Senior Backend Engineer - Typescript

About the role

Salla is seeking a Senior Backend Engineer to join its AI team. You will build the integration and infrastructure layer that connects AI capabilities to production systems, ensuring reliability, security, and scalability across the Salla ecosystem.

Key responsibilities

• Design, implement, and maintain AI‑focused SDKs for seamless communication between AI services and application layers.
• Build backend services and integrations that make AI capabilities consumable across Salla’s products.
• Develop and maintain API integrations and Model Context Protocol (MCP) servers for AI agents to interact with internal systems, external tools, and databases.
• Own a versioned rule/policy engine and business logic for integrity systems, translating risk signals into auditable enforcement decisions.
• Model decision records, state transitions, and audit trails to keep integrity outcomes explainable and reversible.
• Collaborate with frontend engineers to define AI data contracts, schemas, and interfaces.
• Optimize AI‑related data flows, including streaming responses and real‑time interactions.
• Mentor mid‑ and junior‑level engineers and uphold strong engineering and testing standards.
• Participate in architecture discussions, code reviews, and technical decision‑making.

Required profile

• 4+ years of backend development experience with a strong focus on TypeScript and Node.js.
• Proven experience designing and maintaining RESTful APIs and third‑party integrations.
• Solid understanding of relational databases (PostgreSQL or MySQL) and query optimization.
• Strong knowledge of software design principles (SOLID, clean architecture, design patterns).
• Experience with Git workflows (Git Flow, PR‑based development) and automated testing.
• Good understanding of how modern frontend applications consume backend services.

Required skills

• TypeScript
• Node.js
• RESTful API design
• PostgreSQL
• MySQL
• Git
• Unit testing
• Integration testing
• ES6+ JavaScript
• Software design principles (SOLID, clean architecture, design patterns)