Principal Engineer - Secondary Systems for Transmission & Distribution

Location: Poland About Us: RTB House is a leading global company that specializes in providing cutting-edge marketing technologies for renowned brands and agencies worldwide. Our unique ad-buying engine stands out as the world's first fully Deep Learning-powered platform, enabling advertisers to achieve exceptional results and meet their objectives throughout every stage of the marketing funnel. We are currently seeking talented engineers to join our Platform Engineering team within the Bidding Platform structure. If you have a passion for system-related topics such as deployment, monitoring, databases, and load balancing, along with experience in leading complex project specifications and coordinating team efforts, we want to hear from you! This is an excellent opportunity for those eager to tackle technically challenging and sophisticated solutions.

Location: Poland (Remote/Flexible) About Us: RTB House is a pioneering global technology company that specializes in cutting-edge marketing solutions for leading brands and agencies around the world. Our innovative ad-buying engine is the first globally to leverage Deep Learning algorithms exclusively, empowering advertisers to achieve remarkable outcomes and fulfill their objectives at every level of the marketing funnel. We are in search of Senior Engineers to join our Bidding Platform team, which forms the backbone of our RTB operations, processing over 20 million requests per second to engage in real-time auctions and deliver advertisements to audiences across more than 90 countries. If you are eager to tackle technically intricate challenges and develop robust solutions, this role is tailored for you! Your Responsibilities: Architect and spearhead the implementation of system modifications to enhance performance, scalability, and observability for global ad display and tracking. Create tools and optimizations that yield measurable advancements in critical user performance metrics. Develop, test, deploy, monitor, and maintain HTTP/gRPC services and batch jobs in Java and Python, ensuring compliance with high engineering standards across all aspects, including setup, configuration coding, and production monitoring. Offer technical leadership: tackle complex system challenges, engage in project planning and scoping, and uphold the highest coding standards through active participation in code reviews.

We are seeking a highly skilled Senior Microsoft Platform/System Engineer to join our dynamic team at Altersolutions in Warsaw. In this role, you will leverage your deep expertise in Microsoft technologies to deliver innovative solutions that drive business success. Your contributions will be instrumental in enhancing our clients' systems and infrastructure.As a key member of our engineering team, you will collaborate with cross-functional teams to design, implement, and optimize Microsoft-based solutions. Your experience will help guide best practices and ensure the highest quality of service delivery.

Oversee the technical management of SimCorp Dimension along with associated enterprise applications.Diagnose and resolve incidents within stipulated operational timelines.Conduct routine software updates and maintenance tasks.Ensure technical documentation is maintained and regularly updated.

Location: Poland About Us: RTB House is an innovative global firm specializing in cutting-edge marketing technologies for leading brands and agencies worldwide. Our proprietary ad-buying engine is the first globally to harness the full potential of Deep Learning algorithms, empowering advertisers to achieve remarkable results at every stage of the customer journey. The Bidding Platform Team plays a pivotal role in our company's success. We collaborate to develop system modules and components that proficiently manage over 24 million queries per second, maintaining an impressive low latency of 50 ms. Your Responsibilities: Architect and develop a diverse range of modules and components within a system that efficiently handles over 24 million queries per second with minimal latency. Optimize developed software focusing on response time and resource utilization. Guarantee the reliability and scalability of implemented solutions. Design performance and correctness tests for new system components. Evaluate new technologies for potential application in production environments. Construct tools for monitoring and analyzing production system operations. Continuously enhance existing tools and processes for improved efficiency.

