**Want to Make Waves in Tech? GBT Solutions Is the Place to Be!🐝About Us:** At GBT Solutions, a leading Portuguese technology company with over 28 years of experience, we excel in delivering cutting-edge solutions across various industries. We are dedicated to fostering a diverse and inclusive work environment and are proud to be recognized for our commitment to excellence and innovation.

**Position:** Fullstack Java Developer

**Location:** Full Remote

**Language:** Portuguese | English

**What We’re Looking For:**

*   Higher education or attendance in computer engineering, management information technology, data science and statistics, mathematics, computer science or similar.
*   Experience: Minimum 3 years in software development.
*   Languages Backend: Minimum 3 years in Java 8 (or higher).
*   Languages Frontend: Minimum 3 years in react or angular.

**Nice to have:**

*   Tools: Minimum 2 years with Git, Docker.
*   Methodologies: Minimum 2 years in Agile.

**Equal Opportunity:** GBT Solutions is an equal opportunity employer and values diversity. We do not discriminate based on age, ethnicity, sexual orientation, gender, disability, or any other factor other than merit.

Fullstack Java Developer

YOUR MISSION We are looking for a highly-skilled **Senior Frontend Engineer** to join one of our development teams. In this role, you will be responsible for developing and implementing user interface components using React.js with technologies such as TypeScript, GraphQL, Jest, Cypress and Vite, as we build the future of AI-powered digital advertising. You will also be responsible for testing, profiling and improving front-end performance and documenting our front-end codebase, and mentoring your team-mates, planning tasks and estimating workloads. You'll be working within a cross-disciplinary team under the Engineering Manager to contribute to our multi-tenant SaaS product. This is a high-impact role for someone who thrives on elevating engineering standards, and driving a forward-thinking, **AI-first** approach across the organization. To ensure success as a senior frontend engineer, you should have in-depth knowledge of React concepts, excellent front-end coding skills, and a great understanding of progressive web applications. Ultimately, a top-class Senior Frontend Engineer should be able to design, plan and build modern user interface components to enhance application performance and coach other team-mates to achieve the same. YOUR PROFILE

*   6+ years of professional experience in similar position
*   Proven expert knowledge of TypeScript, JavaScript, CSS, HTML and front-end languages
*   Quality-focused mindset and deep passion for user experience and user interfaces
*   AI-first mindset, embedding AI and automation into product architecture, engineering workflows, and decision-making processes
*   Great knowledge of common frontend tools including React.js, Vite, Jest and Cypress.js
*   Great experience with browser-based debugging and performance testing software
*   Excellent familiarity with git, npm, docker and Jira
*   Great Troubleshooting skills
*   Good project management skills
*   Extensive experience in mentoring teammates in a respectful, empathic manner

**Requirements** YOUR RESPONSIBILITIES

*   Meeting with the development team to discuss user interface ideas and applications
*   Reviewing application requirements and interface designs
*   Identifying web-based user interactions
*   Developing and implementing highly responsive user interface components using react concepts
*   Writing application interface codes using TypeScript following react.js workflows
*   Troubleshooting interface software and debugging application codes
*   Developing and implementing front-end architecture to support user interface concepts
*   Provide automated unit, e2e and visual regression tests
*   Monitoring and improving front-end performance
*   Documenting application changes and developing updates
*   Participate in code and technical design reviews
*   Write and review tasks and estimate workloads for yourself and others
*   Provide mentorship to team-members

**Benefits** WHY US? Factor Eleven's tech department is an inhouse tech start-up/scale-up and responsible for our saas product suite offering localized digital advertising to enterprises of all sizes and shapes. We're powering the engine that Factor Eleven is successfully built upon and elevate the possibilities of our product on a daily basis. We're fulfilling our ambitions as a top ad-tech provider by continuously leveling up the quality and expanding capabilities of the entire platform, as well as our engineering and product organization. Join our amazing team in our mission to move digital localized advertisement forward and enjoy the freedom, camaraderie and perks of our fully remote operations. **Our Perks & Benefits**

*   Transparent, above-market salaries
*   100%-remote within Europe
*   Clear expectations and regular feedback
*   Flexible work-hours and part-time models
*   Be part of a fast-growing, highly-skilled Team
*   Relocation and visa support
*   In person department and company events
*   Home office, co-working space and work-together allowance
*   Personal and professional development fund

Senior Frontend Engineer - React.JS (Europe, f/m/d)

At Blazity, we are a team of React.js and Next.js experts focused on creating API-first products. We build long-term partnerships with our clients, serving as their trusted development partners. Our work involves optimizing apps, stores, and websites, implementing new features, and automating workflows to deliver outstanding results. Looking for your next adventure? As it’s often said, you must gather your party before venturing forth – why not join ours? 😊 We’re looking for a Mobile & Web Developer for a unique, cross-platform role combining mobile and web development. If you enjoy working across Android, iOS, and frontend web technologies and you're not afraid to switch contexts, this might be the perfect opportunity for you. **Our Requirements**

*   Proven experience in mobile SDK development for iOS and Android.
*   Expertise in Java (for Android) and Swift (for iOS).
*   Experience with Typescript and React.js for web development.
*   Hands-on experience working with existing, legacy codebases.
*   Strong background in SDK development and customer support.

**Scope Of Responsibilities** Mobile (30-40%):

*   Maintaining and supporting existing mobile SDKs (iOS and Android).
*   Working with Java (Android SDK) and Swift (iOS SDK).
*   Working on push notification infrastructure

Web (60-70%):

*   Developing new features and functionalities in React.js.
*   Implementing and optimizing web applications.

