Senior C# Developer

Join Tietoevry as a Junior Software Engineer specializing in C language, where you'll contribute to innovative telecommunications solutions. Be part of a dynamic team that pushes the boundaries of technology and drives growth.

At Veeam, we are committed to being the Data and AI Trust Company, empowering organizations to secure and comprehend their data and AI assets. As the leading provider in data resilience and security posture management, we are uniquely positioned to address the convergence of identity, data security, and AI risk. With our headquarters in Seattle and a presence in over 30 countries, Veeam proudly protects more than 550,000 customers globally, ensuring their businesses operate smoothly. Join us on our journey as we move forward together, fostering growth, learning, and making a significant impact for some of the world’s most prominent brands.About the RoleWe are seeking a motivated Junior C# Developer to become a key part of our team focused on Veeam Backup and Replication, along with its extensions.What You’ll DoDevelop and design REST APIs for Veeam Backup & Replication.Create new products while providing support for existing features.Engage in individual and team development of components and overall product architecture.Technologies We Use:C#, .Net 10, Windows/Linux, MS SQL, PostgreSQL, Multithreading.

Teltonika Networks is looking for a Junior Backend Software Engineer to join the team in Warsaw, Masovian Voivodeship, Poland. The company develops networking equipment for industrial and enterprise use, including routers, switches, gateways, and modems. Teltonika’s technology supports clients in sectors such as Industry 4.0, Smart City, and Green Energy. For more details on their products, visit Teltonika Products. Role overview This position involves hands-on work with embedded Linux software and API frameworks for IoT devices. The team is international and values collaboration to solve technical challenges. The role is well suited to early-career engineers who want to deepen their technical skills while working on real-world projects. Main responsibilities Design, implement, and maintain embedded Linux software for IoT hardware. Develop and support an API framework used by multiple R&D teams. Analyze and integrate new technologies into existing systems. Collaborate with colleagues from different countries to address complex problems. Requirements At least 1 year of experience programming in C. Minimum 1 year working with APIs. Proficient in Shell and Python scripting. Familiarity with Git version control. Experience working with Linux-based systems. Strong English communication skills, both written and spoken. Preferred qualifications Technical degree in a relevant field. Understanding of computer networking concepts. Experience with Lua programming. Knowledge of OpenWrt. Benefits Opportunities for growth within a growing company. Work on ambitious projects focused on industrial networking devices. Private medical care (Medicover Premium) and Multisport card. Hybrid work model with flexible arrangements. Extra day off for your birthday. Team-building activities to support collaboration.

Tieto Tech Consulting seeks a Senior Software Engineer with strong C programming skills to support telecommunications solutions in Warsaw. This position centers on building reliable software that addresses the needs of the telecom sector. Role overview This role involves designing, developing, and maintaining software components for telecommunications projects. Collaboration with team members is a core part of the work, ensuring solutions meet both technical and industry standards. What you will do Develop and refine software in C for telecom applications Contribute to project planning and technical discussions Work closely with colleagues to deliver project milestones Requirements Experience in C programming Background in telecommunications or related fields Ability to work effectively in a collaborative team environment

Join our dynamic team at Inetum Polska as a Python Software Engineer, where you'll play a pivotal role in the development and upkeep of cutting-edge data processing solutions tailored for a vast telecommunications environment. Your primary focus will be on crafting Python-based modules that efficiently load, transform, and analyze network data, in addition to creating supportive tools for monitoring, reporting, and SLA-related processes.Key Responsibilities:Design and implement new Python modules for effective data processing within telecommunications networks.Develop and sustain software that enhances network quality monitoring, comprehensive reporting, and SLA calculations.Construct and optimize Python scripts for data loading and transformation in Oracle databases.Engage in ongoing transformation projects to enhance our technical environment.Provide support and maintenance for existing solutions in production.Participation in on-call support (24/7) may be required, typically one week per month. This rotation is currently inactive but could be reinstated in the future, with readiness to participate if needed.

Role overview Alarm.com is looking for a Software Engineer skilled in C# and .NET to join the team at the EBS Warsaw office. The group focuses on building technology that enhances security and automation for both residential and commercial settings. What you will do Develop and maintain software using C# and .NET frameworks Create and support solutions that enable security and automation features Participate in all phases of the software development lifecycle, from design and coding to testing and deployment Location This role is based onsite in Warsaw, Poland, at the EBS office.