AECOM is looking for a skilled Senior Engineer specializing in Transmission and Distribution (Primary). In this pivotal role, you will spearhead the design engineering for High Voltage Substation projects, ensuring that engineering deliverables related to primary circuits are produced on time and to the highest quality standards.Your focus will be on executing project design packages with technical precision while guiding and coordinating CAD designers and drafters in the development of comprehensive drawings and models. The position demands extensive hands-on experience in primary engineering for substations, coupled with effective project delivery in the transmission and distribution sectors.Key ResponsibilitiesDeliver comprehensive primary circuit engineering packages for HV Substation projects, aligning with project scope, timelines, and quality standards.Create and generate primary substation design deliverables, including Single Line Diagrams (SLD), substation layouts and equipment arrangements, busbar and conductor designs, electrical clearances and safety protocols, and earthing and lightning protection calculations.Ensure adherence to project specifications, client standards, and international guidelines (IEC / IEEE / AS).Prepare and uphold high-quality engineering documentation and design reports.

AECOM Enterprise Capabilities is in search of a Senior Engineer specializing in Transmission & Distribution (Secondary). This pivotal role involves overseeing the design and implementation of secondary engineering systems for High Voltage Substations, which encompasses protection, control, automation, and communication systems. The focus is on delivering superior engineering outputs throughout all phases of projects including Front End Engineering Design (FEED), Detailed Design, Construction, and Commissioning support, while ensuring adherence to technical standards, constructability, and reliable substation operations.Generate and present secondary design documentation for High Voltage Substations.Formulate protection and control philosophies, contributing to Basis of Design documentation.Execute engineering designs for AC/DC auxiliary systems, control circuits, interlocking, and automation interfaces.Assist in relay configuration and protection scheme design (distance, differential, overcurrent, busbar, transformer protection, etc.).Ensure designs are feasible, constructible, and consistent with project scope, timeline, and budget.Collaborate closely with the Project Engineer and/or Project Manager to facilitate engineering planning, monitor deliverables, and ensure technical coordination.Work in conjunction with primary, civil, and SCADA/telecom disciplines to guarantee an integrated and clash-free design.Provide limited technical support to junior engineers when required, without formal mentorship obligations.

Join our dynamic Product Security team as a Senior Platform Security Engineer, where your expertise will be crucial in safeguarding our platform that supports multiple products and handles sensitive, high-value information. With our operations expanding, we seek two professionals to strengthen our security efforts.Your role will involve hands-on engineering, where you will design, build, and deploy robust security and privacy controls. This is not about merely defining policies; you will actively contribute to the security architecture of our systems.Your responsibilities will include enhancing supply-chain security through SAST, SCA, container scanning, and CI/CD hardening. Expect a varied role that will challenge you across multiple domains without confining you to a single specialty.What Success Looks Like:Within 90 days, you will have implemented significant, production-level security enhancements.You will take ownership of components of the AuthN/AuthZ model and its execution.You will develop a comprehensive understanding of our data flows and associated privacy risks.Establish yourself as a trusted advisor across teams, able to confidently voice concerns and provide rationale.Effectively reduce risk through practical measures rather than superficial security actions.Your Work Style:This role offers a high degree of autonomy, encouraging you to identify and address issues independently.You will collaborate closely with engineers from different teams, fostering a culture of teamwork.Engaging in constructive disagreements is encouraged, with decisions rooted in data and threat modeling.You will have the authority to block releases on security or privacy grounds when necessary, following clear escalation paths.Proactively addressing problems, even beyond your immediate area, is expected.

Altersolutions is seeking a Senior Platform Engineer (Developer Experience) to lead the establishment and standardization of engineering practices, enhance developer workflows, and define standards for CI/CD and collaboration. This role melds hands-on DevOps expertise with a strong focus on clarity, comprehensive documentation, and effective process design.The primary objective is to boost the efficiency, consistency, and scalability of our engineering organization. In this capacity, you will collaborate closely with engineering leads, product managers, and other key stakeholders to ensure our operational methods are thoroughly documented, clear, and actionable.Key ResponsibilitiesDesign, document, and maintain comprehensive software development processes, encompassing coding standards, branching strategies, testing protocols, release management, and deployment workflows.Engage with engineering managers, team leads, and product teams to gather insights and best practices, facilitating the seamless adoption of tools and methodologies.Convert intricate technical workflows into clear, concise documentation and visual aids (such as flowcharts, process maps, checklists, and templates) to enhance understanding.Assess and implement tools aimed at improving developer experiences (e.g., feature flagging, local development environments, code quality tools).Oversee a central documentation repository (e.g., Confluence, Notion, or Git-based systems), ensuring that all documentation remains current and version-controlled.

