•You will have an enormous impact on making our app and API service faster, more scalable and more flexible. •You will collaborate with product and engineering teams to ship AI-powered features and make the existing ones perform orders of magnitude faster. •Real-time messaging to support 500,000 concurrent users per customer application; •High performance: our API responses are in the 10ms range; •Design and build AI Agents, RAG pipelines, model fine-tuning and crawling. •High scalability: we use sharding, master-master, and master-slave to ensure scalability; •High availability: our code is running on homepages of the most visited websites and apps on the internet; •Distributed databases for our Data Platform storing every user engagement.

• Architect low-latency Python services supporting core search • Optimize indexing and ranking pipelines • Improve query response times at scale • Design concurrency strategies for performance-critical systems • Influence system-level architectural decisions • Mentor senior engineers and elevate technical standards • Bridge ML-driven ranking systems with production-grade infrastructure

• FocusReactive is a modern consultancy company with deep specialization in our core development stack. • It is not a traditional outsourcing company, therefore we expect each engineer to integrate well into clients product delivery and design process, driving key decision-making. • You will regularly embed with client teams, either in person or remotely, to provide project leadership and technical expertise. • When you’re not working on client projects, you’ll have a chance to contribute to our community-leading open source software and polish your presentation skills at our tech events.

• Provide hands-on mentorship while contributing to a Flask web application • Clearly explain fundamental coding concepts over screenshares and video chats • Describe line by line how to build certain features • Troubleshoot bugs and other errors that come up along the way