Principal Software Engineer (Ruby Specialist)

Join a Transformative CompanyAt Palantir, we are dedicated to developing innovative software that tackles some of the world's most pressing challenges. We collaborate with major institutions globally to revolutionize their data and technology utilization. Our solutions have been instrumental in preventing terrorist activities, advancing medical research, enhancing financial market strategies, and much more. If you're passionate about impactful projects, we invite you to become part of our team.Your RoleAs a Forward Deployed Software Engineer (FDSE), you will engage directly with clients to swiftly assess their most critical issues and devise data-driven solutions. Our clients depend on Palantir’s platforms for essential operations, often beginning with probing questions like “What causes our flight delays?” or “How can we improve money laundering detection?” In this role, you will leverage your analytical prowess, creativity, and technical expertise to empower organizations to harness their data for significant global impact. You will gain unparalleled insights and contribute to vital industries and institutions.Your responsibilities will parallel those of a startup CTO, working in agile teams with minimal oversight while taking full ownership of high-stakes projects. Your daily tasks may include architectural discussions with engineers, managing vast datasets, developing custom web applications, liaising with client executives, or strategizing with your team.Whether your aspirations lie in entrepreneurship or engineering leadership, Palantir offers an unparalleled environment — with exceptional colleagues — to cultivate your skills. You will learn to dissect complex problems, evaluate the implications of solutions, explore new technologies and programming languages, and even contribute to their development. You will operate independently while being supported by a community that encourages your growth and challenges you to excel.Our Core Values• Impact: Engage in significant and challenging projects that drive positive change.• Ownership: See projects through from conception to completion, overcoming any challenges along the way.• Collaboration: Work closely with diverse teams, including fellow FDSEs, product teams, and Deployment Strategists, as well as with clients on-site to address their needs.• Trust: We empower each other to manage our time and priorities effectively, allowing for independent thought and decision-making.• Growth: We motivate ourselves and colleagues to pursue new challenges and opportunities for personal and professional development.

Waymo is revolutionizing the future of transportation with our cutting-edge autonomous driving technology. As a pioneer in this field, we aspire to be the world's most trusted driver. Originating from the Google Self-Driving Car Project in 2009, we have dedicated ourselves to developing the Waymo Driver—The World’s Most Experienced Driver™—which enhances mobility access while aiming to prevent the tragic loss of lives due to traffic accidents. Having completed over ten million rider-only trips and driven autonomously for more than 100 million miles on public roads, we are ready to take the next step in our journey.Join our dynamic Waymo Commercialization team and play a crucial role in shaping the future of transportation! We are seeking an enthusiastic Staff Software Engineer who is eager to contribute to the evolution of our core ride-hailing and fleet management systems.In this hybrid role, you will engage in cross-disciplinary collaboration, working alongside technical teams (mobile applications, cloud backends, and the Waymo Driver) and functional departments (operations, product, legal, partnerships, policy, and privacy) to develop and implement vital infrastructure for our business.

As a Software Validation Engineer III at Collabera, you will play a critical role in ensuring the quality and reliability of our software solutions. You will be responsible for developing and implementing validation strategies, conducting thorough testing, and collaborating with cross-functional teams to enhance product performance. Your expertise will contribute to continuous improvement initiatives and compliance with industry standards.

Join our dynamic team at evooq as a Senior Software Engineer! In this role, you will leverage your extensive experience in software development to design, implement, and maintain high-quality software solutions that meet our client’s needs. You will collaborate closely with cross-functional teams, contributing to all stages of the development lifecycle. If you are passionate about technology and eager to make a significant impact, we want to hear from you!

