devise unique solutions tailored to the challenges in each market. We are looking for a developer who values user-centric design, precision, and seamless collaboration. You will excel in a structured communication environment and thrive in a cross-functional team. This is a B2B role based in Warsaw. Key Responsibilities Design and maintain fiscal compliance solutions to support SumUp's expansion across Italy, Sweden, Norway, Belgium, Austria, and other European markets. Develop integrations with third-party services for receipt fiscalization and regulatory reporting. Navigate SumUp's intricate POS ecosystem and familiarize yourself with fiscalization frameworks across multiple jurisdictions. Work collaboratively with team members and stakeholders distributed across 5+ cities in a hybrid working model. You Will Succeed in This Role If You Have: 5+ years of experience in backend engineering with expertise in Java and/or Kotlin. A solid understanding of system architecture, design principles, data modeling, and API development. Hands-on experience with distributed and fault-tolerant systems. Proficiency in AWS and Kubernetes. Strong knowledge of Kafka, PostgreSQL, and CQRS.

Innovecs provides digital services to clients across the US, UK, EU, Israel, Australia, and Ukraine. The company develops software for industries including supply chain, healthtech, collaboration technology, and gaming. Solutions are designed to meet each client’s changing business requirements. Innovecs has earned recognition for its growth and workplace culture. The company appeared on the Inc. 5000 list of fastest-growing private US companies for five consecutive years and is ranked among the top global outsourcing providers by IAOP. Additional honors include the Global Good Awards for Employee Engagement & Wellbeing, a gold award at the Employer Brand Management Awards, and a place in the Global Top 100 Inspiring Workplaces Ranking.

Join HelloFresh in Warsaw as part of the HelloTech organization, our global technology backbone comprising over 1,000 professionals dedicated to developing digital products that enhance our comprehensive food experience. From meal kits and ready-to-eat meals to specialized offerings such as pet food and premium meat & seafood, HelloTech builds the platforms that deliver personalized food solutions to millions of customers each month. Our subscription-based, direct-to-consumer model leverages technology at every touchpoint—from customer-facing applications and personalization algorithms to pricing, forecasting, supply chain optimization, and initiatives aimed at minimizing food waste. Though our brands function independently to cater to unique customer needs, they are unified by shared platforms, data, and operational excellence fostered by HelloTech.At HelloTech, we operate in autonomous, cross-functional teams, each responsible for a specific product or domain from inception to completion. In collaboration with our Warsaw office, you will contribute to the development of scalable, data-driven products utilized across various markets, employing a modern tech stack and working alongside international teams to continually enhance how people discover, order, and enjoy HelloFresh’s offerings, both now and into the future.

Join NordPass and revolutionize password security.At NordPass, we are committed to making logins safer and more straightforward for everyone. As a member of our dedicated team, you will contribute to developing a password manager that is trusted by over 7 million users and more than 10,000 organizations worldwide to protect their credentials, payment information, and sensitive data.Your Role: Play a vital role in helping millions secure their digital identities by designing smarter, safer login solutions.

Senior Software Engineer, Data Foundations ABOUT THE ROLE At Peloton, we view Data as a Product—a vital asset that drives every member interaction and influences business decisions. Our Datastores team is committed to offering a dependable, secure, and high-performing data persistence layer for application services throughout the organization. Our core principles include: 1. Safeguard the data, 2. Optimize for scalability, speed, and reliability, and 3. Minimize manual effort. We are seeking a Senior Software Engineer with extensive experience in constructing and managing data-intensive systems to join our Datastores team. This position is perfect for a backend engineer who has developed and maintained production systems heavily reliant on databases, caching layers, and data pipelines, and who is eager to advance their knowledge in scalable, cloud-native data infrastructures. You will collaborate at the intersection of application engineering and data platform reliability, working alongside service teams to enhance the storage, access, scalability, and observability of data across Peloton’s ecosystem. YOUR DAILY IMPACT AT PELOTON Your responsibilities will include: Designing, building, and maintaining backend systems that depend on scalable and highly available data persistence layers. Collaborating with service teams to refine database design, enhance query performance, and optimize data modeling. Contributing to automation efforts surrounding infrastructure provisioning using tools like Terraform and Backstage, while improving developer experience by creating self-service tools for databases and caching systems. Focusing on observability, performance insights, and autoscaling strategies for production datastores. Participating in architectural discussions regarding multi-regional data persistence and global scalability. This role merges hands-on backend engineering with significant exposure to cloud data systems and platform reliability challenges. WHAT YOU BRING We are looking for proficient backend engineers who are data-centric—those who have built systems where data performance, reliability, and modeling are crucial. 5+ years of software engineering experience in developing production backend systems. Strong familiarity with relational databases such as PostgreSQL or MySQL, including schema design, indexing, and query optimization. Experience with NoSQL datastores like DynamoDB, Redis, Elasticsearch, or Memcache. Exposure to data pipelines, event-driven architectures, and cloud technologies.

