Senior Full Stack/Web Performance Engineer

Join our dynamic team at Capital as a Senior Full Stack Engineer, where you will play a crucial role in developing innovative web applications using React and Node.js. You will be responsible for designing and implementing scalable solutions, collaborating with cross-functional teams, and mentoring junior developers. If you are passionate about technology and eager to make an impact, we want to hear from you!

Bolt is looking for a Senior Full Stack Engineer in Warsaw to help shape and expand an internal task management platform. This role centers on building systems that support real-time decision-making and optimize workflows for agents. What you will do Develop and enhance features for the internal platform, focusing on dynamic task distribution and intelligent workforce management. Create efficient user interfaces that enable agents to work effectively and access actionable insights. Lead frontend architecture decisions and guide the technical direction of the team. Work across the full technology stack, collaborating with engineers and stakeholders. Role overview This position involves tackling product and engineering challenges, from designing scalable interfaces to implementing systems that streamline internal operations. The Senior Full Stack Engineer will play a key part in both technical leadership and hands-on development.

Join our team as a Senior Full Stack Engineer and contribute to cutting-edge projects that push the boundaries of technology. You will work in a collaborative environment, utilizing your expertise in both front-end and back-end development. We're looking for someone who is not only technically proficient but also passionate about delivering high-quality solutions.

Join Our Team!We are on the lookout for a highly skilled Senior Full Stack Software Engineer to be a pivotal part of our innovative teams in Warsaw. At Bolt, our engineering teams tackle unique product challenges that involve sophisticated algorithms for demand forecasting, real-time pricing optimization, routing logistics, fraud detection, and distributed systems, among others.About UsWith a customer base exceeding 200 million across more than 50 countries, Bolt stands as one of the fastest-growing tech firms in Europe and Africa. This remarkable growth is a testament to the dedication and talent of our team members.We foster an inclusive culture where every individual is valued, regardless of race, color, religion, gender identity, sexual orientation, national origin, age, or disability. Our ultimate aim is to create urban environments that prioritize people over vehicles, and we would love for you to help us realize this vision!

CreatorIQ develops an AI-native operating system that enables creator-led growth for more than 1,300 brands and agencies worldwide. The platform connects businesses with audiences through genuine creator partnerships. CreatorIQ has been recognized by BuiltIn LA and NY as a top workplace and was named a Leader in Influencer Marketing Solutions by The Forrester New Wave™. The company has also received multiple G2 awards, including Best Customer Relationship and Top 100 Fastest-Growing Products. The team values intentionality, excellence, collaboration, and humanity, and offers a flexible work model to accommodate different work styles. Role overview The Senior Full Stack Engineer (Creator Recruit) will join the Creator Tools team in Warsaw. This team is responsible for shaping the creator experience on the platform, including payments, social authentication, e-commerce, and campaign workflows. The role focuses on building scalable features and improving user experiences that directly impact creators who use CreatorIQ’s tools for their work and income. What you will do Design, build, and maintain features across the stack to create a seamless experience for creators Collaborate with product and design teams to deliver solutions that address real user needs Take ownership of projects from initial concept to deployment Contribute to architectural decisions and help define the technical direction of the Creator Tools platform Maintain high standards for code quality and long-term maintainability Requirements Extensive experience with modern frontend frameworks Strong background in backend development Proven ability to collaborate effectively within a team Comfort working in an environment where priorities and projects can change Impact This position offers the opportunity to make a clear difference for creators who depend on the platform to grow their businesses and support their livelihoods. The work will help shape the future of the creator economy.

What is Box?Box (NYSE: BOX) stands at the forefront of Intelligent Content Management. Our innovative platform empowers organizations to enhance collaboration, oversee the entire content lifecycle, secure vital information, and revolutionize business workflows through enterprise AI. Established in 2005, Box simplifies operations for leading global entities like JLL, Morgan Stanley, and Nationwide. With headquarters in Redwood City, CA, and offices across the United States, Europe, and Asia, we are committed to helping companies thrive in the era of AI.Joining Box offers a unique opportunity to drive our platform's evolution. Content is the backbone of our work processes, encompassing the billions of files and pieces of information exchanged daily—contracts, invoices, employee records, financials, product specifications, marketing assets, and beyond. Our mission is to bring intelligence to content management, empowering our customers to transform workflows comprehensively. With the integration of AI and enterprise content, the potential for changing how organizations collaborate has never been greater, and at Box, you’ll be at the heart of this significant transition.About the Team:As a Lead Full-Stack Engineer on the Content Creation team, you will be a key player in the development of real-time applications within Box. This team is critical as it represents one of the first points of engagement for customers using our platform. Your contributions will shape the future of content generation within Box.The Content Creation team manages Box's Notes and Canvas products, delivering functionality utilized by our largest user groups, extending beyond just administrative users. This team operates as the sole true real-time service at Box, employing web sockets to facilitate real-time editing. It’s a complex area where we excel, making this a fantastic team to join if you want to impact one of Box's most essential products. The team primarily works with Front-End technologies like React.js, while Back-End tasks are predominantly handled with Node.js.Why Box Needs You?We are looking for you to be a transformative force in developing Box's Core Experiences as part of the broader Build organization, prioritizing value delivery alongside high-tech quality standards.

