Middle Flutter Developer

About UsAt Ruby Labs, we are at the forefront of technological innovation, crafting and managing groundbreaking consumer products across various sectors, including health, education, and entertainment. Our dynamic teams are dedicated to shaping the future of consumer-oriented solutions, and we are constantly on the lookout for passionate individuals to enhance our mission. Discover more about our journey at https://rubylabs.com/about-us/.About the RoleWe are seeking an adept Middle Golang Developer to join our team. In this role, you will take charge of developing scalable, high-performance backend services and will play a key role in enhancing our billing system. As part of a cross-functional team comprising engineers and product managers, your work will focus on delivering consistent, sustainable results. We value individuals who are enthusiastic about innovation, eager to stay updated with emerging technologies, and possess exceptional communication and collaboration skills, especially in a remote setting.Key ResponsibilitiesSoftware Development: Engage in the development and maintenance of robust backend services and applications utilizing Golang.Microservices Architecture: Design, implement, and optimize microservices-based applications, ensuring they are scalable, reliable, and maintainable.Container Orchestration: Work in conjunction with the DevOps team to deploy and manage Golang applications within Kubernetes clusters, utilizing Helm for efficient package management.Database Management: Design and refine database schemas, queries, and transactions with a focus on Postgres, ensuring data integrity and performance. Use Redis to enhance application efficiency.Billing System: Develop and improve the billing system to guarantee accurate and timely processing of financial transactions.Code Review: Perform code reviews to uphold code quality, best practices, and compliance with coding standards.Collaboration: Work collaboratively with the cross-functional team, including DevOps, backend and frontend developers, QA, and product management, to grasp requirements and deliver high-quality software solutions. Maintain comprehensive documentation for code, architecture, and processes to ensure effective knowledge transfer.

Join Netguru, a reputable leader in digital commerce, as we partner with prominent brands to revolutionize B2B solutions, marketplaces, and retail ecosystems. Since our inception in 2008, we have empowered businesses with innovative technology, AI-driven personalization, and exceptional engineering and design expertise. Proudly certified as a B Corporation®, we are trusted by industry giants including IKEA, VW, OLX, Delivery Hero, Żabka, Wolt, Careem, and Vinted.Freelancing at Netguru:As a Netguru freelancer, you have the unique opportunity to tailor your work environment. You will determine when, where, and how you engage with projects and tasks. Our team ensures that your assignments align with your skills and interests, providing you with diverse opportunities across various industries to enhance your experience and skill set.Moreover, as a Netguru freelancer, you are not just an outsider; you become an integral part of our team with the possibility of full-time collaboration.Are you ready to make a significant impact? Come aboard Netguru, and let’s create exceptional software together.We are currently looking for a skilled Senior Golang Developer.This role is a freelance position on a B2B contract, focusing on the development and scaling of distributed systems and services. The position is 100% remote and requires the selected candidate to be available to start as soon as possible.B2B Contract | Up to 39 EUR/h | Remote | Immediate Start

SKELAR is a pioneering Ukrainian venture builder dedicated to establishing international tech businesses. We collaborate with co-founders to assemble top-notch teams that excel in global markets.Currently, SKELAR operates a range of businesses across various niches, from EdTech to marketplaces. These companies consistently rank among the top startups and product firms in Ukraine, achieving high rankings in the App Store and creating platforms that millions use daily. Major media outlets like TechCrunch and Wired have featured SKELAR's businesses.We take pride in a robust team of over 1,000 specialists who possess remarkable expertise and ambitious goals. Our people are the most valuable asset of the company, and we strive to build businesses with the best talents available in the market.RiseGuide is an expert-driven microlearning mobile application designed around the principles and examples of exceptional role models. Our users are guided by insights from Andrew Huberman and Simon Sinek to break harmful habits, enhance their social media presence with strategies from Alex Hormozi and MrBeast, and develop charisma inspired by Robert Downey Jr. and Steve Jobs.Key Facts about RiseGuide:Achieved unit economics in just 6 weeks and have been actively scaling since (we had an incredible Q5 and grew fivefold last year).Over 200,000 paid users, with ratings of 4.6/5 on the App Store and 4.4/5 on TrustPilot.A team of over 60 individuals from successful tech businesses and top management programs worldwide.We aim to redefine the self-improvement industry, granting users access to expert knowledge on demand. To achieve this, we are seeking a Software Engineer (Golang) to help develop our product's backend and turn our ambitious goals into tangible achievements.What We Offer:Opportunity to make architectural decisions and build systems from the ground up.Minimal bureaucracy and maximum speed to market. A small team focused on results and rapid deployment.Fast feedback loops — your solutions will immediately impact production and influence hundreds of thousands of users.The chance to join the team early and define your area of responsibility.Pure Tech: modern stack with Zero Legacy.

