Senior Backend Developer

Location: Athens, Greece (preferred)Work Model: Remote first (6-week probation), then onsite in AthensStart Date: ImmediateDepartment: EngineeringReports to: Lead Developer & CTOAbout GTSSGTSS builds SaaS and digital platforms for the creator economy, including a marketing CRM used by global creators and agencies. With 7 products in our pipeline, we’re scaling engineering operations and building product-dedicated teams.Our culture is grounded in first-principles thinking, shipping fast, and iterating continuously.Role OverviewWe’re seeking a Senior Backend Developer to architect, scale, and optimize the backend infrastructure powering actual projects and future GTSS applications.This is a high-impact role for someone who owns API performance, database reliability, and microservice architecture.Key ResponsibilitiesBuild and maintain Node.js/Express APIs for high-traffic production systems.Architect scalable backend services and microservices.Optimize and maintain PostgreSQL databases.Ensure API reliability, security, and performance.Collaborate with Product and Frontend teams to deliver end-to-end features.Own CI/CD processes and infrastructure best practices.Required SkillsNode.jsExpressPostgreSQLTypeScriptAPI architecture & documentationGit workflowsCI/CD pipelinesPreferred Skills (Nice to Have)DockerAWS or DigitalOcean deploymentMicroservices architectureSocial media APIsReal-time data processingWhat We’re Looking For5–10 years of backend engineering experience.Bachelor's in Computer Science or equivalent advanced experience.Strong ownership mindset; thrives in high-velocity delivery.Based in Greece (Athens preferred) or able to work remote → onsite after probation.Why Join GTSSLead backend initiatives across multiple SaaS products.Build infrastructure from first principles in a scaling startup.Direct access to leadership and decision-making.Immediate impact on live users and customer operations.➡️ Apply now and lead the backend architecture powering the creator economy’s next generation of tools.Please mention the word **PRECIOUS** and tag RODguMTk4Ljk5LjE0Mw== when applying to show you read the job post completely (#RODguMTk4Ljk5LjE0Mw==). This is a beta feature to avoid spam applicants. Companies can search these words to find applicants that read this and see they're human.