Senior Backend Software Engineer

About Genesy AI Genesy AI is a Barcelona-based startup on a mission to revolutionize how B2B sales and prospecting teams operate. Our cutting-edge AI-driven lead generation technology empowers sales teams to focus on what truly matters: selling. By automating manual prospecting, we help optimize workflows, ensuring a predictable and scalable sales pipeline—no wasted time, just results. After successfully raising €5 million in a landmark seed funding round, we are looking to grow our teams and scale in key markets. We are now looking for a Senior Backend Software Engineer to join us. What You'll Do You will help us build and maintain scalable, reliable backend services that power Genesy AI's sales automation engine. This includes core systems around lead processing, workflow orchestration (via Temporal), integrations with third-party platforms (e.g., CRMs, LinkedIn), data pipelines, and internal APIs. You will work closely with Product and Frontend teams to deliver end-to-end functionality, with a strong emphasis on reliability, performance, and observability. What We're Looking For Must-have: 3+ years of experience in Backend development (preferably in / TypeScript). Experience designing and building production-grade APIs and services. Experience with PostgreSQL or other relational databases. Solid understanding of event-driven architectures and asynchronous processing. Experience working with Temporal or similar workflow engines (or, at a minimum, proven ability to learn complex async systems quickly). Strong debugging and performance optimization skills. Clear communication and ability to work autonomously in a fast-paced startup environment. Writing clean, testable, well-documented code. Advanced level of English.  Barcelona-based or open to relocating to our vibrant city. Nice-to-have Prior experience in early-stage startups or fast-scaling environments. Familiarity with microservices and distributed systems patterns. Experience with Redis, Elasticsearch, Kafka, or similar tooling. CI/CD experience using GitHub Actions. Familiarity with DDD (Domain Driven Design) or Hexagonal Architecture. Exposure to frontend frameworks (React) or full-stack development, even if light. Interest in B2B SaaS, sales tech, or automation tools. Experience working with third-party APIs at scale (e.g., LinkedIn, HubSpot, Salesforce). What We Offer Competitive salary tailored to your experience. Enticing performance bonuses that you won't see anywhere else. Flexible remuneration through Cobee. Short Fridays all year round and extra days of vacation for your birthday and Geneversary. Working remotely for two weeks in August from anywhere in the world. A discount on a premium gym (with spa access) just a step away. Free fresh fruit every day to help you care for your health. Free coffee to keep you energized. A discount at a beachfront cafe where you can also get daily menu deals. Beachfront office so you can work with stunning sea views—an inspiring and energizing workspace. Direct beach access to take breaks by the sea and recharge. Continuous learning, including but not limited to mentoring, coaching, workshops, and opportunities to attend SaaS conferences. Career growth opportunities, as we won't let your dedication and results go unnoticed. Team gatherings and celebrations, because we love to build connections and celebrate achievements together. A collaborative culture because we foster hard work, teamwork, transparency, and respect, encouraging open communication and a positive environment where your voice matters. Ready to shape the future of B2B sales with us? Let's build something great together