Freelance Backend Engineer – Python & Java (OCI | AI-Integrated Systems)

Company Description ThreatXIntel is a startup cyber security company dedicated to safeguarding businesses and organizations from cyber threats. Specializing in services such as cloud security, web and mobile security testing, cloud security assessment, and DevSecOps, ThreatXIntel offers customized solutions tailored to meet the unique challenges of each client. Focused on delivering affordable, high-quality security services, the company aims to empower businesses of all sizes to protect their digital assets. With a proactive approach, ThreatXIntel continuously monitors and tests systems to identify and address vulnerabilities before they are exploited. Committed to excellence, the company ensures peace of mind for clients, enabling them to concentrate on business growth.

Role Description We are seeking a

Freelance Backend Engineer

with strong

Java backend expertise

and solid

Python experience

to support backend modernization, AI-enabled system development, and cloud-native services on

Oracle Cloud Infrastructure (OCI) . This role involves

Python-to-Java migration , building scalable backend services, and contributing to

AI-driven applications similar to Chat-based systems .

Key Responsibilities Migrate and modernize backend services from

Python to Java , ensuring performance, stability, and maintainability Design and develop

Java-based backend services , with the ability to modify, optimize, and extend existing Python services Build scalable backend architectures supporting

chat-style AI applications

(conversation flows, API orchestration, inference handling) Develop RESTful APIs and microservices for AI-enabled platforms Integrate AI services and frameworks, including

MCP-based AI integrations

and LLM-driven components Design and implement

unit tests and integration tests

to ensure system reliability and regression safety Deploy and operate services on

Oracle Cloud Infrastructure (OCI)

using cloud-native patterns Participate in

system design , architecture discussions, and performance optimization initiatives Collaborate with cross-functional teams to deliver secure, scalable, and high-availability systems Required Skills & Experience Strong backend development experience in

Java Working knowledge of

Python , with the ability to modify, optimize, and refactor existing Python code Experience with

Python-to-Java migration

or multi-language backend environments Experience building

REST APIs , microservices, and distributed systems Hands-on experience with

OCI (Oracle Cloud Infrastructure)

or similar cloud platforms Solid understanding of

unit testing and integration testing frameworks Experience integrating

AI/LLM services

into backend systems Strong understanding of

system design, scalability, and performance considerations Preferred Experience Experience building

chat-based or conversational AI applications

(OpenAI-style architectures) Familiarity with AI orchestration, agent execution, or inference pipelines Exposure to CI/CD pipelines and containerized deployments Experience with cloud-native observability and monitoring