10+ Senior Scientific Officer Interview Questions and Answers

Transactions across microservices can be handled using distributed transactions or compensating transactions.

• Use distributed transactions to ensure all services commit or rollback together

• Implement compensating transactions to handle failures and maintain data consistency

• Consider using event sourcing or message queues to decouple services and ensure eventual consistency

Angular architecture, life cycle hooks, DI, data communication, pipes, CSS box model, authguard, forms, semantic elements, closure

• Angular architecture involves modules, components, services, and directives

• Life cycle hooks are methods that allow you to tap into specific points in a component's life cycle

• Dependency Injection (DI) is a design pattern in which a class receives its dependencies from external sources rather than creating them itself

• Data communication between compon...read more

Methodology and principles of analytes involve the process of identifying and measuring chemical substances in a sample.

• Analytes are identified through various techniques such as chromatography, spectrometry, and immunoassays.

• The principles of analytes involve accuracy, precision, sensitivity, and specificity.

• Analytes can be found in various fields such as medicine, environmental science, and forensic science.

• Examples of analytes include glucose in blood, pollutants in water,...read more

Use Java 8 lambdas to covert list of employees to map

• Use stream() method to convert the list to a stream

• Use Collectors.toMap() method to convert the stream to a map

• Specify the key and value mappings in the toMap() method

DI and IoC are design principles in software development. RestTemplate is a class for making HTTP requests. Design patterns are reusable solutions to common problems.

• DI (Dependency Injection) is a design pattern where objects are passed their dependencies rather than creating them internally.

• IoC (Inversion of Control) is a design principle where the control of object creation and lifecycle is inverted to a container or framework.

• RestTemplate is a class in Spring Framework for...read more

Microservices communicate through lightweight protocols like HTTP, messaging queues, and RPC.

• HTTP: RESTful APIs are commonly used for communication between microservices.

• Messaging queues: Services can communicate asynchronously through message brokers like RabbitMQ or Kafka.

• RPC (Remote Procedure Call): Services can directly call each other's functions over a network.

I don't have access to the turnover data of the company.

The current project architecture is efficient but could be improved in terms of scalability and flexibility.

• Evaluate the performance of the current architecture in terms of speed, reliability, and scalability.

• Identify any bottlenecks or areas of improvement such as redundant processes or outdated technologies.

• Consider implementing microservices architecture for better scalability and flexibility.

• Utilize cloud services for better resource management and cost efficiency.

• Regular...read more

SQL is relational database, NoSQL is non-relational. DynamoDB uses primary keys for data retrieval.

• SQL is a relational database management system, while NoSQL is a non-relational database management system.

• SQL databases use structured query language for defining and manipulating data, while NoSQL databases use various data models like document, key-value, graph, etc.

• In DynamoDB, keys are used for data retrieval. Primary key can be either a single attribute (simple primary key...read more

The critical criteria for a lab include accuracy, precision, reliability, safety, cleanliness, and adherence to protocols.

• Accuracy in test results is essential for reliable data.

• Precision ensures consistent and reproducible results.

• Reliability of equipment and procedures is crucial for valid outcomes.

• Safety measures must be strictly followed to protect personnel and samples.

• Cleanliness and organization are important for preventing contamination.

• Adherence to protocols and stan...read more

Singleton class in Java ensures only one instance of the class is created.

• Use private constructor to prevent instantiation from outside the class.

• Provide a static method to get the instance of the class.

• Use a private static variable to hold the instance of the class.

Quality control involves checking products to ensure they meet standards, while quality assurance focuses on processes to prevent defects.

• Quality control involves inspecting products to ensure they meet specified standards

• Quality assurance focuses on implementing processes to prevent defects from occurring

• Quality control is reactive, while quality assurance is proactive

• Quality control involves testing samples of products, while quality assurance involves continuous monitoring...read more

HashMap is a data structure that stores key-value pairs and allows for fast retrieval of values based on keys.

• HashMap uses a hash function to map keys to indices in an array.

• Collisions can occur when multiple keys hash to the same index, which is resolved using techniques like chaining or open addressing.

• HashMap in Java is a popular implementation that provides constant-time complexity for basic operations like get and put.

Metrics for a good Code Review include code quality, adherence to coding standards, feedback provided, and timely completion.

• Code quality - Ensure the code is efficient, readable, and maintainable.

• Adherence to coding standards - Check if the code follows the established guidelines.

• Feedback provided - Evaluate the constructive criticism and suggestions given during the review.

• Timely completion - Assess if the review was done within the expected timeframe.

Circuit Breaker design pattern is used to prevent a system from repeatedly trying to execute an operation that is likely to fail.

• Circuit Breaker pattern is used to handle faults in distributed systems by providing a way to fail fast and prevent cascading failures.

• It monitors the number of failures and once a threshold is reached, it opens the circuit and stops executing the operation.

• After a certain period of time, the circuit can be half-opened to test if the operation is su...read more

Various machines are used in scientific research, including spectrometers, centrifuges, and chromatographs for analysis and experimentation.

• Spectrometers: Used for analyzing the composition of substances, e.g., mass spectrometry in chemistry.

• Centrifuges: Separate components of mixtures based on density, commonly used in biology labs.

• Chromatographs: Employed for separating mixtures, such as gas chromatography in environmental testing.

• Microscopes: Essential for observing small ...read more