About CTS Group

CTS Group is a fast-growing international design and build company specialising in data center development across Europe, the Middle East, and Africa (EMEA). We combine engineering excellence, innovation, and digital transformation to deliver high-performance, sustainable, and future-ready data center solutions. With over 40 nationalities represented across our teams, CTS fosters a collaborative, inclusive, and high-performance culture where innovation and technical precision drive every project. Beyond construction, CTS develops digital systems and standardised modular data center units to meet the evolving needs of hyperscalers, colocation providers, and enterprise clients. Our proven track record and strong partnerships have established CTS as a trusted industry leader delivering large-scale, complex data center facilities with speed, efficiency, and excellence.

Role Overview

The Junior Electrical Engineer – ELV supports the design and delivery of low-voltage power distribution and extra-low-voltage systems for data center and mission-critical facilities. Working under the supervision of senior engineers, the role produces single-line diagrams, panel schedules, and lighting layouts to established standards using EPLAN, Revit, ETAP, and DIALux.

Key Responsibilities

• Support the design and development of electrical systems for data centers (power distribution, grounding, lighting, standby power) under the guidance of senior or lead engineers.

• Assist in creating single-line diagrams, electrical schematics, and panel schedules using EPLAN and Revit, on defined design tasks and drawing packages.

• Support power system analysis (short circuit, load flow, arc flash, protection coordination) using ETAP under supervision.

• Assist in developing lighting and emergency lighting designs using DIALux.

• Coordinate with multidisciplinary teams (mechanical, civil, architectural) on assigned scopes of work.

• Participate in peer design reviews and support compliance checks against international standards (IEC, IEEE, NEC, NFPA 70E).

• Prepare draft design documentation, specifications, and Bills of Quantities (BOQs) for review.

• Support RFI responses and site queries under supervision.

• Stay updated with emerging technologies and best practices in mission-critical power systems.

Required Skills and Experience

• Bachelor's degree in Electrical Engineering.

• Preferably proficient in or familiar with: ETAP, EPLAN, Revit, and DIALux.

• Strong knowledge of electrical codes and standards (NEC, IEC, IEEE, NFPA 70E).

• Familiarity with Tier classifications (Uptime Institute) and redundancy concepts (N, N+1, 2N).

• Exposure to HV/MV substations, switchgear layouts, and BMS integration.

• Knowledge of digital twin concepts or energy monitoring systems is a plus.

• Excellent problem-solving, communication, and teamwork skills.

• Proficiency in English (mandatory); Portuguese and other languages are an advantage.

• 3–5 years of relevant electrical engineering experience; works under the guidance of senior or lead engineers on defined design tasks and drawing packages.

What We Offer

Competitive salary package aligned with your professional experience, health insurance, opportunity for professional growth and development, continuous training and learning opportunities, and a dynamic, professional, and collaborative work environment in Porto, with a diverse and inclusive team that values innovation and excellence.