Role overview SmartRecruiters is seeking a Senior Software Engineer with strong Python skills to join the team in Poland. This role focuses on building and enhancing scalable software that supports the company’s product suite. Senior engineers at SmartRecruiters play a key part in shaping technical decisions and work closely with colleagues from various teams. What you will do Design and implement software solutions using Python Work with product managers, designers, and engineers to deliver new features Promote development best practices and contribute to architectural choices Mentor junior engineers and help them grow technically Requirements Experience building scalable applications with Python Comfort working in a collaborative setting that can move quickly Interest in solving practical problems with technology Ability to share knowledge and support less experienced team members

About the RoleJoin Logz.io as a Backend Software Engineer and be part of a dynamic team that is reshaping the observability landscape. In this role, you will design and develop robust backend systems that scale effectively, ensuring seamless integration and exceptional performance.Key ResponsibilitiesDevelop and maintain scalable backend services and APIs.Collaborate with cross-functional teams to define, design, and ship new features.Troubleshoot and optimize existing systems for performance and scalability.Participate in code reviews and contribute to team knowledge sharing.

As a Senior Software Engineer focusing on AI Retrieval at Asana, you will play a pivotal role in designing and implementing cutting-edge solutions that enhance our AI capabilities. You will collaborate with cross-functional teams to build scalable systems that improve information retrieval and user experience. Your expertise in software engineering and artificial intelligence will help drive innovation and set new standards for efficiency and performance.

About the Role nearmap is hiring a Software Engineer in Warsaw. This team focuses on developing solutions for aerial imagery, working together to solve technical challenges and improve products. What to Expect Contribute to projects that advance aerial imagery technology Work closely with colleagues in a collaborative setting Engage with complex problems and help build practical solutions Who We’re Looking For Experience in software engineering Comfort working as part of a team Interest in tackling technical challenges This position is based in Warsaw.

About Us:RTB House stands as a pioneering performance demand-side platform (DSP), harnessing proprietary Deep Learning AI algorithms to empower brands in their growth journeys. As a market leader, we drive performance through Deep Learning across the entire purchase funnel.Established in 2012 and currently operating in over 90 markets, RTB House is firmly private-by-design, advocating for first-party advertising and a relentless commitment to innovation. Our end-to-end Deep Learning-powered AdTech products and solutions are tailored to maximize conversions, facilitate new customer acquisition, enhance engagement, and stimulate long-term demand for our global clientele.We are on the lookout for a talented Software Engineer with substantial backend and microservices development experience to join our dynamic team. In this role, you will design, develop, and maintain web applications, microservices, and internal tools, while also contributing to frontend development as necessary.

Location: PolandAbout Us:RTB House is a leading global technology company that specializes in cutting-edge marketing solutions for renowned brands and agencies across the globe. Our proprietary ad-buying engine, the first of its kind, utilizes Deep Learning algorithms to provide advertisers with exceptional results and to effectively meet their objectives at every stage of the marketing funnel.We invite you to join RTB House as the head of our AI Engineering Lab, a team dedicated to driving innovation through the latest advancements in Agentic AI. This position is designed for a proactive engineer and technical leader committed to architecting, developing, and deploying next-generation AI solutions that enhance engineering productivity.

About Aurora Solar Aurora Solar builds software that helps solar professionals design, sell, and install solar projects for both residential and commercial customers. Our platform supports millions of solar projects worldwide, providing tools and insights that make solar energy more accessible. Aurora Solar has received recognition as one of the "Best Remote Companies To Work for in 2025" by BuiltIn.com and is a Certified Green Business (CGB) by the city of San Francisco for the second year in a row. Team Overview The International team drives Aurora Solar’s expansion into new markets. Engineers on this team create solutions that address local compliance needs and adapt workflows for different regions. Collaboration with stakeholders from various countries helps the team understand local solar sales, design, and installation practices. The group values knowledge sharing, inclusivity, and continuous improvement, celebrating progress whether it’s a new feature launch or a more resilient system. Role Overview The International Software Engineer will help strengthen Aurora Solar’s platform as the company grows globally. This role focuses on building scalable systems that support new initiatives and enhance the experience for both solar professionals and homeowners. The position offers opportunities to take on increasing responsibility and contribute to smarter, simpler solutions for the clean energy transition. This is a hybrid role based in Warsaw, Poland.

Are you passionate about leading a team while writing high-quality code? Join Sigma Software as a Senior Software Engineer / Team Leader! In this pivotal role, you will guide a talented team of engineers, overseeing code reviews, design critiques, and career development while collaborating with our integration teams.Design and develop scalable solutions, ensuring a balance between production-ready code and rapid proof-of-concept development.Take ownership of sprint planning and execute the quarterly roadmap effectively.Serve as the final escalation point for complex technical challenges.Quickly learn and adopt new technologies while strategically managing technical debt.

