Principal Software Engineer (Ruby Specialist)

Join our dynamic team at Sigma Software Group as a Principal Software Engineer specializing in Ruby. In this role, you will lead innovative projects, drive technical excellence, and mentor junior developers. Your expertise will be pivotal in shaping our software solutions and enhancing our development practices.

Fraud Alert: We advise applicants to only submit applications through the official Sensor Tower website or designated job postings on trustworthy platforms like LinkedIn, Indeed, BuiltIn, or Hackajob. Sensor Tower will never request payment, credit card, or bank account details during the job application process. All communications will originate from email addresses ending with sensortower.com. Interviews will be conducted via phone or Zoom, and we will not use alternative email addresses or text messaging for communication. Please report any suspicious activity that does not align with these guidelines. Kindly include your resume when applying.Attention Recruitment Agencies: Sensor Tower does not accept unsolicited resumes. Please refrain from sending resumes to our job alias, employees, or any other location. Sensor Tower will not be liable for any fees associated with unsolicited submissions.About the Role:As a Back End Engineer at Sensor Tower, you will play a crucial role in scaling our database operations while managing extensive data volumes (in the tens of terabytes). We seek engineers who can creatively gather and analyze meaningful data insights.In our flat organizational structure, your contributions will significantly influence the development of products and features that support our users effectively.A Day in the Life:Interviewee: Engineering Team Lead - Sasha YelkovenkaWhat does your daily routine involve as a Software Engineer?I handle vast amounts of data, which continues to grow. My main responsibility is ensuring our customers can access this data swiftly and providing them with user-friendly tools for data consumption. I appreciate the ownership culture we have regarding our work and products.How do you collaborate with your team as a remote employee?At Sensor Tower, we foster a strong sense of community within our distributed team. We frequently collaborate over Zoom to combine our expertise and achieve outstanding results.

Role Overview Sigma Software Group is seeking a Lead Principal Software Engineer with a focus on Interior Design software. This position is based in Warsaw. The role centers on leading software development efforts that improve both the user experience and the core functionality of interior design applications. What You Will Do Guide and oversee software projects aimed at enhancing interior design tools. Collaborate with cross-functional teams to define technical requirements and deliver high-quality solutions. Ensure development meets rigorous quality standards throughout the project lifecycle. Mentor junior engineers and encourage adoption of best practices within the team. Shape the technological direction of projects, influencing how designers interact with and benefit from Sigma Software Group’s products. Impact Your leadership will help designers create visually impressive and efficient spaces. The solutions developed will support both ease of use and strong functionality for end users.

AECOM Enterprise Capabilities is currently in search of a highly skilled Principal Engineer specializing in HV Substations Primary to join our dynamic team in Poland.The role encompasses the preparation of innovative designs and deliverables associated with primary electrical systems for transmission and distribution projects. Responsibilities will include, but are not limited to:Designing primary substation systems, including AIS/GIS configurations, transformer installations, circuit breaker selection, busbar arrangements, switchgear layouts, and disconnectors for voltages up to 800kV.Creating single-line diagrams (SLDs), general arrangement (GA) layouts, equipment sizing, and layout plans for substations and transmission systems.Conducting short-circuit force calculations, busbar sizing, fault current analysis, and designing equipment protection to ensure system stability and safety.Designing earthing systems, including grounding layouts, ground grid systems, and lightning protection mechanisms for substations.Integrating HVDC and HVAC systems, including converter stations, ensuring seamless compatibility with the overall substation design.Developing transformer layouts, encompassing oil containment, busduct routing, and secondary system interfaces.Optimizing substation layouts for both new and upgraded facilities, considering constraints such as space, equipment accessibility, and construction requirements.Reviewing and enhancing control and protection systems for primary substations, ensuring alignment with secondary systems and compliance with grid operator regulations.Collaborating with civil teams to design and integrate foundations, steel structures, and electrical cable routes for full integration with primary systems.Producing equipment specification documents, bill of materials (BOM), and providing procurement support to ensure appropriate equipment selection based on project criteria.Preparing electrical interconnection diagrams, termination diagrams, cable schedules, and other documentation essential for the installation and operation of primary systems.Conducting detailed design and review of auxiliary systems, such as cooling systems, auxiliary power supplies, and battery systems for substations.Designing underground cable systems, including cable sizing, routing, and integration into existing networks, particularly for HV cables.Coordinating with external vendors and contractors to guarantee that the supply and installation of equipment align with design specifications and project needs.

About WPP Media WPP is the creative transformation company, harnessing the power of creativity to shape better futures for our people, our planet, clients, and communities. For more details, visit wpp.com. WPP Media serves as WPP’s global media collective. In an era where media permeates every aspect of life, we unite the best platforms, talented individuals, and strategic partners to unlock limitless growth opportunities. Learn more at wppmedia.com. At WPP Media, we are passionate about our culture and the people who drive it. Our values empower us to provide extraordinary experiences for our clients and one another. In this role, embracing the foundational values of WPP and WPP Media is essential: Be Extraordinary by Leading Collectively to Inspire Transformational Creativity. Create an Open environment by Balancing People and Client Experiences through Cultivating Trust. Lead Optimistically by Championing Growth and Development to Mobilize the Enterprise. Role Summary and Impact As a vital member of the Global Operations Centre (GOC), you will collaborate with teams across the United States, Europe, and Asia to deliver impactful solutions in a diverse, multicultural setting. We are in search of an exceptional and visionary Principal Engineer to join our Data & Technology Solutions leadership team. This pivotal position requires deep technical expertise, strategic architectural insight, and influential leadership. You will define the technical vision and direction for the core components of our data products and AI platforms, including WPP Open, ensuring their scalability, reliability, and innovation within the dynamic AdTech landscape. Additionally, you will mentor senior engineers, promote best practices, and significantly influence our engineering culture and future.

