How long does the Iberdrola interview process take?

Most candidates spend between 4 and 8 weeks from recruiter screen to offer. The onsite loop itself runs in a single day or is split across two half-days, with debrief and offer typically within 5 business days after.

How should I prepare specifically for Iberdrola?

Focus on three things: (1) the company DNA shown above — what they actually grade for, (2) the rounds in your loop, especially the round most candidates underestimate, and (3) drilling on the question types in this guide using a structured framework like CIRCLES or STAR.

Does this apply to engineering or design roles at Iberdrola?

The DNA stays the same — what changes is the round mix. SWE candidates face coding screens instead of Product Sense; designers face portfolio reviews and design exercises. The "what they value" and behavioral signals carry across all functions.

Why are you interested in joining Iberdrola, and what specifically about our work in the energy sector excites you as a software engineer?

Type: Motivation. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Iberdrola operates a vast network of renewable energy sources (solar farms, wind turbines). You are given a 2D grid representing a geographical area, where 'W' denotes a potential wind turbine location, 'S' a solar farm location, and '.' an empty space. Write a function to find the maximum number of non-overlapping renewable energy installations (wind turbines and solar farms) that can be placed, subject to the constraint that no two installations can be within a Manhattan distance of 5 units from each other.

Type: Algorithmic. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Design a system to predict and manage potential grid overload events across Iberdrola's European network. The system should ingest data from various sources (weather forecasts, historical demand, real-time consumption, renewable energy generation) and predict high-risk periods, potentially triggering automated load balancing actions.

Type: Distributed Systems. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Iberdrola is developing a new customer portal for managing energy accounts, viewing consumption, and interacting with smart home devices. Design the backend architecture for this portal, considering scalability, security, and the integration of various services (e.g., billing, device management, analytics).

Type: Architecture. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

You are given a list of time intervals, each representing a period when a specific wind turbine was operational (e.g., `[(start_time, end_time, turbine_id), ...]`). Write a function to calculate the total uptime for each turbine within a given query period `(query_start, query_end)`. Ensure your solution correctly handles overlapping intervals and edge cases.

Type: Algorithmic. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

A critical service responsible for processing energy meter readings is experiencing intermittent failures. Below is a simplified (and potentially buggy) Python code snippet. Identify potential bugs, explain the root cause, and provide a corrected version. The service is supposed to calculate the average consumption per day, but sometimes returns incorrect averages or crashes.

Type: Debugging. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Tell me about a time you had a significant technical disagreement with a colleague or manager. How did you approach the situation, what was the discussion like, and what was the outcome?

Type: Conflict Resolution. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Describe a situation where you had to debug a complex and critical issue in a system you weren't initially familiar with. What steps did you take to understand the system, diagnose the problem, and implement a fix? How did you ensure the fix was robust?

Type: Ownership. Sign up at JobMentis to see the full framework, grading signals, and worked answer for this question.

Other roles at Iberdrola:Software Engineer Supply Chain Strategy Consultant

Enterprise · Software Engineer Interview Guide

How to Pass the Iberdrola Software Engineer Interview in 2026

The Iberdrola DNA (TL;DR)

Iberdrola seeks candidates demonstrating strong analytical skills, a commitment to sustainability, and a proactive approach to innovation in the energy sector. They value adaptability, teamwork, and a global mindset, particularly for roles involving renewable energy projects and grid modernization.

The Iberdrola Interview Loop

Your onsite loop will typically consist of 4 rounds.

1
Round 1
Recruiter Screen
Motivation, role fit, logistics.
2
Round 2
Coding Screen
LeetCode-medium algorithmic problems under time pressure.
3
Round 3
System Design
Distributed systems, trade-offs at scale, architecture under constraints.
4
Round 4
Onsite Coding
LeetCode-hard, debugging, code clarity, edge cases.
5
Round 5
Behavioral / Leadership
Past evidence of ownership, influence, resolving conflict.

The Danger Zone: Top Reasons Candidates Fail

Based on our database of Iberdrola interview outcomes, avoid these common traps:

Neglecting device connectivity issues, intermittent network availability, and security vulnerabilities.
Using incorrect data types or performing operations that lead to precision loss.
Focusing solely on personal career growth without demonstrating an understanding of Iberdrola's business or industry challenges.
Underestimating the scale and latency requirements for real-time grid management.