Join Complexio, where we are revolutionizing enterprise AI by developing an intelligence layer that automatically connects and enhances understanding of an organization’s personnel, processes, and systems. Our innovative platform processes both structured and unstructured data to create a dynamic Event Knowledge Graph, orchestrating a variety of AI models to discover hidden workflow enhancements and facilitate autonomous actions.As a Senior Full Stack Engineer, you will be at the forefront of shaping the user experience for thousands of enterprise users. Collaborating with a talented team of software engineers, data scientists, product specialists, and business analysts, you will help design next-generation web applications that bring our state-of-the-art automation capabilities to life. Your contributions will be vital in transforming complex data insights into user-friendly, efficient, and scalable interfaces, connecting advanced AI infrastructure with tangible business results.If you have a passion for integrating sophisticated front-end engineering, full-stack product development, and cutting-edge enterprise AI solutions, and thrive in a fast-paced, highly technical environment, we invite you to apply!

Join our dynamic team as a Full-stack Developer, where you will play a pivotal role in integrating the Charge app within the electric vehicle ecosystem for a prestigious German automotive manufacturer. This project focuses on ensuring seamless communication between various Charge Point Operators (CPOs) and end-users, emphasizing real-time synchronization of charging station data (availability, power). Your efforts will contribute to a smooth user experience, from locating a charger to invoicing.

Join our dynamic team at Nordsec as a Senior Full Stack Product Engineer. In this role, you will leverage your expertise across the stack to design, develop, and deploy cutting-edge solutions that enhance user experiences and drive business success. You will work collaboratively with cross-functional teams to bring innovative product features to life.

At CreatorIQ, we are revolutionizing the way brands engage with creators, trusted by over 1,300 global brands and agencies. Our mission is to humanize businesses and amplify human impact. We embody our core values: intentionality, excellence, collaboration, and kindness.Recognized as one of the best companies to work for by BuiltIn LA and NY, we have also been named a Fastest-Growing Company in North America by Deloitte Technology Fast 500™ for four consecutive years. Our accolades include being recognized as a leader in IDC MarketScape: Worldwide Influencer Marketing Platforms for Large Enterprises in 2025, and achieving high ratings from G2 and Influencer MarketingHub.Join us in our flexible work environment that promotes both in-person and remote collaboration, fostering innovation and accommodating diverse work styles.Position OverviewWe are on the lookout for a Senior Full Stack Developer to contribute to our exciting new project, Gifting. This innovative solution allows brands to send products to creators seamlessly, manage fulfillment, and track outcomes, propelling the future of creator commerce.In this high-impact role, you will work across the entire technology stack to design and build scalable systems from scratch. Collaborating closely with product and design teams, you will define the architecture, deliver quickly, and enhance a completely new user experience.Technical StackFrontend: React, TypeScript, JoyUI/MUIBackend: Python (Django), Node.js (TypeScript)Infrastructure: AWS (Lambda, EC2)Key Responsibilities:Lead end-to-end feature development across both frontend and backend (equal contribution)Contribute to the architecture and design of our greenfield product, influencing technical direction from the outsetCreate scalable APIs and services leveraging Django and Node.jsDevelop user-friendly, high-performance interfaces with React and modern component libraries

Join our award-winning AI marketing SaaS company as a Senior Full Stack Engineer and play a crucial role in developing innovative solutions that drive our client’s success. In this position, you will collaborate with cross-functional teams to build scalable applications and enhance our platform's capabilities.Your expertise will guide the design and implementation of front-end and back-end components, ensuring a seamless user experience while optimizing performance and maintainability. This role is perfect for someone who thrives in a dynamic environment and is passionate about technology.

Join our vibrant team at Capital, a premier trading platform that is ambitiously expanding its reach globally. Recognized for our award-winning products, we pride ourselves on leveraging cutting-edge technology to provide an unparalleled client experience. We are constantly seeking exceptional talent to help us maintain our high standards of quality.We are currently on the lookout for a skilled QA Engineer with a strong background in both manual and automated testing. If you thrive in a fast-paced environment and enjoy collaborative teamwork, we invite you to contribute to the excellence of Capital.com’s trading platform.