What You'll DoDesign and develop cutting-edge AI inference and model training cloud products that are optimized for Kubernetes, focusing on autoscaling inference servers and distributed training jobs across GPU fleets.Write clean, efficient, and maintainable Go code to drive Kubernetes controllers, operators, and custom resources that support AI workloads.Develop APIs, CLIs, and developer tools that streamline the deployment, lifecycle management, and monitoring of AI applications.Create features that enhance serverless container workflows for AI, ensuring rapid cold starts, resource-efficient scaling, and effective workload isolation.Contribute to the system's performance, reliability, and security, with an emphasis on AI-specific challenges such as GPU scheduling, job orchestration, and data throughput.Keep abreast of advancements in the Kubernetes ecosystem (e.g., K8s-native ML tooling, scheduling improvements, SIGs) and influence our product roadmap accordingly.

Are you a growth-oriented professional eager to achieve results and create tangible value? If you thrive on enhancing team efficiency, solving complex problems, and delivering innovative solutions, we invite you to join our dynamic team at MasterBorn! We are committed to being the premier place for you to advance your career.At MasterBorn, we excel in software development with a talented team of world-class developers and designers. Our technology stack includes React, Node.js, and TypeScript. We collaborate with established companies and emerging startups, working on diverse projects that present exciting challenges and opportunities for crafting cutting-edge solutions.Enjoy the flexibility of working within the Polish time zone while engaging with clients from various sectors in the USA, including Fintech, Sportstech, Medtech, and more.

Spoton is looking for a Senior Software Engineer II with a focus on Golang to join the Partnerships team. This remote position based in Poland centers on building and supporting integration solutions that connect Spoton’s products with partner services. Role overview This role involves designing, developing, and maintaining scalable software that enables smooth partner integrations. Projects often have a direct impact on how Spoton collaborates with external organizations, making strong technical decisions important for success. Collaboration Working as part of a distributed team, you will engage with colleagues across different functions to improve and extend product capabilities. The Partnerships team values engineers who contribute ideas and work well with others to solve complex challenges. What you bring Deep experience with Golang in a production environment Strong skills in designing and maintaining scalable integration solutions A collaborative approach to working with cross-functional teams Interest in technology and creative problem solving

