Full Stack Engineer (AI Developer) - #1773

JOBSTER PRIVATE LTD.; Singapore; On-site; SGD 120,000 - 190,000; Full time

Job summary

JOBSTER PRIVATE LTD. is seeking an AI Developer to build, test and deploy agentic AI applications on AWS, using Bedrock foundation models, Guardrails and AgentCore for secure, scalable solutions.

You will write production-quality code and collaborate with architects, product owners and security teams. Responsibilities include developing agentic AI workflows, integrating LLMs via Bedrock Runtime APIs, building RAG pipelines, configuring guardrails, and deploying agents to Bedrock AgentCore.

Qualifications

• 4+ years of software development experience with 1+ year building Generative AI / LLM apps.
• Hands-on experience with agentic AI solutions: tool use, planning, memory, multi-step reasoning & multi-agent collaboration.
• Practical experience with Amazon Bedrock (InvokeModel, Knowledge Bases, Agents) & Guardrails.
• Experience with Bedrock AgentCore (Runtime, Gateway, Memory, Identity, Observability).
• Strong Python proficiency (boto3, async, FastAPI) and familiarity with TypeScript/Node.js.

Responsibilities

• Develop agentic AI applications and multi-agent workflows using Bedrock and agent frameworks.
• Integrate LLMs via Bedrock Runtime APIs with robust prompt engineering, tooling and structured outputs.
• Build RAG pipelines using Bedrock Knowledge Bases and vector stores.
• Configure Bedrock Guardrails and apply ApplyGuardrail API in flows.
• Deploy agents to Bedrock AgentCore Runtime and expose tools via Gateway; implement memory solutions.
• Implement authentication/authorization using AgentCore Identity and AWS IAM.
• Use AgentCore Code Interpreter and Browser tools for secure code execution and web interactions.
• Instrument observability with CloudWatch, latency and cost tracking; monitor tool calls.
• Build APIs/integrations with enterprise systems using Lambda, API Gateway, Step Functions.
• Write clean, tested, documented code; participate in code reviews and CI/CD.
• Troubleshoot and optimise agent performance, safety and cost.

Skills

Python proficiency

Generative AI / LLM experience

Agentic AI solutions

Git / CI/CD familiarity

Containerisation

TypeScript/Node.js

Education

Degree in Computer Science or Engineering

Tools

Docker

FastAPI

CDK / Terraform / CloudFormation

GitHub Actions / CodePipeline

Job description

Role Overview

We are looking for an AI Developer to build, test and deploy intelligent agentic applications on AWS. You will work with Amazon Bedrock foundation models, Bedrock Guardrails and Amazon Bedrock AgentCore to deliver secure, reliable and scalable AI solutions. You will be a core member of the AI engineering team, writing production-quality code and collaborating with architects, product owners and security teams.

Key Responsibilities

• Develop agentic AI applications and multi-agent workflows using Amazon Bedrock and agent frameworks such as Strands Agents, LangChain / LangGraph.
• Integrate LLMs via the Bedrock Runtime APIs (InvokeModel, Converse, streaming) with robust prompt engineering, tool/function calling and structured outputs.
• Build RAG pipelines using Bedrock Knowledge Bases, vector stores and custom retrieval logic.
• Configure and tune Bedrock Guardrails (content filters, denied topics, PII filters, contextual grounding checks) and apply the ApplyGuardrail API in agent and application flows.
• Deploy agents to Amazon Bedrock AgentCore Runtime; expose tools and APIs through AgentCore Gateway; implement session and long-term memory with AgentCore Memory.
• Implement authentication and authorisation for agents and tools using AgentCore Identity and AWS IAM.
• Use AgentCore Code Interpreter and Browser tools where agents need to execute code or interact with web content securely.
• Instrument agents with AgentCore Observability, CloudWatch and tracing to monitor latency, token usage, cost and tool-call behaviour.
• Build and run automated evaluations and regression tests for prompts, agents and guardrails.
• Develop APIs and integrations with enterprise systems using Lambda, API Gateway, Step Functions and event-driven patterns.
• Write clean, tested, documented code; participate in code reviews and CI/CD pipelines.
• Troubleshoot and optimise agent performance, accuracy, safety and cost.

Required Skills & Experience

• 4+ years of software development experience, with 1+ year building Generative AI / LLM applications.
• Hands-on experience developing Agentic AI solutions: tool use, planning, memory, multi-step reasoning and multi-agent collaboration.
• Practical experience with Amazon Bedrock (model invocation, Converse API, Knowledge Bases, Agents).
• Experience configuring and testing Bedrock Guardrails for safety, privacy and grounding.
• Working knowledge of Amazon Bedrock AgentCore (Runtime, Gateway, Memory, Identity, Observability, Code Interpreter, Browser).
• Strong Python proficiency (boto3, async programming, FastAPI or similar); TypeScript/Node.js a plus.
• Good understanding of AWS services: Lambda, S3, DynamoDB, API Gateway, IAM, CloudWatch, ECR.
• Familiarity with Git, CI/CD and containerisation (Docker).

Technical Expertise

• LLM development: prompt engineering, structured outputs, function calling, streaming, context management.
• Agent frameworks: Strands Agents SDK, LangChain / LangGraph, CrewAI or AutoGen; MCP server/client integration.
• AWS Bedrock: Converse API, Knowledge Bases, Guardrails (including ApplyGuardrail), Prompt Management, Flows.
• AgentCore: Runtime deployment, Gateway tool exposure, Memory strategies, Identity, Observability.
• Data & retrieval: embeddings, vector databases (OpenSearch, pgvector), chunking strategies, reranking.
• DevOps: Docker, CDK / Terraform / CloudFormation, GitHub Actions / CodePipeline, unit and integration testing.

Preferred Qualifications

• AWS Certified Developer - Associate, AWS Certified AI Practitioner or AWS Certified Machine Learning - Specialty.
• Experience with LLM evaluation tools and red-teaming / adversarial testing of AI systems.
• Knowledge of security best practices for AI: prompt injection, data leakage and least-privilege access.
• Experience with front-end integration (React, Streamlit) for AI applications.

Soft Skills

• Strong problem-solving and analytical skills.
• Collaborative, curious and keen to learn rapidly evolving technology.
• Clear written and verbal communication.
• Ownership mindset with attention to quality and safety.

Education

Degree in Computer Science, Engineering or a related field (or equivalent practical experience).