**What We OfferWe may not have fruit Thursdays or online meditation sessions, but you might appreciate:**

*   29 paid days off
*   Health insurance fully covered by us
*   Sports card fully covered by us

**What Makes Us Special?** 📈 Our team has a genuine impact on the company’s decisions and direction. ✨ No bureaucracy – we keep things simple and efficient. 🗺️ Remote work from Poland ⏳ Flexible working hours – fit your schedule to your life. 🍕 Fun social events to connect with your teammates. 🤝 We value feedback and foster an open, supportive environment. **Salary ranges** B2B: 90 - 145 PLN/h **Location** 100% remote from Poland

Mobile & Web Developer

Your mission

At Circunomics, we are transforming the circular economy with groundbreaking solutions for the lifecycle management of batteries. As a dynamic startup leading the charge in green technology and sustainability, we harness the power of cutting-edge software and data-driven insights to optimize efficiency, minimize waste, and make a meaningful impact on the environment. Join our dedicated team of innovators as we pave the way for the future of battery technology and drive the global transition toward a sustainable energy future.

CX-Video 2023 — https://youtu.be/ZrFiz-M0Xrc ; Product Video 2023 — https://youtu.be/OGpx4Wkmetw ;

Your profile

*   Develop and maintain a state-of-the-art analytics based Lifecycle Management platform and marketplace using Angular
*   Visualize complex battery data and usage KPIs using Frameworks like e.g. ECharts, D3, Chart or Recharts
*   Continuously leverage, maintain and extend our Component Library (Storybook)
*   Implement GDPR-compliant security and optimize performance using smart caching
*   Contribute to architectural decisions and component design strategy
*   Work in an agile interdisciplinary team with our product managers, UX designers, and collaborate closely with the backend team to integrate REST APIs
*   Develop and integrate E2E tests according to test definitions
*   Provide a robust application with high-test coverage (unit tests)
*   Continuously maintain and sustain technical documentation

You have

*   Degree in computer science or a similar technical field
*   3+ years of architecting and implementing scalable, multi-component User Interface
*   Proficiency in key web technologies to create responsive, accessible UIs using JavaScript, TypeScript, HTML, CSS/SASS
*   Strong knowledge with Angular 17+ and charting frameworks
*   Proficient in component-based architecture, state management, and building reusable UI components.
*   Skilled in frontend quality tooling e.g. ES Lint, Prettier or Huskey as well with testing and automation e.g Jasmine or Karma
*   Solid understanding of RESTful API design and implementation
*   Familiar with CI/CD pipelines using GitHub Actions
*   Great Communication Skills
*   Experience working as part of a remote team, sharing ideas, and presenting concepts effectively
*   Motivated and proactive attitude about improving the work
*   Experience with software releases
*   Good command of English it’s a must , and German is a plus

Bonus points for

*   AWS Certifications
*   Experience with backend technologies (PHP, Node.js) and IaaS
*   Ability to implement UX analytics to analyse user activity on a website or app that provides insights into how its design can be adapted to meet the current or changing needs of end users

Why us?

*   Flexible Working Hours: Embrace a healthy work-life balance with our autonomous scheduling that lets you manage your day effectively.
*   €50 Monthly Perks: Receive a monthly stipend to use on wellness, dining, or other benefits that suit your lifestyle.
*   28 Holiday Days + Public Holidays: Enjoy generous time off, including the ability to carry over days or earn extra days for milestones.
*   Dedicated L&D Budget: Invest in your growth with a budget covering professional certifications, conferences, and personal development opportunities.
*   Hybrid Work Options: Work from home part-time or full-time, with flexibility around core hours to suit your needs.
*   Flat Hierarchies: Experience open communication and collaborative decision-making in our innovative environment.
*   Career Growth & Mentorship: Advance your career with creative freedom, mentorship programs, and clear leadership opportunities.

About Us

Circunomics GmbH, based in Mainz, Germany was founded in 2019. Circunomics is leading the industry by offering a comprehensive battery lifecycle management solution. Co-Founders, Felix Wagner and Jan Born, are dedicated to establishing a true circular battery economy, which in turn, maximizes each stage of battery life. Along with their team, they seek to inspire the movement of batteries from the automotive industry, to the energy sector, and finally on to recyclers who close the loop by recovering any remaining raw materials.

Circunomics has developed an AI-powered, B2B marketplace where cells, modules, and packs can be sold and purchased. Through the Circunomics Analytics product, sellers and buyers alike can obtain a detailed view of their assets. From current SoH to 2nd-life simulation, this product allows for a simpler and more profitable lifecycle management. Circunomics knows that lifecycle planning is complex, and the Battery Matchmakers are on a mission to help ease this process for their customers.

The company has been supported thus far by seed investors and business angels. Startup builder Next Mobility Labs, recycler TES, Orlen VC, and Dr. Peter Mertens (former Chief Technology Officer of Audi) are some of the key players. The Series A funding round was completed in December of 2024 with the addition of investors, Schaeffler and GET Fund.

Official expansion into the US Market transpired in January of 2025 with the hiring of Adam Willmouth who will serve as the company's US Managing Director. Circunomics looks forward to further collaboration with current US clients and to further growth within this key global market.

**Top Awards Received:** \- US-based company Frost & Sullivan awarded Circunomics the 2023 Market Leadership Award. This award identified Circunomics as the Best in Class within the European Circular Marketplace for the Battery Trade Industry. 2023 Market Leadership Award Exposé by Frost & Sullivan - Automobilewoche and McKinsey & Co. awarded Circunomics 2nd Best StartUp within the automotive industry for 2023 - Motor Presse Stuttgart, with its leading automotive trade magazine, auto motor und sport, and the HUK-Coburg insurance group awarded Circunomics the Safety & Environment Award for 2024. For more info here.

**Top Publications and Podcasts:** \- Auto motor und sport podcast - Spotify Episode - E world essen - Easy engineering - most advanced digital life cycle

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