Skip to contentSkip to footer

Fullstack Developer Interview Questions

Salaries
Interviews

4,005 fullstack developer interview questions shared by candidates

the questions asked were First coding question - Given a string and asked to find out count of characters present using stream 8 Map vs flatmap Different java 8 features and explain What is method reference in java 8 and give an example Different interface methods Asked Microservices if I worked on it Exception handling in spring Spring vs spring boot How RestApi works How to implement security in spring JavaScript - Dev vs span Box tag
avatar

Java Fullstack Developer

Interviewed at HCLTech

3.5★
Jul 28, 2025

the questions asked were First coding question - Given a string and asked to find out count of characters present using stream 8 Map vs flatmap Different java 8 features and explain What is method reference in java 8 and give an example Different interface methods Asked Microservices if I worked on it Exception handling in spring Spring vs spring boot How RestApi works How to implement security in spring JavaScript - Dev vs span Box tag

Context for Live Code Review You are asked to review the design of a library/SDK for a feature that will be used in different apps, and improve it in collaboration with the interviewer. It's a basic Daily Workout Engine and this library will be responsible for handling the state of a daily workout. In this code below, you will find out the domain logic to be reviewed. It was created by a junior engineer (the interviewer :)) and this engineer is not yet confident and wants your feedback before opening a pull/merge request. Times Mandatory rest between exercises Rest between reps (2-3 seconds) Detailed Requirements of the Task 1. It should guarantee workout lifecycle: 1 - WORKOUT_CREATED 2 - WORKOUT_EXERCISE_X_STARTED (X = 1 TO [3-10]) 3 - WORKOUT_EXERCISE_X_COMPLETED (X = 1 TO [3-10]) 4 - WORKOUT_FINISHED 2. A daily workout has a minimum of 3 exercises and maximum 10. 3. A daily workout has a mandatory rest time between the exercises, in seconds. 4. An exercise has a number of repetitions to be done and a minimal and max time to complete it, after it has started. 5. Minimal and max time depends on the number of repetitions. Minimal time is 2 seconds per repetition and max is 3. 6. If the exercise is completed outside the minimal and max time, it's flagged as failed. 7. When it ends, a score is given to the workout. The score is integer between 0 and 10. Round(non-failed exercises / total exercises) * 10  # workout_controller.py from datetime import datetime def main(): controller = WorkoutController() controller.create_workout(1, 60) controller.add_exercise(10) controller.add_exercise(5) controller.start_exercise(0) controller.complete_exercise(0) controller.start_exercise(1) controller.complete_exercise(1) controller.finish_workout() class WorkoutController: def __init__(self): self.workout_id = 0 self.rest_time = 0 self.exercises = [] self.score = 0 self.status = "NOT_STARTED" def create_workout(self, id, rest_time): self.workout_id = id self.rest_time = rest_time self.status = "WORKOUT_CREATED" print(f"Workout {self.workout_id} created with {rest_time} seconds rest time") def add_exercise(self, repetitions): exercise = self.Exercise(repetitions) self.exercises.append(exercise) print(f"Added exercise number {self.exercises[exercise] + 1} with {repetitions} repetitions") def start_exercise(self, index): if 0 <= index < len(self.exercises): exercise = self.exercises[index] exercise.start() print(f"Started exercise {index}") else: print(f"No exercise found at index {index}") def complete_exercise(self, index): if 0 <= index < len(self.exercises): exercise = self.exercises[index] end_time = datetime.now() exercise.complete(end_time) print(f"Completed exercise {index}.") else: print(f"No exercise found at index {index}") def finish_workout(self): self.status = "WORKOUT_FINISHED" self.calculate_score() print(f"Workout finished with score: {self.score}") def calculate_score(self): passed_exercises = sum([1 for exercise in self.exercises if exercise.is_passed()]) self.score = 0 if not self.exercises else int((passed_exercises / len(self.exercises)) * 10) class Exercise: def __init__(self, repetitions): self.repetitions = repetitions self.start_time = None self.min_time = repetitions * 2 self.max_time = repetitions * 3 self.status = "NOT_STARTED" def start(self): self.start_time = datetime.now() self.status = "STARTED" def complete(self, end_time): if self.start_time: duration = (end_time - self.start_time).total_seconds() if self.min_time <= duration <= self.max_time: self.status = "COMPLETED" else: self.status = "FAILED" def is_passed(self): return self.status == "COMPLETE" if __name__ == "__main__": main()
avatar

