Software Engineer (Backend, TypeScript & AWS Serverless)

About the role

Levi9 is a team of experts delivering cloud-native solutions for clients from startups to global enterprises, using modern JavaScript and TypeScript, AWS, GCP and Azure, often with serverless architectures. It is looking for an experienced software engineer in Belgrade who owns products end to end, from architecture and design through implementation, release, monitoring and scaling. The core focus is backend development in TypeScript on AWS serverless, with AI agents used every day.

Key responsibilities

• Design, build and maintain production-grade, event-driven services on AWS (Lambda, API Gateway, Step Functions, EventBridge, SQS, DynamoDB, Aurora PostgreSQL)
• Own features end to end, from refinement and architecture through testing, release and post-release monitoring
• Define infrastructure in AWS CDK (TypeScript) and build and maintain CI/CD pipelines that test, scan and deploy across environments
• Use AI coding agents daily across the SDLC, write and refine specifications (PRDs, functional designs) and review the code they produce
• Build and improve the team's AI setup (shared context, subagents, MCP tools) and add guardrails such as tests, quality gates and verification steps
• Build domain APIs and workflows that AI agents can use safely, and write unit, integration and end-to-end tests
• Work with project managers, POs, analysts, QA and DevOps engineers, and support operational excellence through code review and pair programming
• Mentor less experienced developers and keep up with AI engineering practices

Required profile

• 5+ years of experience in the software development lifecycle, including coding standards, code reviews, source control, build processes, testing and operations
• Commercial experience building backend services in TypeScript and Node.js in production
• Hands-on experience with AWS serverless services and infrastructure as code, preferably AWS CDK in TypeScript
• Real experience with AI coding tools such as Claude Code, Cursor or GitHub Copilot, and an understanding of AI SDLC practices
• A critical mindset toward AI, validating its work before it ships
• Good written and spoken English

Required skills

• CI/CD pipelines (GitHub Actions, Concourse, GitLab CI, Jenkins or similar) with automated tests, security scans and deployments
• RESTful APIs and event-driven architectures; testing with Jest, Vitest or similar
• SQL and NoSQL databases (PostgreSQL, DynamoDB); logging, monitoring and observability (Datadog, CloudWatch)
• Git, OOP concepts, troubleshooting across services and environments
• Nice to have: Amazon Bedrock Agent Core, LLM APIs, RAG, agent frameworks, workflow orchestration, regulated environments, AWS certifications