Common Lisp Developer

Our Company

3E is a leading technology and SaaS company providing digital solutions and expert services that maximise the performance of renewable energy assets. As a trusted data services partner, we deliver future-proof and easy-to-deploy solutions over a project’s entire lifetime, supporting developers, asset managers, operators, investors, EPC contractors and IPP's.

3E's one-stop digital platform SynaptiQ provides a complete range of leading SaaS solutions for development, operational asset management and analytics. In addition, 3E supplies various expert services for engineering, technical and strategic decision support.

3E has a proven track record spanning more than 20 years across 60 countries. It operates an international team of 100+ experts from its headquarters in Brussels and offices in Barcelona, Paris, Toulouse, Cape Town and Chennai.

Strengthened by partnerships with universities and industry pioneers, 3E continues to explore innovations and new developments in renewable energy and digitalisation, striving to provide the industry’s most advanced energy intelligence and AI-based solutions.

Our SaaS Solution

SynaptiQ is 3E’s SaaS product, an independent, evolutionary software suite for asset management of renewable energy portfolios (more information on SynaptiQ collects near-real time data of more than 20 million devices spread over 10 thousands utility scale and commercial solar and wind sites spread all over the globe.

We develop and operate advanced analytical services to enrich the monitoring data by:

  • satellite imaging data,
  • meteorological modelling,
  • advanced system modelling,
  • machine learning & artificial intelligence.

The platform combines domains related to big data, high-performance processing, IoT protocols and AI and is the product of the interactions between a multidisciplinary team of developers, scientists, renewable energy architects, electrical engineers, and enthusiast sales that implement, operate and commercialize SynaptiQ worldwide.

The added value realized by SynaptiQ is performance improvement and operational cost reduction for its Operations & Maintenance customers.

What you will be doing

At 3E, we recognize the value of Common Lisp and the unique skills that developers in this language bring to the table. We are currently seeking a senior Common Lisp developer with at least 5 years of work experience in an operational environment, with a focus on large knowledge management systems.

While we appreciate the passion and interest that many developers have for Common Lisp, we are specifically seeking candidates who have hands-on experience working on Common Lisp projects in a professional setting, rather than just personal research or hobby projects.

Our ideal candidate is a senior Common Lisp Developer who:

  • Has a strong sense of architectural balance and

  • Has the ability to operate effectively in a multi-tasking environment.

  • Has experience writing elegant, clean code

  • Is not afraid to pick things up fast and be proactive in a team

  • Is creative and innovative – a true problem-solver

  • Embraces new technologies where they can be applied


  • Design, develop, and maintain Common Lisp software applications

  • Collaborate with other developers to integrate software components into a

    fully functional system

  • Work closely with project managers and stakeholders to ensure project


  • Develop and maintain technical documentation for software applications

  • Ensure software quality through testing and code review

Our ideal candidate

Writing elegant, clean code is your thing and you are not afraid to pick things up fast and be proactive in a team. Someone creative and innovative is welcome – we embrace new technologies where they can be applied and make sense.

The ideal candidate has the following qualifications:

  • Bachelor's or Master's degree in Computer Science or related field

  • 5+ years of experience in Common Lisp development

  • Experience with large knowledge management systems


  • Experience in functional language and readiness to get hands-on with a LISP data engine.

  • Strong sense of architectural balance and the implications of changes to a many-layered system.

  • Strong understanding of software development principles and methodologies

  • Experience with Agile development methodologies

  • Strong problem-solving and analytical skills

  • Excellent verbal and written communication skills

  • Ability to work independently and in a team environment

  • Demonstrated ability to operate effectively in a multi-tasking environment.

  • Excellent command of English both in written and verbal form.

Bonus points for:

  • Any other languages (Dutch, French, Portuguese, ...).

  • Prior experience with functional languages like Clojure or Scala.

  • Prior experience in Linux administration and shell scripting.

  • Experience in working in a distributed team.

  • Familiarity or interest with Renewables Energy Sector, IoT, Digital Twin systems.

While not as widely used as some other languages, Common Lisp continues to be a popular for complex and specialized projects. This means that opportunities for Common Lisp developers are often niche and highly specialized, making this opportunity an exciting one. If you are a highly skilled Common Lisp developer looking for an exciting and challenging opportunity, we would love to hear from you.

What we offer in return

Our offices are hidden in the centre of Brussels with a view on a pond, with ducks and a heron bringing a regular visit. In addition to a stimulating atmosphere in a highly motivated group of people, 3E offers a unique opportunity to further develop yourself in a company/team with an ambitious growth plan, delivering innovative services.


  • Attractive salary package in line with your level of experience, including group insurance, hospital insurance, meal vouchers (8 euros), eco vouchers, representation allowance, company mobile phone + subscription, 32 days of vacation and a flex income plan.
  • Sustainable transport: easy access with public transport, 100% reimbursement of public transport fare, bicycle allowance.
  • Flexibility in our open-minded company.
  • Home working (2 days per week)
  • An international environment: projects in over 100 countries worldwide, colleagues of 20 nationalities.

Location: Brussels

Kalkkaai 6 Quai à la Chaux
1000 Brussels

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