Docplanner has spent over ten years reimagining how people experience healthcare. The company began by questioning whether patients truly sat at the center of care, and has since helped millions share reviews about their medical visits. Alongside this, Docplanner has introduced digital tools that make appointment management easier for doctors. The goal remains clear: make healthcare more human and accessible. Today, Docplanner operates in 13 countries and supports over 90 million patients each month. More than 300,000 healthcare professionals use the platform. Backing from investors like Point Nine Capital, Goldman Sachs Asset Management, and One Peak Partners has fueled steady growth. The team now includes over 2,500 employees, yet still values the entrepreneurial spirit that shaped its early years. Tech at Docplanner The Docplanner Tech team brings together more than 400 engineers, data scientists, and product experts. Many have built long careers here, contributing to a culture that values both innovation and lasting collaboration. New team members are welcomed with genuine enthusiasm. For more insights into the company’s culture, see Glassdoor reviews or watch this video. What makes work here meaningful? Projects at Docplanner have a direct impact on healthcare for millions. The company values individuality and encourages people to bring their full selves to work. Diverse perspectives are seen as essential to better solutions. The workplace supports both remote and virtual collaboration, making it easy to contribute from anywhere. Location details The Senior Platform Engineer - AI Innovations role is based in Warsaw. Remote-friendly options are available.

Role overview Sigma Software Group is hiring a Senior Data Engineer in Warsaw to focus on integrations and the data platform. This position involves designing and building solutions that connect data across the company’s platforms. Collaboration with teams throughout the organization is central to keeping data moving reliably and strengthening the overall data architecture. What you will do Design and implement data integration solutions for various platforms Work closely with cross-functional teams to keep data flowing seamlessly Optimize and maintain data pipelines for performance and reliability Monitor data quality and drive improvements where needed Apply best practices in data management Support the ongoing development of the company’s data architecture Impact This role plays a key part in enabling data-driven decision making at Sigma Software Group. By ensuring reliable, high-quality data is available when needed, the Senior Data Engineer helps establish data as a strategic asset for the organization.

Join our dynamic ML Platform team at Bolt as a Senior ML Platform Engineer, where you will play a pivotal role in designing, developing, and optimizing our AI Infrastructure. This infrastructure powers Bolt's intelligent services, making machine learning and artificial intelligence easier to implement at scale.We are a rapidly growing tech company with over 200 million customers across more than 50 countries. Our mission is to create cities that prioritize people over cars, and we believe an inclusive environment is key to achieving this goal. We welcome applicants from all backgrounds and walks of life.

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.

Engineering Manager - Platform** This role can be based remotely in Finland, Switzerland, Poland, UK, Italy, or Germany **At Scandit, we empower individuals with superhuman capabilities. From enabling delivery drivers to optimize their routes, matching patients with their medications, to enhancing retail operations, our cutting-edge technology automates workflows and delivers actionable insights across diverse industries. Join us in our mission to innovate and elevate Scandit to new heights.About the RoleAs the leader of our Platform Engineering (DevOps & SRE) team, you will oversee the vital cloud infrastructure and CI/CD pipeline ecosystem that supports our entire engineering division. Our team is dedicated to refining engineering practices, ensuring efficiency, and accelerating delivery speed. We leverage modern tools such as AI-assisted workflows to enhance planning and execution.We seek an Engineering Manager to guide our Platform Engineering team, providing clarity, structure, and consistent execution. You will collaborate closely with product engineering teams, embracing AI-enabled tools and methodologies to speed up development and enhance engineering effectiveness. This position offers opportunities for expanded responsibilities as Scandit continues to grow, including leading additional engineering initiatives or teams.What You Will DoLead, mentor, and nurture your team.Provide structure and clarity to planning, execution, and reporting.Manage the operation and continuous enhancement of our cloud infrastructure and CI/CD pipelines.Drive cross-team initiatives in security and compliance, such as reducing Snyk vulnerabilities and supporting ISO-related efforts.Enhance security, reliability, and cost efficiency through disciplined processes and clear accountability.Establish roadmaps, milestones, and progress reporting (like OKRs) to keep stakeholders informed of plans, risks, and delivery timelines.Engage in proactive collaboration with product and engineering teams to align priorities and successfully execute shared initiatives.Identify bottlenecks and spearhead improvements to boost engineering velocity.Embrace additional responsibilities and cross-team leadership as Scandit continues to expand.Who You AreYou have a strong background in DevOps/SRE practices.You possess excellent leadership and team-building skills.You are adept at using modern tooling and methodologies to drive engineering efficiency.

