Senior Backend Engineer - Typescript
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Key skills for this role
About the Role
Salla is looking for a Senior Backend Engineer to join their AI team, focusing on building integration and infrastructure layers for AI capabilities. The role involves designing SDKs, backend services, and a rule engine for integrity systems.
Key Skills for This Role
Responsibilities
- Design, implement, and maintain AI focused SDKs that enable seamless communication between AI services and application layers
- Build backend services and integrations that make AI capabilities consumable across Salla's products and teams
- Develop and maintain API integrations and Model Context Protocol (MCP) servers that allow AI agents to interact with internal systems
- Design and own a versioned rule/policy engine and the supporting business logic for Salla's integrity systems
- Model the decision records, state transitions, and audit trails that keep integrity outcomes explainable and reversible
- Partner with the integrity/ML lead to consume risk scoring outputs, and with product teams to define enforcement action contracts
- Ensure type safe, scalable, and high performance TypeScript code, following backend best practices
- Collaborate closely 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
Requirements
- 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), including query optimization
- Strong knowledge of software design principles (SOLID, clean architecture, design patterns)
- Experience working with Git in structured team workflows
- Hands on experience with unit testing and integration testing
- Good understanding of how frontend applications consume backend services
Full Job Posting
Role Overview
- Salla is looking for a Senior Backend Engineer to join our AI team.
- This role focuses on building the integration and infrastructure layer that connects our AI capabilities to production systems.
- You will be responsible for enabling AI features to operate reliably, securely, and at scale across the Salla ecosystem.
- Alongside this, you'll contribute to our integrity systems by owning the rule engine and business logic that turn risk signals into auditable enforcement decisions.
Key Responsibilities
- Design, implement, and maintain AI focused SDKs that enable seamless communication between AI services and application layers
- Build backend services and integrations that make AI capabilities consumable across Salla's products and teams
- Develop and maintain API integrations and Model Context Protocol (MCP) servers that allow AI agents to interact with internal systems, external tools, and databases
- Design and own a versioned rule/policy engine and the supporting business logic for Salla's integrity systems — translating risk signals and model scores into auditable decisions (state → policy → action), with enforcement/actuation owned by the product team
- Model the decision records, state transitions, and audit trails that keep integrity outcomes explainable and reversible (appeals, overrides)
- Partner with the integrity/ML lead to consume risk scoring outputs, and with product teams to define the enforcement action contracts the engine emits against
- Ensure type safe, scalable, and high performance TypeScript code, following backend best practices
- Collaborate closely with frontend engineers to define AI data contracts, schemas, and interfaces
- Collaborate with frontend teams on integration contracts for AI powered features when needed
- 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 across AI and integrity services
- Participate in architecture discussions, code reviews, and technical decision making
Requirements
- 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), including query optimization
- Strong knowledge of software design principles (SOLID, clean architecture, design patterns)
- Experience working with Git in structured team workflows (e.g., Git Flow, PR based development)
- Hands on experience with unit testing and integration testing
- Good understanding of how frontend applications consume backend services, including modern JavaScript (ES6+)
Nice to have
- Familiarity with AI systems, including Agentic AI, LLM orchestration, or streaming AI responses
- Experience building or integrating AI powered features into production applications
- Experience designing rules engines, policy as code, state machines, or complex stateful business logic (bonus: OPA/Rego or versioned decisioning)
- Strong domain and data modeling for correctness and audit critical systems
- Hands on experience with modern frontend frameworks (React, Vue, or similar)
- Exposure to cloud and DevOps tooling such as Docker, Kubernetes, AWS, or CI/CD pipelines
- Experience working in cross functional product teams involving AI, backend, and frontend engineers
- Bonus: trust & safety, fraud, risk, or marketplace integrity exposure
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