Join the NordPass Team to Revolutionize Password Security!At NordPass, we strive to make online password management effortless and secure. With over 7 million users and 10,000+ companies relying on us, we are committed to providing a premium password manager that safeguards credentials, cards, and sensitive information.Your Contribution: Play a pivotal role in enhancing digital security for millions by developing innovative and secure login solutions.Key ResponsibilitiesCollaborate with cross-functional teams to integrate and optimize microservices across NordSecurity's product ecosystem, ensuring a seamless user experience.Prioritize the delivery of high-quality, scalable, and secure code.Engage in key technical and architectural decisions, refining development processes and shaping the strategic direction of our products.Demonstrate strong ownership over product development, maintenance, and quality assurance.Facilitate effective communication and collaboration among engineering, product, and design teams.Essential QualificationsExtensive experience with PHP (3+ years).Hands-on experience with AI tools to enhance engineering (e.g., code generation, test creation, performance optimization, and debugging), demonstrating accountability for outcomes.Proficient in system design, with a clear understanding of design patterns and their applications.Solid grasp of Object-Oriented Programming (OOP), asynchronous programming, and design patterns.A genuine passion for architecture and technology; we want to hear from those who can create scalable and robust code.Familiarity with core CI/CD principles, unit testing, and integration testing.Preferred QualificationsKnowledge of cryptography.

Join LoopMe, the premier in-app monetization and programmatic advertising platform. With a reach of over 900 million unique monthly users and the processing of more than 200 billion ad requests, our platform offers unparalleled opportunities for mobile app developers. The Chartboost SDK is recognized as the most-integrated independent mobile ad SDK, facilitating meaningful connections between advertisers and highly engaged audiences.What We Are Looking ForWe seek an experienced backend software engineer to become an integral part of our exchange team. Your mission will be to enhance our advertising platform, designed to handle hundreds of thousands of requests per second while conducting real-time auctions to deliver optimal ads from our global partners. We empower our engineers to take ownership of this vital system, overseeing the complete lifecycle of feature development—from initial design to production deployment.Our primary system is developed in functional Scala, providing opportunities to leverage your distributed, low-latency programming skills using modern technologies like MongoDB, protocol buffers, and more. As we transition from Scala to Java in the coming years, your expertise will be invaluable in guiding this change.Your ResponsibilitiesDesign, implement, and test functionalities for our Exchange product.Assist in the migration of our advertising exchange from Scala to Java.Collaborate effectively with engineers, system architects, and Operations teams to implement enhancements and resolve issues.Engage in technical discussions, proposing innovative solutions to enhance the product and processes.Troubleshoot application, technology, and infrastructure issues.Continuously expand your technical knowledge.Demonstrate creativity and independence while collaborating to maximize efficiency and throughput.Consistently deliver high-quality work on time and enhance developer productivity across the organization.Value clean code and possess experience in writing unit tests to maintain superior code quality.Your QualificationsBachelor’s degree in Computer Science or a related field.1+ years of Scala programming experience.2+ years of Java programming experience.6+ years of overall software engineering experience.Understanding of microservices with practical implementation experience.Experience in developing high-capacity, high-traffic, high-availability systems.Familiarity with Agile development methodologies.Preferred QualificationsExperience in advertising technology.Familiarity with Python or Java.Experience with NoSQL databases.