Role Description We are hiring on behalf of our client in the high-growth Web3 and DeFi sector who is seeking a Senior Backend Engineer to join its core Platform team. This organization builds and evolves the distributed backend systems that power its primary products and customer-facing solutions. The successful candidate will design and operate complex systems, manage Web3 infrastructure, and collaborate closely with product and platform engineers to deliver reliable, scalable solutions. This role is ideal for an engineer who values strong ownership, thoughtful system design, and maintains a high bar for code quality. The client fosters an environment that prioritizes building solid systems and moving quickly without compromising standards, leveraging modern tools—including AI—to maximize efficiency. Key Responsibilities - System Architecture: Design, build, and maintain scalable distributed backend systems powering core platform and product capabilities. - End-to-End Ownership: Manage backend services throughout their entire lifecycle, from initial architecture and implementation to monitoring and long-term reliability. - Product Collaboration: Partner with product and engineering peers to actively shape product decisions and strategy rather than merely executing technical specifications. - Web3 Integration: Build and evolve platform backend components, including protocol integrations, support for emerging blockchain networks, and reliable interactions with smart contracts. - Engineering Standards: Ensure high standards of code quality, performance, security, and observability across all services. - Operational Excellence: Operate effectively in a fast-paced startup environment, balancing development velocity with technical correctness. - Innovation: Leverage AI-assisted tools to improve development velocity and personal productivity while contributing to technical discussions, reviews, and mentorship within the team. Qualifications - 5+ years of professional experience designing and building distributed backend systems. - A strong foundation in algorithms, data structures, and software design patterns. - Professional experience with Python 3. - Proven experience with containerized systems (Docker & Kubernetes), databases (Postgres/SQL, MongoDB, or Cassandra), and cloud environments (AWS). - Experience with observability tools such as Sentry, Prometheus, and Grafana. - Clear, proactive communication skills suited for a distributed, async-first team and a strong ownership mindset. - Hands-on experience with blockchain systems, dApps, or smart contracts is highly preferred. Bonus Qualifications - Knowledge of Golang. - Prior experience in a high-autonomy startup environment. - Location within time zones close to Europe (CET/EET). Benefits - A market-leading salary and stock options, allowing team members to contribute to and share in the organization’s long-term success. - Comprehensive medical insurance and a flexible work schedule. - Full support for remote work, including necessary software, equipment, and coworking memberships. - An unlimited days-off policy to ensure a healthy work-life balance and time to recharge. - Opportunities for relocation support and travel to industry festivals and global events. - A fully distributed, remote team environment composed of driven and intelligent individuals in the crypto and technology space. Interview Process - Initial Talent Screening: A conversation with the recruitment team to assess general alignment, communication skills, and Web3 interest. - Hiring Manager Interview: An in-depth discussion focused on seniority, technical judgment, problem-solving under ambiguity, and alignment with a fast-paced startup mindset. - Technical Assessment: A 60-minute technical interview focusing on core engineering competencies. - Systems Design: A 90-minute deep dive into architectural thinking and distributed systems design. - Team Panel: A group interview with potential peers to assess cultural fit and collaborative approach. - Executive Discussion: A final conversation with the Founders/CEO. Commitment to Equality and Accessibility At MLabs, we are committed to offer equal opportunities to all candidates. We ensure no discrimination, accessible job adverts, and providing information in accessible formats. Our goal is to foster a diverse, inclusive workplace with equal opportunities for all. If you need any reasonable adjustments during any part of the hiring process or you would like to see the job-advert in an accessible format please let us know at the earliest opportunity by emailing human-resources@mlabs.city.

• You will work as a Senior Java Software Engineer in consulting on interesting and challenging client projects • You will develop and take ownership of Java-based applications with Spring Boot, from architecture through to production operation • You will work with modern, clearly structured architectures • You are hands-on in the code and take responsibility for quality, maintainability, and stability • You will actively contribute to technical decisions and explain them clearly — internally and to clients • You will be deployed independently or together with colleagues on client projects and serve as a competent point of contact • You will work closely with other consultants, developers, and architects • Depending on the project, you may occasionally be on-site at the client; the majority of work is remote

• Develop and enhance a complex B2B portal in the insurance domain • Implement requirements in the frontend (Apache Wicket) and backend (Spring, Hibernate) • Integrate messaging components using JMS • Data modeling and access using MS SQL • Close collaboration with Product Owners, QA and DevOps in an agile environment (Scrum/Kanban) • Contribute to architectural decisions and technical evolution • Use and evaluate AI-assisted tools for code generation or test automation • Focus on software quality through automated testing and/or security reviews

Execute subsurface exploration and in-situ testing for foundation projects, perform field construction observation, evaluate data through engineering analyses, and write technical documents to ensure compliance and effective communication with...