Freelance Backend Engineer (Python → Java | OCI | AI Applications)

Company Description ThreatXIntel is a dynamic cybersecurity startup dedicated to protecting businesses and organizations from cyber threats. We specialize in providing tailored and cost-effective solutions in areas such as cloud security, web and mobile security testing, DevSecOps, and more. Our team of experts employs a proactive approach, identifying vulnerabilities before they can be exploited. By continuously monitoring and assessing digital environments, we aim to give our clients peace of mind, allowing them to focus on their growth. ThreatXIntel is committed to ensuring that businesses of all sizes have access to top-notch cybersecurity services to safeguard their digital assets.

Role Description We are looking for a

reliable, delivery-oriented Freelance Backend Engineer

with strong

Java backend expertise , solid

Python understanding , and hands-on experience building

AI-driven, chat-style applications

(similar to OpenAI/ChatGPT architectures). The ideal candidate has a

problem-solving mindset , can independently own backend deliverables, and is comfortable working in

Oracle Cloud Infrastructure (OCI)

environments.

Key Responsibilities Migrate existing backend services from

Python to Java

while preserving functionality and performance Design, develop, and enhance

Java-based backend services , with the ability to tweak and maintain Python components when required Build backend systems supporting

chat-based AI applications

(conversation flows, APIs, session handling, orchestration) Integrate

AI components

and frameworks (e.g., MCP, LLM integrations, inference APIs) Design scalable and maintainable

system architectures

for distributed backend services Develop and maintain

REST APIs

for frontend and AI service consumption Write

unit tests and integration tests

to ensure reliability and production readiness Deploy and operate services on

Oracle Cloud Infrastructure (OCI) Collaborate closely with stakeholders to ensure

on-time, high-quality delivery Required Skills & Experience Strong hands-on experience in

Java backend development Good working knowledge of

Python , with the ability to modify and maintain Python codebases Proven experience with

Python → Java migration projects Experience building or supporting

chat-based or conversational AI applications Hands-on exposure to

AI/LLM integrations

(MCP or similar frameworks preferred) Experience working on

Oracle Cloud Infrastructure (OCI) Solid understanding of

system design , scalability, and backend architecture Strong experience in

unit testing and integration testing Familiarity with REST APIs, microservices, and cloud-native patterns What We’re Looking For Delivery-oriented mindset

– focuses on outcomes, not just code Strong

problem-solving and debugging skills Ability to work independently with minimal supervision Reliable, accountable, and able to meet deadlines Comfortable owning backend components end-to-end