Senior Software Engineer at Complexio | Warsaw

Join our dynamic team at Inetum2 as a Senior Fullstack Software Engineer, where you'll be at the forefront of developing innovative software solutions. In this role, you will leverage your expertise in both frontend and backend technologies to build scalable applications that enhance user experience. Collaborate with cross-functional teams to design, develop, and maintain high-quality software products.

Join Box Inc. as a Senior Fullstack Software Engineer and take the next step in your career! We are looking for an experienced engineer who is passionate about building scalable web applications and innovative solutions. In this role, you will work collaboratively with cross-functional teams to design, develop, and maintain high-quality software that meets the needs of our clients.

Join Turnitin as a Senior Fullstack/Backend Software Engineer, where your expertise in backend development, particularly with Java and serverless architectures, will be pivotal. We are seeking engineers who are enthusiastic about creating scalable distributed systems and delivering robust software solutions for our acclaimed educational platform.As an integral member of our shared services team, you'll spearhead the development and enhancement of the core systems supporting both our existing and upcoming applications.Key Responsibilities:Architect, develop, and optimize scalable backend services utilizing Java and serverless technologies (AWS Lambda).Design and implement RESTful APIs and event-driven architectures.Contribute to frontend component development as required.Enhance performance and cost-effectiveness of existing services.Collaborate with cross-functional teams, including Architects, Product Managers, and engineering leads, to deliver innovative solutions.Mentor junior developers and promote best practices.Establish and manage CI/CD pipelines.Maintain high-quality coding standards through peer reviews, automated testing, and compliance with development best practices.Document shared components comprehensively, providing usage guidelines and examples.

Join the Innovative Team at SienaAt Siena, we are pioneering the first intelligence layer for customer experience. Our vision is to create an operating system of AI agents that seamlessly learn, remember, and act across all customer touchpoints—from support interactions to shopping experiences, including voice and social media.Siena goes beyond mere automation; we empower shopping agents, foster persistent customer memory, deliver actionable business insights, and cultivate empathetic interactions that resonate with users.We are redefining how businesses comprehend and engage with their customers, transforming every interaction into a learning opportunity for future enhancements.About Our TeamOur small, distributed team is committed to making a significant impact. Each member plays a vital role, as we emphasize efficiency and creativity in our work, making collaboration both swift and enjoyable.If you’re passionate about creating groundbreaking products, this is your chance. We are developing agents that do more than just respond to inquiries; they remember customers, learn from each engagement, and unify experiences across channels.Your RoleAs a Fullstack Software Engineer at Siena, you will manage projects from inception to completion, enhancing and optimizing features within our AI-driven customer support automation platform. Collaborating closely with the product team, you will help shape our development roadmap while constructing reliable, high-performance systems. Your contributions will facilitate millions of customer interactions with global brands, where your work's reliability and speed will directly influence business success. If you enjoy tackling real-world challenges, excel in dynamic environments, and take pride in delivering exceptional products, this role is perfect for you.Your ResponsibilitiesDesign, develop, and maintain scalable features across the entire tech stack (frontend, backend, and infrastructure).Collaborate with Product to break down project scopes into iterative, impactful releases.Integrate advanced LLM capabilities into real-world enterprise workflows.Work on an AI-first product, embedding cutting-edge LLM capabilities into customer support frameworks.Address complex engineering challenges, optimizing API performance and refining microservices architecture.Enhance and maintain our cloud infrastructure (AWS) with a DevOps mindset.Exhibit high levels of agency and ownership—taking initiative, making decisions, and propelling ideas to production.

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

Waymo is at the forefront of autonomous driving technology, dedicated to becoming the world's most trusted driver. Originating from the Google Self-Driving Car Project in 2009, Waymo has concentrated on developing the Waymo Driver—The World’s Most Experienced Driver™—to enhance mobility access and prevent traffic-related fatalities. The Waymo Driver supports Waymo’s fully autonomous ride-hailing service and is adaptable across various vehicle platforms and applications. Having completed over ten million rider-only trips, it has also autonomously navigated more than 100 million miles on public roads and tens of billions in simulated environments across 15+ U.S. states.Are you ready to shape the future of driverless car infrastructure?Join our Waymo Simulation team and contribute to designing the next era of transportation! We are seeking a dedicated Technical Lead Manager with a passion for building systems that enhance Waymo's core simulation technologies.