Join our innovative team at inetum2 as a JVM Software Engineer / C Developer. In this role, you will leverage your expertise in Java Virtual Machine (JVM) and C programming to design, develop, and maintain high-quality software solutions.We are looking for someone passionate about technology, who thrives in a collaborative environment and is eager to tackle complex challenges. You will work closely with cross-functional teams to deliver robust applications that meet our clients' needs.

CD Projekt Red is hiring a Software Engineer (C++) to focus on online and multiplayer features at their Warsaw studio. This role is part of the engineering department and helps shape the multiplayer experience for players around the world. Role overview This position centers on developing and refining systems that power multiplayer gameplay. Collaboration is key, as the engineer will work alongside other developers and team members to build engaging online features. What you will do Collaborate with engineers and other team members to develop and enhance online and multiplayer systems. Use C++ to improve game performance and system efficiency. Design and implement new features that support immersive multiplayer experiences. The team Work with a group of experienced professionals dedicated to creating memorable gaming experiences. The team values technical expertise, creativity, and a drive to advance multiplayer gaming.

At Rydoo, we strive to simplify expense management, allowing individuals to concentrate on what truly matters rather than drowning in receipts. With over a million users relying on us, we facilitate faster and smarter expense submission, approval, and control.In line with this mission, Semine has been developing AI technologies since 2015 to eliminate the tedious and repetitive tasks in accounting, empowering finance teams to work more efficiently.In July 2025, Semine united with Rydoo to revolutionize the future of financial automation. Together, we're crafting a comprehensive, AI-driven platform designed to streamline accounts payable and expense management, enabling businesses to operate with greater simplicity, speed, and intelligence.Our international team exceeds 200 talented individuals who believe that innovative technology should enhance the quality of life. If you have visionary ideas and a desire to create impactful solutions, you will find a welcoming environment here.

Join Veeam Software as a Software Developer in Test, where you will be at the forefront of ensuring the quality and reliability of our products. You will work in a dynamic environment, utilizing your expertise in Python or C# to develop automated tests and enhance our testing frameworks.

Join our dynamic team at Veeam Software as a Quality Assurance Automation Engineer specializing in C#. In this crucial role, you will be responsible for designing, developing, and executing automated tests to ensure the highest quality of our software products. Your expertise will help us maintain our reputation for excellence and reliability in the industry.

Role overview This Level 3 Application Support Engineer position at SoftwareMind centers on supporting complex software applications for clients in the telecommunications industry. Based in Warsaw, the role addresses advanced technical issues and helps maintain strong performance and reliability standards across client systems. What you will do Investigate and resolve challenging application problems reported by telecommunications clients Collaborate with development teams to identify root causes and implement effective solutions Support ongoing service delivery by ensuring applications operate smoothly and efficiently Impact This role plays a key part in delivering dependable software solutions for telecommunications clients, directly supporting the quality and reliability of their services.

At Euronet, we are not just developers of payment solutions; we are pioneers in transforming the global landscape of financial transactions. As a renowned leader in payment processing and cross-border transactions, our innovative offerings—from mobile wallets to real-time payment platforms—are driving digital transformation across more than 160 countries.We are excited to welcome a new member to our Project Delivery Team, focusing on the essential Implementation processes.Your Experience @ EuronetAs a valued #Euronetter, you will thrive in a culture that places a strong emphasis on trust, respect, and collaboration. Your efforts will be acknowledged, and your career path will be enriched through substantial professional development opportunities.Perks & Benefits That Matter:Comprehensive private health insurance packageFull-time indefinite employment contract (not a temporary agreement)Hybrid work model (3 days in the office, 2 days remotely each week)An international and professional work environmentOpportunities for professional advancementYour Impact:Assist Business Analysts in defining business needs, processes, and system requirementsDesign solutions based on detailed requirements, functional specifications, and gap analysisTranslate functional specifications into actionable solutions through integrations and configurationsProvide estimates and technical plans for configuration and quality assurance tasksConfigure systems to align with requirementsDocument all configuration activities and support the Change Management processCollaborate with Development teams for enhancement requests or bug fixesConduct training sessions for end users and ensure thorough handover processesIdeal Candidate Profile:Recent graduates with a degree in IT or a related technical fieldIf experienced, a background in Financial, Fintech, Banking, or Electronic Fund Transfer (EFT) industries is preferredPractical experience with any database (SQL, RDBMS, or NoSQL)Basic understanding of Linux and XMLProficient computer skills with an aptitude for learning new software and technologiesFluency in both English and PolishStrong analytical and time management abilitiesWillingness to collaborate within diverse teams, both nationally and geographicallyCapable of complex thinking in IT and business processesAbility to multitask effectivelyAdditional Skills That Will Help You Excel:Experience in software development, testing, or configurationKnowledge of any programming languageEuronet is proud to be an Equal Opportunity Employer, considering all qualified applicants without regard to race, color, religion, gender, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by law.