About the TeamJoin the Sell Online Tribe, a dynamic group that empowers merchants to establish their presence online. We create innovative tools that enable millions of entrepreneurs, from barbers to bakers, to market their products and services effortlessly. Our core focus lies in the Online Store and Bookings products, which form the backbone of SumUp’s ecosystem, allowing merchants to manage appointments, highlight their offerings, and process payments—all from their mobile devices.We are a collaborative, cross-functional team of Product Managers, Designers, and Engineers dedicated to delivering exceptional mobile experiences. As a part of this team, you will play a crucial role in expanding into new sectors, bridging the gap between web and mobile, and making digital selling seamless for small businesses worldwide.About the RoleAs a Senior Backend Engineer, you will be instrumental in enhancing SumUp's major merchant-facing online products within the Bifrost team. You will contribute to the development and scaling of key products such as Payment Links, Virtual Terminal, and Unified Gift Cards, while also working on integration solutions that are vital for numerous other SumUp offerings.We are looking for a developer who prioritizes reliability, teamwork, and continuous growth. Your backend expertise will thrive in a high-impact environment where your contributions directly influence merchant success and team scalability.What You’ll DoEnsure scalability and continuous growth of high-priority online products at SumUpDrive the implementation, development, and integration of Online Checkouts across SumUpEngage actively in planning and review sessions at quarterly and sprint levels, providing constructive feedback and estimationsMonitor existing services, applying necessary fixes to maintain platform reliabilityDevelop new features with maintainable and testable codeEnhance application performance for scalabilityParticipate in code reviews to uphold high coding standardsYou Will Excel in This Role If:You have 5+ years of experience in backend engineering with GolangYou possess a robust understanding of fundamental system architecture, design principles, data modeling, and API designYou have substantial experience with distributed and fault-tolerant systemsYou have a passion for delivering high-quality software solutions

Join Kaseya, a leading provider of IT management software, as a Software Engineer II specializing in Golang. In this dynamic role, you'll collaborate with a talented team to develop innovative software solutions that empower IT professionals globally. Your expertise in Golang will be crucial in enhancing our applications and ensuring the highest standards of quality and performance.

Join IDT Corporation as a dynamic and experienced Senior DevOps Engineer specializing in Golang. In this role, you will leverage your expertise in AWS, Kubernetes (both public and private cloud), Docker, Hashicorp Vault, and Consul to design, implement, and maintain robust infrastructure and CI/CD pipelines that ensure reliability, scalability, and security across all operations.

Join Nordsec as a Senior Backend Engineer and be a part of our innovative team in Warsaw. We are seeking a talented engineer experienced in Golang to help us build robust backend systems that power our applications. You will work closely with cross-functional teams to design, implement, and optimize backend services that deliver exceptional user experiences.

Join Our Team!Welcome to Xebia, where innovation and expertise thrive. With nearly 20 years of experience in delivering cutting-edge digital solutions across various industries globally, we've partnered with renowned brands like UPS, McLaren, Aviva, and Deloitte.We are deeply committed to Cloud-based technologies, collaborating with leading providers such as Amazon Web Services (AWS), Microsoft Azure, and Google Cloud Platform (GCP). Proudly, we were the first AWS Premier Consulting Partner in Poland.As part of Xebia Group since 2021, we are a network of companies dedicated to making significant impacts in the tech landscape. Our culture promotes innovation, teamwork, and a commitment to excellence, allowing us to engage in groundbreaking projects worldwide.We believe in empowering our employees through knowledge and personal development, fostering an environment where every team member can thrive. We invite you to experience our unique culture firsthand!We look forward to learning more about you!Send us your resume and let’s start the conversation!

About Our Client Our client is a pioneering force in the realm of digital identity and fraud prevention, providing a state-of-the-art platform utilized by banks, fintech firms, online marketplaces, and various regulated entities globally. Their innovative solutions encompass biometric identity verification, document and image processing, and sophisticated fraud detection mechanisms, enabling customers to achieve seamless digital interactions while maintaining rigorous security and compliance with regulations. Leveraging cutting-edge technologies such as AI, machine learning, and computer vision, they facilitate identity verification, mobile deposits, and liveness detection, catering to thousands of organizations worldwide. About the Role We are in search of a Senior Full Stack Engineer who possesses a robust proficiency in backend services built with Go and modern web front-end frameworks. As a member of a dynamic cross-functional team, you will contribute to the development of cloud-native identity and fraud prevention products hosted on AWS. Your role will encompass designing and implementing APIs in Go, as well as crafting user-centric features using contemporary JavaScript frameworks, ensuring secure, high-performance experiences for both internal and external users. Key Responsibilities Design, develop, and maintain backend services and APIs in Go, leveraging AWS infrastructure with microservice or serverless architectures. Create responsive single-page and web applications utilizing React and Redux, seamlessly integrating them with backend APIs. Implement clean and reusable UI components, prioritizing user experience, performance, and accessibility. Develop and uphold automated testing protocols for both backend and frontend components, contributing to CI/CD automation processes. Collaborate closely with designers, product managers, QA, and fellow engineers to refine requirements and deliver comprehensive features. Engage in technical design and architecture discussions, aiding in the definition of interfaces between services and front-end applications. Contribute to the documentation of APIs, front-end components, and significant technical decisions. Participate in Agile ceremonies and proactively drive enhancements in team processes and engineering practices.