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.

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!

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.

Join Our Innovative Team as a Senior Fullstack Developer!At Telemedi, we are in search of talented Senior Developers to enhance our IT team as we embark on an exciting journey of organizational growth, focusing on programming with AI. As a Senior Developer, you'll skillfully navigate an AI-integrated IDE and excel at delivering significant business value through IT solutions while maintaining high programming standards.The era of traditional IT is over; a new phase in software development is upon us. Telemedi is at the forefront of this transformation. We believe that by combining cutting-edge technologies with technical expertise and exceptional commitment, we can build faster, better, and more efficiently than ever before.Our developers work with Cursor AI (cursor.com) — an IDE that revolutionizes the programming paradigm. We are capable of accomplishing in hours what takes other developers days, and we expect the same from you.Apply if you: Want to work in a product company with a fascinating, extensive, and complex business domain where your efforts today translate into tangible outcomes tomorrow. Enjoy tackling significant challenges and thrive in complex applications. Appreciate a dynamic environment where exciting developments are constant. Take initiative and strive to elevate team standards daily. Feel a profound sense of responsibility for your contributions and those of your team. Welcome constructive feedback about your work with an open mind. Are eager to understand the business and communicate effectively with others (not just within IT). Can quickly and efficiently create high-quality applications/features. Are confident in your technical knowledge and capable of enhancing application quality (including gradually improving legacy code). Proactively seek to improve processes around you. Your Responsibilities: Participate in crafting IT solutions from inception to completion (we do not operate in silos). Develop web applications (new features, bug fixing, refactoring). Engage in designing the architecture of new solutions and development infrastructure. Contribute to code reviews while ensuring the quality of created solutions. Continuously raise the standards of development processes. Collaborate closely with team members (Developers, PMs/POs, QAs). Maintain high programming quality and rapid task delivery (both individually and as a team). What We Expect: Excellent understanding of business and a broad context with a high level of detail. Outstanding ability to translate business goals into IT solutions that are as simple as necessary and not more complex than absolutely required. A strong desire and perseverance to continuously elevate team standards (both in terms of quality and efficiency).

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 innovative team at Aurora Solar as a Senior Software Engineer. In this role, you will help drive our mission to revolutionize solar energy solutions on a global scale. Your expertise will contribute to developing cutting-edge software that empowers solar professionals and enhances efficiency in solar project management.As a key player in our engineering team, you will work collaboratively with cross-functional teams to design, implement, and optimize software solutions that meet the needs of our international clientele. Your contributions will directly impact the future of renewable energy technology.

Join the forefront of digital privacy with Nordsec!Are you a passionate and innovative software engineer ready to tackle complex challenges? Become a pivotal part of our dynamic team responsible for developing cutting-edge technologies such as Threat Protection Pro, the NordLynx protocol, and the world’s fastest VPN. Your contributions will empower millions of users to reclaim control over their online security, privacy, and data.

Join our dynamic team at inetum2 as a Senior Software Quality Assurance Engineer, where you will play a crucial role in ensuring the quality and performance of our software solutions. You will be responsible for developing and executing test plans, identifying bugs, and working collaboratively with developers to enhance product quality.

Join our dynamic team at Box, Inc. as a Senior Software Engineer specializing in Home Web applications. In this role, you will leverage your extensive experience in software development to design and implement innovative solutions that enhance user experiences. Collaborate closely with cross-functional teams to deliver high-quality software solutions that align with our strategic goals.

Join our dynamic team at Alter Solutions as a Senior Java Fullstack Developer, where you will leverage your expertise in Java and full-stack development to create innovative solutions. You will work collaboratively within a talented team, contributing to both frontend and backend development, and enhancing our software architecture.

Join our dynamic team at Altersolutions as a Fullstack .NET Angular Developer! In this role, you will have the opportunity to work with cutting-edge technologies and contribute to innovative projects that impact our clients positively. Collaborate with cross-functional teams to design, develop, and implement robust applications that meet business requirements.