Design, develop, and enhance API platforms and application security solutions using Java (JDK 21).Deploy and manage software solutions on the OpenShift platform.Create and maintain documentation to assist the organization in the implementation of developed solutions.Develop tools and procedures for effective monitoring, logging, and deployment optimization.Execute essential operations including patching and certificate management.

QED AI is an innovative technology firm dedicated to enhancing public health and food security in Sub-Saharan Africa. By developing cutting-edge digital infrastructure and leveraging AI, we operate at the critical intersection of humanitarian aid and scientific research. Our initiatives include monitoring diseases such as HIV, malaria, and tuberculosis, as well as conducting nutrient analyses for crops and soils across various African nations. Our funding sources include prestigious philanthropic and governmental organizations such as the Global Fund, Gates Foundation, and the CDC.We are seeking a mid/senior Data Platform Engineer (Backend) to join our dynamic team in Warsaw. Ideal candidates will possess the following:Proven experience in designing and maintaining data pipelines utilizing ETL and/or ELT methodologies, with a critical eye on trade-offs rather than adhering to a single pattern.Solid understanding of data pipeline reliability, including concepts of idempotency, backfills, and the management of late or corrected data.Ability to structure data systems into distinct layers (e.g., raw, cleaned, curated) and articulate their varying functions and guarantees.Experience with making informed decisions between batch, micro-batch, and streaming methods based on latency, accuracy, and operational complexity.Strong foundation in software engineering principles, version control, writing clean code and tests, robust design, and a grasp of basic data structures and algorithms.Ability to conceptualize logical software architectures and communicate clearly, both verbally and in writing.Eagerness to engage with a diverse range of problems and technologies.Willingness to participate in regular design sessions, code reviews, and collaborate effectively within teams.Experience with UNIX-based or OSX-Darwin development environments.Working proficiency (≥C1) in English, both spoken and written (minimum typing speed of 45 words per minute).Interest in collaborating with individuals from different cultural backgrounds.Demonstrated emotional resilience and social intelligence.A genuine passion for your work and a generally optimistic outlook, while recognizing the value of constructive skepticism.Additional skills that are advantageous but not mandatory include:Understanding of analytical data modeling concepts, including hierarchical and dimensional modeling.

