Job Title

About Blkbox.ai:Blkbox.ai is revolutionizing digital advertising by leveraging AI-driven automation, helping brands launch, optimize, and scale high-performance campaigns. Our backend powers advanced machine learning models and cloud-native architectures, delivering cutting-edge solutions in the digital ad space.We are looking for a highly passionate Senior Backend Engineer (SDE-3) who brings deep experience in Node.js, NestJS, and microservices and can lead complex backend initiative and who is a proactive thinker, a fast learner, and a problem solver—someone who thrives in a high-speed startup environment and is eager to make an immediate, measurable impact.This role is not just about execution—it’s about owning problems, deeply understanding business challenges, and architecting scalable solutions that drive real-world impact. If you are self-driven, eager to grow, thrive on solving complex business and engineering problems, and can deliver measurable results quickly, this is the perfect opportunity. Key Responsibilities:Design and develop high-performance backend systems using Node.js and NestJS.Implement and optimize REST APIs, GraphQL, and event-driven architecturesOptimize & write complex SQL queries and database performance (PostgreSQL/MySQL) for scalability and efficiency.Design and implement microservices architectures that power AI-driven automation at scale.Deploy and manage cloud infrastructure (AWS, Azure, GCP), ensuring high availability, security, and cost efficiency.Work in a fast-paced environment, rapidly delivering and iterating on backend solutions with minimal guidance.Quickly learn and adapt to new technologies, optimizing systems for performance, reliability, and scalability.Mentor junior engineers and contribute to a strong engineering cultureEnsure best practices around testing, security, observability, and code qualityCollaborate closely with cross-functional teams to build seamless, business-driven solutions.Requirements:Passionate about backend engineering as well as deeply understanding business challenges, eager to solve complex technical and business problems.Minimum of 5 years of experience in backend development within a fast-paced, scaled startup environment.Proven expertise in Node.js and Nest.jsStrong knowledge of relational databases (PostgreSQL/MySQL) with experience writing and optimizing complex queries.Proven track record of working with AWS and GCP cloud services (ECS, Lambda, Cloud Functions, etc.)Solid understanding of microservices, distributed systems, CI/CD pipelines and containerization (Docker, Kubernetes).Proactive mindset -  Take ownership, solve problems independently, and don’t wait for instructions.Fast learner with a hunger to grow—eager to pick up new technologies and apply them effectively.Excellent problem-solving and communication skills—able to articulate technical solutions and collaborate with teams.Strong system design and debugging skillsBonus Points If You Have:Experience with Redis, Kafka, RabbitMQ for caching and messaging.Prior experience working on AI-driven applications or AdTech platforms.Entrepreneurial experience or having built something from scratch (startup, project, or product) is highly valued.Why Join Us?High-impact role—your work will shape our AI-powered automation solutions.Work in a fast-growing AI-first startup where speed and innovation are key.Grow quickly in a culture that values thinkers, problem-solvers, and independent doers.Rapid career growth with exposure to cutting-edge technologies and real-world AI applications.