Join AECOM's Enterprise Capabilities as a Principal Engineer specializing in HV Substations Secondary in Poland!As a key member of our team, you will be responsible for creating and delivering designs for secondary electrical systems within transmission and distribution projects. Your duties will include, but are not limited to:Designing protection and control systems, which encompass relay settings, protection schemes, and interlock systems for substations.Preparing single line diagrams (SLDs), protection logic diagrams, metering layouts, and cable termination diagrams.Creating electrical interconnection diagrams, termination diagrams, cable schedules, and other essential documentation for the effective installation and operation of secondary systems.Conducting relay coordination studies (overcurrent, earth fault, motor protection, distance protection) including relay setting calculations and fault analysis.Performing power system studies, such as load flow analysis, short circuit studies, transient stability analysis, motor starting studies, and arc flash studies.Developing control and relay panel layouts, including general arrangement (GA) drawings, functional block diagrams, and bill of materials (BOMs).Designing SCADA communication schemes and ensuring system integration for protection systems to facilitate seamless interfacing between control and field devices.Reviewing and verifying design documentation to guarantee compliance with industry standards (IEC, IEEE) and utility specifications.Providing support during commissioning and testing phases, including Factory Acceptance Testing (FAT) and site integration of secondary systems.Creating algorithms to enhance system functionality, including fault detection, relay coordination, and stability improvement.Coordinating across disciplines, collaborating with other engineering teams to ensure the integration of secondary systems with primary infrastructure.Preparing external connection tables, cable schedules, and other design documentation as dictated by project specifications.

Role Overview JetBrains s.r.o. creates tools that help developers work smarter. The team is looking for a Software Engineer with experience in CLion, embedded debugging, and tool integrations. This position is open in several locations: Belgrade, Berlin, Limassol, Madrid, Munich, Paphos, and Warsaw. What You Will Do Design and enhance features in CLion focused on embedded systems. Debug and optimize embedded applications for reliability and performance. Integrate different development tools to improve workflow efficiency. Work with teams across disciplines to define needs and deliver solutions. Who We’re Looking For This role suits engineers who enjoy solving complex problems and improving developer tools. Curiosity, creativity, and a strong interest in technology are valued here.

Role Overview Sigma Software Group is hiring a Principal Full-Stack Engineer with strong frontend skills to join the team in Warsaw. This position centers on designing and building web applications that prioritize user experience. Collaboration with cross-functional colleagues is a key part of the work, ensuring software solutions align with client needs. What You Will Do Design and implement web applications with a focus on frontend quality and usability Work closely with teams across disciplines to deliver reliable, high-quality software Lead technical projects and set direction for development efforts Mentor junior engineers and help shape team best practices What We Look For Extensive experience in both frontend and backend development Strong background in leading projects and guiding teams Proven ability to mentor and support junior developers Commitment to building software with a user-centric approach This role is based in Warsaw and offers the chance to make a real impact on client projects and team growth.

Are you passionate about software quality assurance and eager to kickstart your career in technology? Join us as a Junior Test Specialist / QA Engineer at Netcompany1 in Warsaw!In this role, you will be a key player in ensuring the quality and performance of our software products. You will collaborate with our development teams to identify issues and implement solutions, gaining hands-on experience in testing methodologies.

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 the forefront of digital security with the world's most advanced VPN.As a passionate innovator and problem-solver, become part of the team that developed Threat Protection Pro and the NordLynx protocol—the fastest VPN globally. Our tools empower individuals by reclaiming their privacy, security, and control over their digital lives.Your Contributions: Play a pivotal role in helping millions regain authority over their online security, privacy, and data.Key Responsibilities:Design, develop, and sustain data curation and ingestion services tailored for the Threat Intelligence team.Collaborate on and implement robust architectural solutions, including distributed computing pipelines, microservices, and database integrations.Engage actively in code reviews, provide constructive feedback, and ensure top-notch technical documentation.Innovate and design new services to enhance data feed quality.Maintain adherence to coding standards, ensuring code is maintainable, readable, and secure, while fostering a results-oriented mindset.Continuously generate and discuss new ideas in the context of product development and cybersecurity.Offer technical guidance and leadership to team members.Essential Qualifications:Proficient in Python, with a strong grasp of core concepts, syntax, and data structures.Experience in designing microservice architectures and facilitating effective communication.Familiarity with data storage solutions, especially PostgreSQL.Ability to write clean, maintainable, and efficient code.Hands-on experience with cloud infrastructure technologies such as Docker and Kubernetes.Exceptional problem-solving skills with a knack for analyzing and resolving complex issues.Demonstrated capacity for rapid learning and proactive problem detection.Detail-oriented with a structured approach to research and implementation.

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!

Join Asana, where our rapid growth presents exciting challenges in ensuring that our systems remain fast, reliable, and resilient. As we evolve our product, we are making a significant investment in reliability, and establishing a brand new Site Reliability Engineering (SRE) team in Warsaw is a crucial component of this strategy. This is a unique opportunity for you to help shape our SRE practice from the very beginning. This role transcends traditional operations; we seek skilled software engineers who are passionate about developing reliable, distributed systems. You will collaborate closely with a small SRE team in San Francisco, infrastructure engineers in Reykjavik, and our established infrastructure team here in Warsaw. Warsaw is poised to become a major hub for our future infrastructure engineering and operations. As one of the founding engineers in this office, you will have a substantial influence on how we construct reliable infrastructure, manage incidents, and support our broader company initiatives. This position is based in our Warsaw office with a hybrid schedule - in-office days are Monday, Tuesday, and Thursday. We provide a Contract of Employment (UoP) for our employees in Poland.

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.