This job is no longer available
This job expired on 12/07/2026. It no longer accepts applications.
Backend & AI Application Engineer
Fleekbiz Pakistan · Division de Karachi
Job description
About the role
We are seeking a Backend & AI Application Engineer to design, build and operate scalable backend services enriched with AI capabilities. The role focuses on delivering high-performance, secure APIs and integrating cutting-edge machine-learning models into production-grade applications.
Key responsibilities
- Design and implement RESTful APIs with versioning, pagination, error handling and security (OAuth2, JWT).
- Collaborate with frontend teams on API contracts, mock servers and integration patterns.
- Research, prototype and integrate AI/ML models and third-party services such as OpenAI, LLMs, embeddings, and retrieval-augmented generation pipelines.
- Build semantic search, vector stores and multi-agent workflows using LangChain, LangGraph, LlamaIndex and Weaviate.
- Write and maintain unit and integration tests, apply TDD and conduct root‑cause analysis for production issues.
- Optimize API response times, database queries and AI pipelines; implement logging, metrics, tracing and alerts.
- Maintain OpenAPI/Swagger documentation, Postman collections and internal service guides.
- Work with DevOps on containerization, orchestration and CI/CD pipelines (Docker, Kubernetes) across Azure, AWS and GCP.
- Participate in retrospectives, propose improvements and mentor junior backend engineers.
Required profile
- Strong background in backend development using Python and JavaScript/TypeScript.
- Experience building secure, scalable RESTful services.
- Hands‑on experience integrating AI/ML models and working with vector databases.
- Familiarity with cloud platforms (Azure, AWS, GCP) and container orchestration.
Required skills
- Python (FastAPI, Django, Flask)
- TypeScript / JavaScript (Node.js, Express, Nest.js)
- Azure Functions, Azure App Service, Cosmos DB
- AWS Lambda, S3, RDS
- GCP Cloud Run, Firestore
- LangChain, LangGraph, LlamaIndex, Weaviate
- RESTful API design, OAuth2, JWT
- Microservices, Distributed systems, DDD, MVC, Pub/Sub
- TDD, Clean code, Docker, Kubernetes, CI/CD, Git, Observability tooling
What we offer
- Market‑competitive salary
- Transportation facility for female staff
- Eid and performance bonuses, EOBI pension plan, paid‑leave compensation
- Family healthcare including maternity, OPD reimbursement, maternal/paternal leaves
- In‑house recreational facilities: outdoor sports area, billiards, foosball, Xbox, media room, gym
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Fleekbiz Pakistan
Division de Karachi