At Saily, we are revolutionizing the way travelers stay connected—eliminating roaming fees and plastic SIM cards in favor of secure, high-speed mobile data across 200+ destinations worldwide. With millions of paying customers and hundreds of thousands actively engaged at any time, our mission is to enhance the travel experience.To deliver the best products, we cultivate an AI-native Product Engineering culture that empowers our engineers to:Take complete ownership of projects—from initial concept to productionDevelop features without the necessity for exhaustive specificationsCollaborate closely with product managers, designers, data specialists, and fellow engineersWork in small, autonomous teams that prioritize innovationLeverage AI agents for specification, coding, analysis, testing, and iterationAchieve double the output compared to a traditional Senior EngineerEnhance our internal agent network and development processesNavigate across the technology stack as requiredPrioritize user and business outcomes over mere outputCore RequirementsDemonstrated experience in designing, building, and deploying AI-native tools or applications with successful measurable outcomesProficient in developing full-stack features for mobile or web applications (frontend and backend)Strong problem-solving skills and a passion for innovation

Join our dynamic team at HOS247 LLC as a Senior Full-Stack Developer in a fully remote capacity. We are on the lookout for talented developers who are eager to enhance and innovate our existing suite of products. In this role, you will work closely with our Chief Technology Officer, collaborating on developing and refining solutions that drive our business forward.The ideal candidate will possess a robust background in full-stack development, with a minimum of three years of hands-on experience in Angular 2+ and Node.js.

Waymo, the leader in autonomous driving technology, is dedicated to becoming the world's most trusted driver. Originating from the Google Self-Driving Car Project in 2009, our focus has been on developing the Waymo Driver—The World’s Most Experienced Driver™. Our mission is to enhance mobility access and significantly reduce traffic-related fatalities. The Waymo Driver currently powers our fully autonomous ride-hail service, having successfully completed over ten million rider-only trips, utilizing its extensive experience from more than 100 million miles driven on public roads and tens of billions of miles in simulation across 15+ states in the U.S.Are you ready to shape the future of transportation with cutting-edge infrastructure for driverless cars?Join our Waymo Simulation team and contribute to the development of groundbreaking systems that will enhance our core simulation capabilities. We are searching for a dedicated Senior Software Engineer who is passionate about creating impactful solutions.

Role overview Sigma Software Group seeks a Principal Full-Stack Engineer with deep frontend expertise for its Warsaw office. The position involves designing and building web applications that put user experience at the center. Collaboration is essential, as the role works closely with colleagues from different disciplines to ensure software solutions meet client expectations. What you will do Design and implement web applications with a strong emphasis on frontend quality and usability Collaborate with cross-functional teams to deliver reliable, high-quality software Lead technical projects and set direction for development efforts Mentor junior engineers and help shape team best practices Requirements Extensive experience in both frontend and backend development Demonstrated ability to lead projects and guide teams Proven track record of mentoring and supporting junior developers Strong commitment to building user-centric software This Warsaw-based role offers the opportunity to influence client projects and contribute to the growth of the team.

Role Overview Miratech is looking for a Senior Full Stack Developer with experience in Java and Angular. Based in Warsaw, this role joins an engineering team that delivers solutions for a range of client projects. What You Will Do Work on full stack development tasks using Java and Angular Collaborate with engineers to build and improve client-facing applications Contribute to project planning and technical discussions What We Offer Opportunities to develop technical skills in a team setting Collaborative work environment Projects that support client success

Join our dynamic team at Talan as a Senior Full Stack Developer! In this role, you will leverage your expertise in both front-end and back-end technologies to create innovative solutions for our clients. You will collaborate with cross-functional teams to design, develop, and deploy applications that meet business requirements and enhance user experiences.Your proactive approach and commitment to quality will be essential as you tackle complex challenges in a fast-paced environment. If you are passionate about technology and eager to make a significant impact, we want to hear from you!

Join Saily, where we simplify connectivity for travelers by eliminating roaming fees and plastic SIM cards, providing secure mobile data at over 200 destinations. With millions of paying customers and countless travelers accessing our services, your contributions will truly matter.We embrace an AI-native Product Engineering culture, where:The Engineer is a builder, tackling customer challenges from concept to implementation.AI Agents assist in coding and automating repetitive tasks, enabling Engineers to focus on impactful work.Everyone is encouraged to identify improvement opportunities and implement solutions.Curiosity and knowledge sharing are core to our team dynamics.Our ultimate goal is to ensure a comfortable and hassle-free journey for our customers.At Saily, we prioritize growth over comfort, contribution over hierarchy, and impact over process. We empower talented individuals with context, autonomy, and AI to enhance their productivity.We are excited to welcome motivated junior engineers to our team. Here, your impact is defined not by years of experience, but by your passion for learning, discipline, and innovative thinking. You'll have the opportunity to shape your environment, and Saily will provide the platform for you to do just that.Expect hands-on experience with AI-driven software development, full access to learning resources tailored to your growth, and the chance to work on a successful and technically challenging product that you will be proud to build.Bring your skills and vision, and become part of the Saily journey!