• Improve and standardize tracking events across product ecosystem. • Investigate where particular events are generated and identify the relevant projects, repositories and system owners. • Design and implement backend and API changes using Java and Kotlin. • Integrate behavioural data with Segment and the wider data ecosystem. • Make necessary adjustments in the React-based web application when required. • Raise technical risks, clarify dependencies and involve other developers when a change requires broader coordination. • Move between different repositories and systems while taking ownership of each topic from discovery to delivery.

Role Description We’re hiring a Lead Symfony & PHP Software Engineer to help design, build, and maintain the core backend systems of our products. You’ll work as part of an Agile team, collaborating with product managers, designers, and other engineers to build scalable, reliable features that solve real-world problems. This role is perfect for someone who enjoys clean code, leading technical discussions, mentoring others, and shipping tested solutions that meet business needs. - Develop backend features that align with business goals and customer needs - Maintain and improve test coverage using PHPUnit - Build scalable, testable APIs and backend systems - Write clean, maintainable code that meets agreed quality standards - Review requirements and provide technical input and feedback - Collaborate closely with product, design, and QA teams - Monitor systems and respond to issues as part of a rotating on-call schedule - Break down larger projects into manageable tasks and guide others through implementation - Participate in code reviews and offer constructive feedback - Continuously improve processes and suggest technical enhancements - Secure coding practices and ensure code is free of known vulnerabilities - Document features, processes, and architecture for team-wide knowledge sharing Qualifications - 5+ years of experience working with PHP - 3+ years of hands-on experience with Symfony - 2+ years writing unit tests with PHPUnit - Excellent communication skills in cross-functional teams - Strong experience with MongoDB - Strong experience with Design Patterns (Object Oriented) Requirements - Familiarity with JavaScript, React, Node.js, and/or TypeScript - Experience with Docker and/or Kubernetes - Familiarity with CI/CD pipeline workflows Benefits - Fixed Shifts: 11:30 AM - 9:00 PM PKT (Summer) | 12:30 PM - 10:00 PM PKT (Winter) - No Weekend Work: Real work-life balance, not just words - Day 1 Benefits: Laptop and assets provided - Support That Matters: Mentorship, community, and forums where ideas are shared - True Belonging: A long-term career where your contributions are valued

Role Description We are hiring on behalf of our client, a fast-paced, dynamic, and fully remote team in the decentralized finance (DeFi) and Web3 space who is seeking an experienced Senior Backend Engineer. The employer operates with an ambitious roadmap and a strong commitment to engineering rigor, high-grade security, and rapid execution. As a Senior Backend Engineer, the selected candidate will play a critical role in designing, developing, and maintaining robust, high-throughput, and scalable backend systems. This role extends beyond writing code to architecting resilient, secure systems optimized for low-latency, real-time processing in financial services. Key Responsibilities - Backend Development: - Design, develop, and maintain core backend systems powering high-throughput trading, exchange, and network infrastructure using clean, efficient, and maintainable code. - Index on-chain data into event queues and persistence layers to serve WebSockets and scalable APIs consumed by user interfaces and risk dashboards. - System Architecture: - Define the high-level backend structure, data flow, and interactions between components, focusing on event-driven architecture and messaging patterns common in financial systems. - Reliability, Performance & Availability: - Ensure architectural designs meet strict performance, high availability, and reliability standards. - Implement failover mechanisms, redundancy strategies, and disaster recovery plans to minimize potential downtime. - Security: - Implement and maintain robust security measures to protect backend infrastructure and APIs against DDoS attacks, data breaches, injection vulnerabilities, and other threat vectors. - Data Storage Strategy: - Define data storage strategies and select appropriate databases and models tailored for financial applications. - Evaluate trade-offs across relational databases, key-value stores, and messaging queues. - Testing Strategy: - Develop and execute a comprehensive testing strategy covering unit, integration, security, load, and performance testing. - Collaborate with the broader engineering team to establish test reporting and maintain standardized testing processes. - Technological Evaluation & Documentation: - Stay informed on emerging backend technologies, evaluating new tools, frameworks, and methodologies to elevate system performance and scalability. - Document architectural designs clearly for both technical team members and non-technical stakeholders. - Code Review & Team Collaboration: - Participate in code reviews, mentor engineering team members, and enforce coding standards and best practices. - Collaborate closely with cross-functional teams, including on-chain engineers, frontend developers, product managers, quantitative specialists, and executive leadership. Qualifications - Experience: 8+ years of backend engineering experience within the financial services industry. - Core Languages: 6+ years of hands-on experience using Rust or C++ to build highly scalable web services. - Concurrency: Mastery of asynchronous programming and advanced concurrency patterns, with an emphasis on thread safety and lock-free data structures. - Databases: 6+ years of experience designing and maintaining relational databases (e.g., PostgreSQL). - Messaging & Caching: 4+ years of experience with low-latency persistence and messaging technologies (e.g., Kafka, Redis, RabbitMQ). - High Availability: Proven track record of building and maintaining high-availability systems managing significant transaction volumes. - Security: Strong proficiency in securing and hardening backend systems and APIs against evolving security threats. - Testing & Cloud: Strong knowledge of software testing methodologies alongside experience with cloud platforms (AWS, GCP, or Azure) and containerization tools (Docker, Kubernetes). - Communication: Excellent verbal and written communication skills with the ability to work effectively in a collaborative, remote environment. Preferred Qualifications - Experience with low-level network programming, including asynchronous I/O, direct socket programming, and Linux kernel optimizations (e.g., epoll, zero-copy, or kernel bypass techniques). - Hands-on experience fine-tuning latency-sensitive components in trading systems, such as order-matching engines and risk engines. - Familiarity with blockchain technology, smart contracts, and decentralized systems. - Fundamental understanding of finance and derivatives trading. Ideal Profile Fit - Comfort operating within a compact, agile team navigating complexity, unknowns, and technical ambiguity. - Enthusiasm for rapid prototyping, iterative development, and building the future of financial technology. Work Setup - 100% remote working environment. - High-impact technical ownership within a cutting-edge DeFi/Web3 ecosystem. - Collaborative, performance-driven culture with high standards for engineering excellence. 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. MLabs Ltd collects and processes the personal information you provide such as your contact details, work history, resume, and other relevant data for recruitment purposes only. This information is managed securely in accordance with MLabs Ltd’s Privacy Policy and Information Security Policy, and in compliance with applicable data protection laws. Your data may be shared only with clients and trusted partners where necessary for recruitment purposes. You may request the deletion of your data or withdraw your consent at any time by contacting legal@mlabs.city.

• Design, build, secure, and maintain core platform for access management • Share operational ownership of the product • Participate in rotational on-call support schedule • Collaborate with other engineers to deliver user stories • Develop automated tests and improve continuous integration operations