Join Our Team as a Junior Backend Engineer!We are seeking a passionate Junior Backend Engineer to be part of our innovative team in Warsaw. At Bolt, our engineering teams tackle unique challenges, including sophisticated algorithms for demand forecasting, real-time pricing optimization, route planning, fraud prevention, distributed systems, and much more.About BoltWith more than 200 million customers across over 50 countries, Bolt stands as one of the fastest-growing tech enterprises in Europe and Africa. Our success is driven by our dedicated team members.We are committed to fostering an inclusive atmosphere where everyone feels valued, irrespective of race, color, religion, gender identity, sexual orientation, nationality, age, or disability. Our ultimate vision is to transform cities for people, not cars, and we invite you to help us realize this mission!Role OverviewAs a Junior Backend Engineer, you will play a crucial role in architecting, designing, developing, and deploying our expanding backend systems. Your primary programming will involve Node.js and TypeScript (prior experience with Node.js is not required).You will work closely with key internal stakeholders to design scalable backend systems and APIs that effectively meet their requirements.

Veeam Software seeks an experienced C# Developer to join its Warsaw team. This position is designed for professionals who take pride in building dependable, thoughtfully designed software. Role overview The team emphasizes collaboration and values technical excellence. Developers here work together to achieve high-quality outcomes and maintain a supportive environment. What you will do Contribute to the design and development of software using C# Focus on delivering reliable and maintainable solutions Work closely with colleagues to achieve shared goals Requirements Professional experience with C# development Commitment to quality and attention to detail Interest in collaborative problem-solving

Waymo is revolutionizing transportation with its autonomous driving technology, aiming to become the world's most trusted driver. Originating from the Google Self-Driving Car Project in 2009, Waymo focuses on creating the Waymo Driver—The World’s Most Experienced Driver™—to enhance mobility access and prevent the tragic loss of lives due to traffic accidents. With over ten million rider-only trips and the experience of autonomously traveling more than 100 million miles on public roads, Waymo is leading the charge in the self-driving industry.The Waymo Onboard Infrastructure team is responsible for the foundational software and infrastructure of various components within the Waymo self-driving ecosystem. Our work includes everything from low-level system software to high-bandwidth data logging, inter-process communication (IPC), performance analysis, and comprehensive debugging. We collaborate closely with teams in Hardware, Compute, Sensor, Perception, Behavior, and Machine Learning to create the most efficient and low-latency self-driving solutions available.As a member of the System Software Team, you will focus on the primary compute node of Waymo's on-vehicle compute platform, an integrated embedded system. If you have a passion for building embedded systems with innovative compute hardware and enjoy collaborating with engineering teams that leverage your work, you will thrive in this role.

Join the Positive Side of Technology Known as ZnanyLekarz in Poland and Doctoralia in Spain, we operate globally as Docplanner.Our mission is to develop innovative technology that enhances the quality of life by connecting patients with healthcare providers, streamlining clinical workflows, and supporting healthcare systems utilized by millions every month.At Docplanner, engineering is not just about code; it’s about creating dependable and scalable systems that have a profound impact on people's lives. What we deliver matters in high-pressure situations involving patients, doctors, and clinics, which necessitates a commitment to quality, sound judgment, and strategic thinking.In 2026, we will boost our delivery capabilities across various product domains by transforming our development approach—utilizing AI-driven tools to enhance engineering efficiency and set new standards for designing, delivering, and refining our systems.Why Join Us?Because it’s rewarding to share with your loved ones how you’re contributing to a better world. You’ll rest easy knowing your work has significance and aligns with your values.We aspire to help people lead longer, healthier lives, and this begins with you being your true self. We acknowledge that embracing a diverse range of human experiences enhances healthcare for everyone. We are committed to diversity and will encourage you to bring your whole self to work. You can choose to work fully remotely or in a hybrid model from our offices in Barcelona or Warsaw, depending on team assignments.Key ChallengesAs an engineer at Docplanner, you may tackle challenges in the following areas:Marketplace & SearchDevelop the next-generation marketplace system, overseeing the complete journey from discovery to rebooking. You will harness AI-driven search and onboarding processes to unlock new user engagement and transform one-off bookings into ongoing care relationships.Practice Management Systems (PMS)Create advanced software solutions to support doctors globally. Consolidate the current fragmented landscape and utilize AI to reinvent how doctors prioritize patient care.AI-Powered Clinical Tools (Noa Medic)Design AI-enhanced clinical workflows that go beyond basic administrative tasks. You will develop deep integrations with PMS/EHR systems that become essential tools for medical professionals.

