For our client we are looking for Fullstack Developer.Client is the emerging leader in the $100B+ cloud communications platform market. Customers like Airbnb, Viber, Whatsapp, Snapchat, and many others depend on our APIs and SDKs to connect with their customers all over the world. As businesses continue to shift to a real-time, customer-centric communications model, client is experiencing a time of impressive growth.Key Responsibilities Lead by example by delivering great, scalable, well-tested code to add new features to the platform. Collaborate with product management, UX/usability/front-end specialists, QA testers, and our internal users to deliver a world-class User Experience across multiple platforms for multiple services Comfortable working independently, within a team and across multiple teams to ensure that we deliver the best customer experience for our services. Performance optimisation and problem diagnosis; Designing/Developing for high-availability; Designing/Developing and testing new features; Supporting release and documentation of developed features Estimating the effort required to develop and implement; Help defining coding standards and development processes; Provide out of hours support as part of an on-call rota Essential Skills and Experience: Strong programming skills Java or Go for backend services Strong experience with JavaScript, Typescript and front end frameworks (Vue Js ideally but React experience will be useful) Strong understanding of responsive web design principles, cross-browser compatibility, and accessibility standards (e.g., WCAG). Proven experience of developing and maintaining enterprise grade systems at scale Experience with building REST/HTTP based services Proven experience building AI driven solutions. This could include the use of agentic AI or other machine-learning based applications. The ideal candidate should be fully conversant in how these technologies can be applied and up-to-date with the current state of the sector as a whole. Use of the AWS AI solutions would be a huge bonus (Bedrock, Sagemaker etc). Experience dealing with highly concurrent, distributed architectures/systems A keen sense of seeing things from our customers’ point of view A drive to always leave things better than how you found them. That applies to code, processes, interactions with people and every other aspect of your work life. Understanding of UX Design, experience with delivering SaaS-based products, and a passion for learning new technologies are a plus. Willingness to get hands dirty and not afraid of low level details; Ability to effectively communicate problems and solutions to the different team members. What we offer Contract: B2B directly with US company Salary: up to 160 pln/h Project for 9 months 100% remote Polish time zone Polish public holidays Recruitment process: 1-2 technical calls