How long does the Acciona 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 Acciona?

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 Acciona?

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.

Other roles at Acciona:Software Engineer Supply Chain Strategy Consultant

Enterprise · Software Engineer Interview Guide

Interview language: English

How to Pass the Acciona Software Engineer Interview in 2026

The Acciona DNA (TL;DR)

Acciona's 'Sustainability Master Plan' informs interviewers to seek candidates demonstrating a deep understanding of sustainable practices and the ability to integrate them into large-scale infrastructure projects. The final behavioral round often probes for examples of navigating complex regulatory environments and delivering results aligned with their commitment to a 'Circular Economy'.

The Acciona Interview Loop

Your onsite loop will typically consist of 5 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 Acciona interview outcomes, avoid these common traps:

Giving a generic answer about 'wanting to work in tech' or 'liking renewable energy' without connecting it to Acciona's specific projects or impact.
Underestimating the load and not designing for horizontal scalability.
Setting thresholds too rigidly, leading to false positives or negatives.
Not involving stakeholders or communicating the need for change effectively.

Test Yourself: Real Acciona Questions

Three real prompts pulled from our database.

Type · system-design

Design a system to optimize the charging and discharging of a large battery storage facility connected to the grid, aiming to maximize revenue by arbitraging electricity prices while ensuring battery health.

Type · debugging

A system that aggregates energy production data from various renewable sources (solar, wind, hydro) is reporting inconsistent totals. Here's a simplified snippet of the aggregation logic. Identify the potential bug and suggest a fix.

Type · algorithmic

Given a list of solar farm energy production readings (timestamp, megawatt-hours) over a year, write a function to find the contiguous period with the highest average energy production. Consider edge cases like no production days or all days having zero production.

+ many more questions, signals, and worked examples

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Acciona 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
Acciona is a global leader in renewable energy and sustainable infrastructure. What specifically about our mission and work in the energy sector excites you and aligns with your career aspirations as a Software Engineer?

Coding Screen

2
Type · algorithmic
Given a list of solar farm energy production readings (timestamp, megawatt-hours) over a year, write a function to find the contiguous period with the highest average energy production. Consider edge cases like no production days or all days having zero production.
3
Type · algorithmic
Imagine you have sensor data from wind turbines, reporting their current power output and wind speed. Design a data structure and write a function to efficiently query the maximum power output for a given wind speed range. Assume queries will be frequent.
+ 1 more questions in this round (sign up to unlock)

System Design

4
Type · system-design
Design a system to monitor and predict potential failures in a large network of distributed solar inverters. The system should ingest real-time telemetry data, identify anomalies, and alert maintenance teams proactively.
5
Type · system-design
Design a system to optimize the charging and discharging of a large battery storage facility connected to the grid, aiming to maximize revenue by arbitraging electricity prices while ensuring battery health.
+ 1 more questions in this round (sign up to unlock)

Onsite Coding

6
Type · algorithmic
Implement a function that takes a list of wind farm locations (latitude, longitude) and a list of weather forecast data points (timestamp, location, wind speed) and efficiently determines which wind farms are likely to experience optimal wind speeds (e.g., within a specific range) within the next 24 hours. Optimize for large datasets.
7
Type · debugging
A simulation model for predicting solar panel degradation over time is producing results that deviate significantly from expected values, especially for panels in high-temperature regions. Here is the code for the degradation calculation. Debug and fix the issue.
+ 2 more questions in this round (sign up to unlock)

Behavioral / Leadership

8
Type · past-experience
Tell me about a time you had to work with a legacy system or codebase at Acciona that was difficult to understand or modify. What steps did you take to gain understanding, make your changes, and what was the outcome?
9
Type · past-experience
Describe a situation where you identified a significant technical debt or performance bottleneck in a system critical to Acciona's operations (e.g., grid management, energy trading). How did you prioritize addressing it, and what was the result?
+ 3 more questions in this round (sign up to unlock)