Join the LLI Academy: Now Recruiting Junior Software Developers!We are thrilled to announce the launch of the third edition of our LLI Academy, a program aimed at identifying and nurturing talented junior developers who are passionate about technology, coding, and eager to enhance their skills in a professional setting.This initiative provides aspiring developers with the chance to gain practical experience, receive mentorship, and integrate into our vibrant team.Our previous cohorts have thrived, leading to ongoing collaboration with remarkable junior developers who have transitioned into full-time roles within our company. We are now looking for the next generation of talent to join us!About LLInformaticsLLInformatics is a progressive IT consulting firm, highly regarded by clients throughout Europe and North America. We excel in delivering complex projects with precision and quality, adhering to the highest compliance standards.Our remote-first team of over 100 experts is dedicated to creating innovative digital products that yield significant results. With an emphasis on data-driven decisions and measurable outcomes, we are setting new industry standards, supported by a strong, collaborative company culture that drives our success. Location: Warsaw (on-site for the first 3 months, then the possibility of remote work) Contract Type: UZYour Responsibilities:Develop your programming skills with guidance from mentors and a structured learning path.Implement new features and functionalities into existing projects.Address programming challenges while deepening your knowledge of Ruby.Engage in regular code reviews and receive constructive feedback from seasoned developers.Maintain and enhance existing codebases through bug fixes and refactoring.Create unit, integration, and end-to-end tests to ensure software quality.Requirements:A strong desire to learn and improve coding skills.Basic knowledge of programming languages, particularly Ruby.Ability to work collaboratively in a team environment.

About Us1GLOBAL is an innovative technology leader in mobile communications, offering unparalleled global connectivity solutions for both enterprises and consumers. Our cutting-edge telecom platform features a robust, owned global mobile core network, state-of-the-art in-house developed eSIM technology, and a wide array of telecom licenses, allowing us to operate as a fully regulated telecommunications provider in 40 countries around the globe.We proudly serve some of the world’s most prominent banks, enterprises, and digital-first businesses, including neo-banks, global FMCG leaders, travel industry giants, and payment service providers. Currently, we empower over 70 million people and devices worldwide, facilitating our clients to launch, scale, and innovate confidently within the mobile ecosystem.1GLOBAL is a rapidly growing, profitable entity, projecting full-year revenues exceeding US$200 million and profits over US$25 million by 2025. Our robust cash flow supports continuous investments in infrastructure, platform innovation, and global expansion. Recent years have been pivotal for us, marked by significant enterprise and consumer client acquisitions that enhance our status as a formidable global mobile connectivity provider, dedicated to helping consumer brands thrive in telecommunications.Founded in 2022 by seasoned technology entrepreneurs Hakan Koç and Pyrros Koussios, 1GLOBAL is at the forefront of shaping the future of global telecommunications. We operate as a fully regulated Mobile Virtual Network Operator (MVNO) in 12 countries and as a regulated telecom operator in an additional 28 markets. Headquartered in the Netherlands, with premier R&D centers in Lisbon, Berlin, and São Paulo, our team of nearly 500 experts across 15 countries is unified by a singular mission: to redefine global mobile connectivity through unparalleled technology, scale, and operational excellence.About the TeamThis senior, hands-on Java position focuses on scalable backend systems, long-term ownership, and addressing real-world production challenges. You will be part of a newly formed backend team in Warsaw, dedicated to advancing our eSIM, global connectivity platform, and IoT solutions.The role entails:Enhancing and modernizing existing systems,Developing new services and greenfield components,Boosting reliability, performance, and maintainability across the platform.As a senior engineer, you will also lead the evolution of testing methodologies as systems evolve.