About UsBee Talents is a leading IT recruitment agency dedicated to connecting exceptional talent with innovative companies since 2015. Currently, we are thrilled to serve as the exclusive RPO provider for Gcore, and we invite you to explore an exciting opportunity to join their team as a Software Golang Engineer (Kubernetes).Company OverviewThis position is offered under an employment (labor) agreement.At Gcore, the infrastructure and software that power the world's digital experiences are our passion. We are a global leader in providing cutting-edge infrastructure and software solutions for AI, cloud, network, and security, enabling real-time communication, streaming, and secure web applications.Your contributions will help shape the future of AI-driven solutions, with access to over 210 edge locations, 50+ cloud regions, and thousands of GPUs, ensuring your work impacts users globally.Collaborating with top-tier technology partners like Intel, NVIDIA, Dell, and Equinix, you will play a crucial role in creating platforms that support digital products worldwide. Our mission is straightforward: to connect the world to AI, anytime, anywhere.Ready to work on transformative technology that transcends industries? Join our diverse team of over 550 professionals as we build the infrastructure and software that supports the entire digital ecosystem.We are seeking a talented Golang Engineer to develop Kubernetes-native AI infrastructure and tools designed for scalable inference and training workloads.

Role Overview Sigma Software Group is hiring a Middle Data Analyst in Warsaw. This role focuses on interpreting data, analyzing results, and delivering insights to support business decisions. Collaboration with stakeholders is central to the position, as is understanding their analytical needs and providing effective data-driven solutions.

Join SpotOn as a Senior Software Engineer II specializing in Golang within our dynamic order processing team. In this role, you'll leverage your expertise to design, develop, and optimize high-performance software solutions that enhance our order management systems. Collaborate with cross-functional teams to ensure seamless integration and delivery of top-notch services.

Join our dynamic team at Miratech as a Middle DevOps Engineer specializing in Azure. In this role, you will be pivotal in enhancing our cloud infrastructure, ensuring robust deployment processes, and promoting best practices in automation and monitoring. You will collaborate with cross-functional teams to optimize our operations and contribute to innovative solutions that drive our business forward.

Join Miratech as a Middle DevOps Engineer specializing in Azure, where you will play a pivotal role in enhancing our cloud infrastructure and streamlining our deployment processes. You will collaborate with cross-functional teams to implement best practices, automate workflows, and ensure high availability of services.

Jobgether is looking for a Middle+ Unity Developer to help build engaging poker games. This role is based in Poland and centers on developing high-quality gaming experiences using the Unity engine. Role overview As a Middle+ Unity Developer, the focus is on creating and improving poker games. Collaboration is key: work closely with designers and fellow developers to shape features and gameplay that keep players entertained. What you will do Develop and refine poker games using Unity Work with a team to deliver polished, enjoyable gaming experiences Contribute ideas to enhance game quality and player engagement Requirements Experience with Unity game development Interest in the poker industry or gaming sector Ability to collaborate with designers and developers

Join Miratech as a Middle DevOps Engineer specializing in Azure, where you will be an integral part of our engineering team. In this role, you will collaborate with cross-functional teams to design, implement, and maintain cloud infrastructure solutions that enhance our operational efficiency. Your expertise in Azure will be key in deploying scalable applications and ensuring high availability.