Role Description Appfire is looking for a Tech Lead - Fullstack Engineer to join the BigPicture team and help evolve a modern, cloud-based SaaS platform. You’ll lead the design of new functionality, optimize existing services, and support systems used by thousands of tenants. This role is heavily rooted in backend expertise, requiring a profound understanding of Java, Spring, and AWS / Cloud technologies. Additionally, the ideal candidate must have the willingness and capability to look after the frontend layer (TypeScript, Angular, or React), bridging the gap to deliver end-to-end solutions. You will be joining a mature engineering team working on BigPicture. Over the coming quarters, the team will be heavily focused on AI-driven initiatives, including areas such as AI chatbot capabilities, data quality improvements, and dynamic reporting. As a Tech Lead, you will also drive the adoption of modern AI-assisted development practices to boost team productivity. This role reports to the Engineering Manager and works cross-functionally with product, UX, and DevOps. What you’ll do: - Technical Leadership: Leading technical discussions, making architectural decisions and guiding a mature engineering team through upcoming AI-driven product initiatives. - Core Backend Development: Designing, implementing, and optimizing complex, scalable backend functionalities using Java, Spring, and AWS. - Frontend Feature Delivery: Taking ownership of the frontend layer using TypeScript and Angular or React to support fullstack product delivery. - AI Initiatives Execution: Leading the technical implementation of upcoming AI features, specifically focusing on AI chatbot capabilities, data quality improvements, and dynamic reporting. - AI-Assisted Development: Actively using and promoting modern AI developer tools (e.g., Cursor, Claude) to maximize efficiency and modernize engineering workflows. - Quality Assurance: Ensuring high code quality through rigorous testing (unit, integration, e2e), conducting peer code reviews, and solving performance-related challenges. - Collaboration: Partnering closely with Product Owners, UX/UI designers, and other engineering teams. Technical Highlights: - Add your value to a complex yet well-designed application (BigPicture), having over 100 modules and fully-fledged Domain-Driven Design (ubiquitous language, aggregates, domain events etc.). - Practice your craftsmanship in good design (clean code, SOLID, Inversion of Control) and in various architectures (hexagonal, event-driven, pipes&filters, modular monoliths, microservices and more). - Dive deep into a heavy backend stack built on Java and Spring, while utilizing AWS to scale our advanced cloud (SaaS) architecture serving thousands of tenants. - Work across the full stack by connecting robust backend services with modern frontend components using TypeScript, Angular, or React. - Build cutting-edge AI features, including AI chatbots, automated data quality systems, and dynamic reporting tools. - Supercharge your workflow using state-of-the-art AI tools like Cursor, GitHub Copilot, and modern LLMs for code generation, refactoring, and architectural brainstorming. - Thoroughly test what you build: with unit, integration and e2e tests (Spock, JUnit, Mockito, AssertJ, REST Assured, WireMock, Testcontainers, Cypress). - Feel safe with our extensive CI process that automatically runs unit, integration, e2e, architecture, migration and performance tests on your commit. Qualifications - Proven experience acting as a Tech Lead, driving technical direction, making architectural choices, and mentoring senior/mid-level engineers. - Deep, practical knowledge of Java, Spring, Hibernate, and SQL. - Strong understanding of SaaS architecture and extensive experience building/scaling applications within cloud environments, specifically AWS. - Good hands-on skills in TypeScript and modern frameworks (Angular or React) combined with a genuine willingness to develop fullstack features. - High comfort level working with AI technologies, proficiency with AI-assisted development practices (specifically Cursor, Copilot), and an interest or background in implementing AI features (e.g., LLM integration, data indexing). - A good understanding of SOLID principles and common design patterns to keep the codebase maintainable. - Proficiency in JUnit/Spock, Git, Maven, and Docker. - Experience in evolving and scaling established systems (beyond just greenfield projects) and a focus on long-term code maintainability. - Ability to use profiling tools and a focus on writing efficient code that performs well under load. Benefits - Contract of Employment (indefinite). - Every Appfire team member is eligible for company equity, fostering a true sense of ownership and connection to our growth. - 26 paid vacation days annually, regardless of tenure. - 12 Wellness Days (1 day per month, non-transferable). - 24 hours of paid volunteer time to engage in meaningful activities outside of work. - Fully covered Luxmed private healthcare plan, with options to extend coverage to your partner or opt for additional upgrades. - Life insurance provided by UNUM and fully paid by Appfire. - MyBenefit Platform - 150 PLN per month to spend on a Multisport card or on a variety of experiences such as shopping, restaurants, and entertainment. - Home Office Allowance - 200 PLN net per month added to your salary to support your electricity and internet costs while working remotely. - Lunch Card - 300 PLN monthly for groceries or dining out, available via a virtual pre-paid Pluxee card.