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.

Waymo is pioneering the future of mobility with its cutting-edge autonomous driving technology. Established in 2009 as the Google Self-Driving Car Project, our mission is to become the world’s most trusted driver. Our flagship product, the Waymo Driver—The World’s Most Experienced Driver™—aims to revolutionize access to transportation while drastically reducing road traffic fatalities. The Waymo Driver powers our fully autonomous ride-hailing service and is compatible with various vehicle platforms and applications. With over ten million rider-only trips completed and vast experience from driving over 100 million miles on public roads and extensive simulations across more than 15 U.S. states, we are leading the way in safety and efficiency.The RO Performance team plays a pivotal role in enhancing Waymo's self-driving technology. We are responsible for developing and maintaining the crucial infrastructure needed to process and analyze vast amounts of data from real-world driving logs and simulations.Our systems create essential metrics and dashboards that are vital for monitoring product performance, pinpointing areas for enhancement, and facilitating data-driven decision-making. The insights generated by our team directly impact Waymo's operational strategies, weekly performance evaluations, and, ultimately, the safety and reliability of our autonomous vehicles.In this hybrid role, you will report directly to a Staff Software Engineer.

Join our dynamic team at Sigma Software Group as a Senior Software Engineer / Team Leader, where you'll play a pivotal role in leading innovative projects and guiding a skilled team of developers. You will be responsible for architecting robust software solutions, ensuring high-quality code, and mentoring junior developers.We are looking for a passionate leader who thrives in a collaborative environment and is eager to take on challenges. If you have a strong background in software engineering and a desire to lead a team towards success, we want to hear from you!

Join Hostinger as a Backend Software Engineer specializing in Node.js in a fully remote position! In this role, you will be responsible for developing high-performance backend solutions that support our web applications and services. Collaborate with a dynamic team of developers and contribute to exciting projects that empower our users around the globe.

Join Nearmap as a Lead Senior Software Engineer on our dynamic API team, where you will spearhead the design, implementation, and delivery of innovative software solutions that align with our business goals. Your expertise will empower our developers to tackle real-world challenges faced by our users.In this pivotal role, you will collaborate closely with the Product team to analyze requirements, design robust software solutions, and elevate the capabilities of the development team through best practices and mentorship. You will have the unique opportunity to contribute to a powerful platform that manages petabytes of aerial imagery, fuels sophisticated AI models, and provides real-time geospatial insights to clients worldwide. Our systems are designed for high performance, scalability, and cutting-edge innovation, managing everything from data ingestion to API delivery and customer applications.This is a rare chance to influence quality practices across an extensive platform integrating high-resolution imagery, AI-driven insights, and scalable data delivery systems while establishing API initiatives in our new Warsaw engineering hub. Your contributions will be instrumental in ensuring the reliability of systems that are transforming decision-making processes across various industries.At Nearmap, we value versatile engineers who possess leadership skills and enthusiasm for overcoming new challenges across the full technology stack as we continue to advance our capabilities.

Join our dynamic team as a Middle Embedded Software Engineer at Sigma Software Group in Warsaw! We are looking for a passionate engineer who is eager to contribute to innovative projects in embedded systems development. You will work in a collaborative environment, leveraging your skills to create high-quality software solutions.

Join us at capital, a premier trading platform expanding globally. Our award-winning products, recognized for their advanced technology and exceptional client experience, set the standard in the industry. We are on the lookout for top-tier talent to join our dynamic engineering team.We are currently enhancing our Backend Team and seeking passionate Java Software Engineers with a keen interest in trading! Our engineering team is crucial in maintaining the performance, security, and reliability of our products. With a focus on delivering superior performance, ensuring compliance, and protecting client data, your contributions will significantly enhance the trading experience for our clients.We value engineers who not only write exceptional code but also embody our core values. We are searching for individuals who are ready to move quickly, willing to innovate and develop, who understand the importance of listening, respecting, and supporting, strive to exceed client expectations, and take full ownership for achieving real impact.