Fullstack Engineer

Interviewed at Welltech

2.2★
Feb 11, 2026

Context for Live Code Review You are asked to review the design of a library/SDK for a feature that will be used in different apps, and improve it in collaboration with the interviewer. It's a basic Daily Workout Engine and this library will be responsible for handling the state of a daily workout. In this code below, you will find out the domain logic to be reviewed. It was created by a junior engineer (the interviewer :)) and this engineer is not yet confident and wants your feedback before opening a pull/merge request. Times Mandatory rest between exercises Rest between reps (2-3 seconds) Detailed Requirements of the Task 1. It should guarantee workout lifecycle: 1 - WORKOUT_CREATED 2 - WORKOUT_EXERCISE_X_STARTED (X = 1 TO [3-10]) 3 - WORKOUT_EXERCISE_X_COMPLETED (X = 1 TO [3-10]) 4 - WORKOUT_FINISHED 2. A daily workout has a minimum of 3 exercises and maximum 10. 3. A daily workout has a mandatory rest time between the exercises, in seconds. 4. An exercise has a number of repetitions to be done and a minimal and max time to complete it, after it has started. 5. Minimal and max time depends on the number of repetitions. Minimal time is 2 seconds per repetition and max is 3. 6. If the exercise is completed outside the minimal and max time, it's flagged as failed. 7. When it ends, a score is given to the workout. The score is integer between 0 and 10. Round(non-failed exercises / total exercises) * 10  # workout_controller.py from datetime import datetime def main(): controller = WorkoutController() controller.create_workout(1, 60) controller.add_exercise(10) controller.add_exercise(5) controller.start_exercise(0) controller.complete_exercise(0) controller.start_exercise(1) controller.complete_exercise(1) controller.finish_workout() class WorkoutController: def __init__(self): self.workout_id = 0 self.rest_time = 0 self.exercises = [] self.score = 0 self.status = "NOT_STARTED" def create_workout(self, id, rest_time): self.workout_id = id self.rest_time = rest_time self.status = "WORKOUT_CREATED" print(f"Workout {self.workout_id} created with {rest_time} seconds rest time") def add_exercise(self, repetitions): exercise = self.Exercise(repetitions) self.exercises.append(exercise) print(f"Added exercise number {self.exercises[exercise] + 1} with {repetitions} repetitions") def start_exercise(self, index): if 0 <= index < len(self.exercises): exercise = self.exercises[index] exercise.start() print(f"Started exercise {index}") else: print(f"No exercise found at index {index}") def complete_exercise(self, index): if 0 <= index < len(self.exercises): exercise = self.exercises[index] end_time = datetime.now() exercise.complete(end_time) print(f"Completed exercise {index}.") else: print(f"No exercise found at index {index}") def finish_workout(self): self.status = "WORKOUT_FINISHED" self.calculate_score() print(f"Workout finished with score: {self.score}") def calculate_score(self): passed_exercises = sum([1 for exercise in self.exercises if exercise.is_passed()]) self.score = 0 if not self.exercises else int((passed_exercises / len(self.exercises)) * 10) class Exercise: def __init__(self, repetitions): self.repetitions = repetitions self.start_time = None self.min_time = repetitions * 2 self.max_time = repetitions * 3 self.status = "NOT_STARTED" def start(self): self.start_time = datetime.now() self.status = "STARTED" def complete(self, end_time): if self.start_time: duration = (end_time - self.start_time).total_seconds() if self.min_time <= duration <= self.max_time: self.status = "COMPLETED" else: self.status = "FAILED" def is_passed(self): return self.status == "COMPLETE" if __name__ == "__main__": main()

Viewing 1821 - 1830 interview questions

Glassdoor has 4,005 interview questions and reports from Fullstack developer interviews. Prepare for your interview. Get hired. Love your job.