Josh Technology Group interview questions and how to prepare

1. JTG builds high-performance microservices for global e-commerce clients. Design a distributed rate limiter for an API gateway that handles millions of requests per second from diverse client applications, ensuring fairness and preventing system overload, while allowing for burst traffic within limits. Outline your choice of data store and consistency model.

   Software EngineerSystem DesignTests: Evaluates understanding of distributed systems, concurrency, rate limiting algorithms, and data store selection under extreme scale for JTG's typical clients.

2. A critical backend service developed by JTG for a fintech client, written in Python, is experiencing high CPU utilization and slow response times under moderate load, leading to customer complaints about payment processing delays. Describe your systematic debugging approach, including tools you would use, to identify and resolve the root cause in a production environment.

   Software EngineerDebuggingTests: Assesses practical debugging skills, knowledge of profiling tools, and systematic problem-solving in a high-stakes JTG client scenario.

3. Given JTG's focus on cloud-native solutions, implement a function in Java or Node.js that processes a stream of real-time sensor data from a logistics client's fleet (e.g., GPS coordinates, speed) and detects if a vehicle deviates more than 100 meters from its planned route, pushing an alert to a Kafka topic. Consider efficiency for high throughput.

   Software EngineerCoding ReasoningTests: Checks coding ability, understanding of stream processing concepts, spatial reasoning, and message queue integration relevant to JTG's logistics projects.

4. JTG is tasked with modernizing a legacy monolithic application for a large enterprise client into a serverless architecture using AWS Lambda and API Gateway. Discuss the challenges you anticipate during this migration, specifically regarding data consistency, state management, and cold start optimization, and how you would mitigate them.

   Software EngineerSystem DesignTests: Probes knowledge of serverless architecture trade-offs, migration strategies, and specific AWS services for complex enterprise scenarios JTG handles.

5. You are integrating a third-party payment gateway for a new e-commerce platform JTG is building. Describe how you would secure the API calls, handle sensitive customer data according to PCI DSS compliance, and implement robust error handling and idempotency for payment transactions.

   Software EngineerSecurity & ArchitectureTests: Evaluates understanding of API security, data protection standards, and reliable transaction design critical for JTG's fintech and e-commerce projects.

6. JTG's front-end team is building a complex analytics dashboard for a global healthcare client, displaying real-time patient data. Which modern JavaScript framework (React, Angular, Vue) would you recommend and why, focusing on performance, maintainability for a large codebase, and scalability for diverse data visualizations?

   Software EngineerFront-end ArchitectureTests: Assesses knowledge of front-end frameworks, their strengths/weaknesses, and ability to justify choices based on JTG's project requirements.

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