Join the forefront of healthcare technology with Docplanner! You may recognize us by our previous name, Znany Lekarz. Over the past 12 years, we’ve been on a mission to revolutionize patient care in healthcare. We empower patients by providing them with tools to leave and read reviews about their medical experiences. Simultaneously, we equip healthcare professionals with technology that streamlines booking management, allowing them to focus on what they do best: caring for patients. Today, we're inviting you to be part of our journey to enhance the human aspect of healthcare.Docplanner's Global ImpactOperating in 13 countries and trusted by over 90 million patients monthly, Docplanner has become a go-to platform for more than 300,000 specialists. We are backed by reputable venture capital firms like Point Nine Capital, Goldman Sachs Asset Management, and One Peak Partners. With over 2,500 employees worldwide, we maintain the innovative spirit of a startup, even after a decade in the industry.About Docplanner TechAt Docplanner Tech, our diverse team of over 400 engineers, data analysts, and product managers is dedicated to building our products for all locations. Many of our team members have been with us for over five years, and we take pride in welcoming each new member with enthusiasm.Discover more about our workplace culture through our Glassdoor reviews or see how it feels to be your authentic self at work in this video.Why Join Us?Being part of our team means contributing to a better world, making a tangible difference. You can rest easy knowing your work aligns with your values and has a meaningful impact. We believe in embracing diversity and creating a healthcare experience that reflects the rich tapestry of human experience. With us, you can bring your whole self to work—whether that means working remotely or choosing to come into the office.

Join the forefront of online privacy with the world’s most advanced VPN.Are you a proactive problem-solver who thrives in dynamic environments? Become a vital member of the team that developed Threat Protection Pro, the NordLynx protocol, and the fastest VPN worldwide—innovations that empower individuals with privacy, security, and control over their digital lives.Your Contribution: Enable millions to regain their online security, privacy, and data management.At NordVPN, we safeguard millions of users every day through an expansive global edge infrastructure comprising thousands of servers across numerous countries. The platform engineering team is responsible for building and maintaining the internal backend services that facilitate this protection.We are seeking a Staff Site Reliability Engineer (SRE) to design, build, and enhance these critical systems. This role demands a high level of ownership—you will architect solutions and deploy them to production. Colleagues will depend on you when it comes to rethinking architecture or scaling services from inception to global deployment.Key ResponsibilitiesDesign and manage on-demand, globally distributed backend services.Make strategic architectural decisions regarding the integration and scalability of internal services.Oversee the entire lifecycle: planning, implementation, monitoring, incident response, and postmortems.Enhance infrastructure tooling and automation processes.Contribute to our engineering standards, documentation, and operational maturity.Assess and incorporate AI tools (including LLMs, Claude Code, and model integrations) into engineering workflows.Essential QualificationsExperience in designing and operating globally distributed systems.Proficiency in systems architecture, service communication, data flow, and resilience patterns.Extensive Linux administration experience at scale (including systemd, kernel tuning, and debugging production systems).Expertise in Docker—building, shipping, and running containers in production environments.Familiarity with databases such as PostgreSQL, MySQL, Redis, OpenSearch, and VictoriaMetrics.Experience with web servers, load balancing, and failover mechanisms (e.g., Nginx, HAProxy).

Uni Systems is looking for a Lead ServiceNow Platform Specialist to join the team in Warsaw. This role focuses on guiding the ServiceNow platform through its full lifecycle, from design and implementation to ongoing operation and optimization. The position calls for close collaboration with Architects, Developers, and internal stakeholders to ensure the platform remains secure, reliable, and aligned with business needs. Main responsibilities Ensure the ServiceNow platform is secure, available, and performing well, working closely with Architects and Developers. Oversee development, enhancements, and troubleshooting activities. Manage the platform’s lifecycle, including design, implementation, operation, and optimization. Conduct demonstrations and training sessions for end users and support teams. Collaborate with stakeholders to assess expectations and platform requirements. Collect, analyze, and validate business and user requirements. Translate requirements into technical solutions that meet architectural standards. Communicate solutions to both technical and non-technical audiences. Support the rollout of service management capabilities across the organization. Coordinate platform development and enhancement with Architects and Developers. Provide input on business requirements and technical designs. Contribute to solution architecture and development. Assist cross-functional teams with risk management, security, and disaster recovery planning. Maintain up-to-date documentation, including technical specifications, SOPs, user guides, and knowledge base articles. Collaboration and impact This position works at the intersection of technology and business, ensuring ServiceNow meets evolving organizational needs. The Lead ServiceNow Platform Specialist communicates with both technical and non-technical stakeholders to deliver effective solutions and support ongoing platform improvement.