Test Yourself: Real Iberdrola Questions

Three real prompts pulled from our database.

Type · Ownership

Tell me about a time you took ownership of a significant supply chain problem or project that was not explicitly part of your job description. What was the situation, what did you do, and what was the outcome?

Type · Scalability

Design a system to monitor and control millions of IoT devices (smart meters, grid sensors, EV chargers) connected to Iberdrola's network. The system needs to handle high-volume data ingestion, device state management, and command execution with low latency.

Type · Algorithmic

Given a stream of real-time energy consumption data from smart meters (represented as tuples of (timestamp, meter_id, consumption_kwh)), design an algorithm to detect anomalous consumption patterns for each meter within a rolling 24-hour window. An anomaly is defined as consumption deviating by more than 3 standard deviations from the mean consumption for that meter during that window.

+ many more questions, signals, and worked examples

Unlock the rubric →

Iberdrola Interview Question Bank

A sample from our database, grouped by round. Sign up to see the full set.

9 of 16 questions shown

Recruiter Screen

1
Type · Motivation
Why are you interested in joining Iberdrola, and what specifically about our work in the energy sector excites you as a software engineer?

Coding Screen

2
Type · Algorithmic
Given a stream of real-time energy consumption data from smart meters (represented as tuples of (timestamp, meter_id, consumption_kwh)), design an algorithm to detect anomalous consumption patterns for each meter within a rolling 24-hour window. An anomaly is defined as consumption deviating by more than 3 standard deviations from the mean consumption for that meter during that window.
3
Type · Algorithmic
Iberdrola operates a vast network of renewable energy sources (solar farms, wind turbines). You are given a 2D grid representing a geographical area, where 'W' denotes a potential wind turbine location, 'S' a solar farm location, and '.' an empty space. Write a function to find the maximum number of non-overlapping renewable energy installations (wind turbines and solar farms) that can be placed, subject to the constraint that no two installations can be within a Manhattan distance of 5 units from each other.
+ 1 more questions in this round (sign up to unlock)

System Design

4
Type · Distributed Systems
Design a system to predict and manage potential grid overload events across Iberdrola's European network. The system should ingest data from various sources (weather forecasts, historical demand, real-time consumption, renewable energy generation) and predict high-risk periods, potentially triggering automated load balancing actions.
5
Type · Architecture
Iberdrola is developing a new customer portal for managing energy accounts, viewing consumption, and interacting with smart home devices. Design the backend architecture for this portal, considering scalability, security, and the integration of various services (e.g., billing, device management, analytics).
+ 1 more questions in this round (sign up to unlock)

Onsite Coding

6
Type · Algorithmic
You are given a list of time intervals, each representing a period when a specific wind turbine was operational (e.g., `[(start_time, end_time, turbine_id), ...]`). Write a function to calculate the total uptime for each turbine within a given query period `(query_start, query_end)`. Ensure your solution correctly handles overlapping intervals and edge cases.
7
Type · Debugging
A critical service responsible for processing energy meter readings is experiencing intermittent failures. Below is a simplified (and potentially buggy) Python code snippet. Identify potential bugs, explain the root cause, and provide a corrected version. The service is supposed to calculate the average consumption per day, but sometimes returns incorrect averages or crashes.
+ 2 more questions in this round (sign up to unlock)

Behavioral / Leadership

8
Type · Conflict Resolution
Tell me about a time you had a significant technical disagreement with a colleague or manager. How did you approach the situation, what was the discussion like, and what was the outcome?
9
Type · Ownership
Describe a situation where you had to debug a complex and critical issue in a system you weren't initially familiar with. What steps did you take to understand the system, diagnose the problem, and implement a fix? How did you ensure the fix was robust?
+ 3 more questions in this round (sign up to unlock)

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Interview tracks at Iberdrola

How Iberdrola's DNA translates across functions. Pick your role.

SWE candidates should showcase expertise in scalable systems for smart grids, renewable energy management platforms, and data analytics for operational efficiency. Experience with IoT, cloud solutions, and cybersecurity for critical infrastructure is highly valued.

Ownership

Scalability

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Unlock the Software Engineer grading rubric for Iberdrola

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