Coworking, Chemistry & Supporting Sustainabilty

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Behind The Scenes with AristEng

Every day, industries churn out massive amounts of waste: organic, chemical, and everything in between. AristEng, an engineering consulting firm, believes that this waste could become the starting point for something valuable.

Headquartered in Luxembourg, AristEng also operates from Stone Soup coworking in Athens. The company was founded in 2021 by Evangelos Delikonstantis and Stavros Theofanidis, two close friends and colleagues with a strong passion for research and dedication to chemical engineering.

team of chemical engineers coworking office

The company specializes in chemical process design, particularly within the framework of the circular economy, waste valorization, and sustainable product development. Their work spans a range of services, including environmental, techno-economic, and social impact assessments, as well as circularity analysis, market research, and business modeling.

“We try to come up with greener processes. Greener process steps that produce something in a more environmentally friendly and economically viable way.”


AristEng operates largely within the framework of European Union-funded projects, collaborating with a wide network of companies, universities, research institutes, and technology end users across Europe. They contribute their expertise through research partnerships in project consortia, proposal writing, and outsourced consultancy to those seeking specialized knowledge.

While the company might be small—currently a team of ten—its impact is growing. With offices already in Luxembourg, Athens, and Kozani. AristEng is scaling up sustainably, step by step, one project at a time.

Turning Waste Streams into Cleaner Energy Solutions

One of AristEng’s recent projects—led by Chemical Engineer Kostas Stergiou —involves forest biomass. Forest biomass, such as wood, enters a pyrolysis reactor to produce bio-oil and other valuable by-products. AristEng’s role is to analyze what should happen to the gas and liquid by-products generated during this process. Rather than letting those go to waste, the team investigates how to valorize them, transforming them into useful resources like electricity, methanol, or even hydrogen.

Of course, this kind of transformation isn’t simple. It requires heat, electricity, and carefully designed systems to ensure the environmental and financial benefits truly outweigh the costs. AristEng performs full life-cycle assessments, helping determine if each innovation is technically feasible, environmentally sound, and economically viable.

“Our job is to find out: Is it technically possible? Is it environmentally better than what we currently do? Is it financially viable?”

Spyros Kymiris from the team is evaluating a new configuration for cooling cycles (used in refrigeration and air conditioning) designed to use less energy and produce fewer emissions. Here again, AristEng provides the environmental, economic, and circularity assessments needed to determine whether the new system could compete with or even replace existing technologies.

Rebecca and Spyros discussing AristEng the sustainable startup

Greener Futures, Pushing Sustainability Forward

Through the team’s expertise and experience in multi-level chemical design and assessment, AristEng plays a crucial role in providing the EU and its partners with the scientific, technical, and business intelligence needed to drive energy transitions. The results of these research projects often feed into policy development, green infrastructure investments, and industrial-scale implementation.

In short, AristEng is helping Europe go green—not just ideologically, but strategically.

sustainable processes

How Coworking Supports Sustainability

We asked Spyros Kyrimis how being based at Stone Soup Coworking supports their work:

“The daily interaction with the welcoming Stone Soup team and fellow coworkers adds a unique energy to our workday. Combined with the comfortable setup and the inspiring view over Athens’ urban landscape, it creates an environment that truly fosters productivity and collaboration.”

One of the great strengths of coworking is its versatility. It’s not built for just one type of company, startup, or individual. Instead, it fosters a flexible, evolving community—making it an ideal environment for sustainability-focused teams like AristEng.

But coworking spaces don’t just support teams working on sustainability—they actively contribute to it. The connection between coworking and sustainability is increasingly clear, as shared workspaces help reduce overall resource consumption, minimize waste, and encourage more efficient use of energy and infrastructure.

coworking community


Zoe Fragou: Redefining Workplace Wellbeing and Culture

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What it means to be an organisational psychologist today


When we asked Zoe what she’s up to at Stone Soup, she opened up and shared the diverse roles an organisational psychologist plays. Her focus includes corporate training, team building, psychometric tests, and especially programs around culture change in the direction of equity, diversity, inclusion, and mental health. Now, her work has grown way beyond that.

Zoe Fragou is the founder of Fragoulous Minds, which she described as more of an ecosystem than a company. “Half the people I work with are artists,” she said, because apart from training, they also produce comics, videos, podcasts, and are even working on a board game about personal development. “Everyone expected me to write a book,” she laughed, “but I said, no—not yet. Let’s make a board game instead.”

Are people happy to be at work?

Zoe pointed out that workplace wellbeing, mental health, and inclusion are finally on the agenda for more and more businesses. But not all of them get it—some just want to “tick the box.” Still, she sees a shift, especially thanks to Gen Z. “They have boundaries,” she said. “They’ll just say, ‘this isn’t for me,’ and leave. And that’s pushed companies to change, because they can’t keep people anymore unless they do better.

The impact of this type of work is measured with tools like pre- and post-intervention tests, retention rates, absenteeism, and how emotionally committed people are to their workplace. There are many ways to measure progress and the wellbeing of workers, but she stressed the importance of asking the simple question:  “Are people happy to be at work?” That feeling matters.

Zoe Fragou giving a talk on inclusion, diversity and mental health.

Zoe’s favorite sessions are the ones that focus on promoting inclusion, especially “because a lot of non-inclusive behavior comes from lack of awareness, not bad intentions.” Also, a growth mindset—helping people believe they can change, no matter where they’re starting from.

The trend she’s not a fan of? Resilience. Not because resilience is bad, but because too many companies use it as an excuse. “They say, ‘You’re not resilient enough,’ instead of taking responsibility for the toxic environment they’re creating,” she said. “It shouldn’t just fall on the employee.”

At the heart of Zoe’s work is the idea that empowerment isn’t a buzzword—it’s a mindset, and one that needs the right environment to grow.

Zoe Fragou's podcast which explores wellbeing, ethical change, inclusion, diversity and mental health.

Being Part of a Coworking Space 

For the team, choosing a private office within a coworking space was a conscious decision. A place like Stone Soup offers the best of both worlds—the privacy of your own space, along with the chance to connect with others and meet people working on a variety of projects.

When it comes to professional circles, Zoe pointed out an unexpected alignment, “I would say it sounds weird, but we vibe more with tech people and marketing people and not so much with people from the mental health sector, although that’s who we are technically, but the way we approach business is closer to tech companies and media companies.” 

Check out Fragoulous Minds work and projects here

Theofilos Petsios from Crash Override on Tech Collaboration and Remote Working

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Getting to know our newest members, we sat down with Theofilos Petsios, who has been a principal engineer with Crash Override since the company’s founding in 2022. We discussed tech collaborations, remote working and the journey of Crash Override.

A Natural Tech Collaboration

After a decade long tenure in the USA completing a PhD in Computer Science at Columbia University, and a short stop in Berlin, Theofilos relocated to Greece and took on a vital role in the NY-based B2B SaaS start-up which is only a couple of months away from launching.

Having worked with John Viega (CEO and Co-Founder) at John’s previous start-up during his time in New York, they happened to cross paths again and join forces on this new project. Both John and Mark Curphey (Co-Founder) are both very well known in the security community, the culture fit and engineering ethos was a perfect match so the decision to collaborate came naturally, as Theofilos shared.

Air tags for code

Air tags for code? Sorted

Founded in 2022, Crash Override has grown to a team of more than twenty, spread across the UK, USA, and Greece. They build tools to help developers understand where their applications are developed, where they live and how they’re deployed—“like air tags for code,” as Theofilos puts it. Initially focused on application security, the team quickly expanded to address broader questions that companies would ask around ownership, development, and deployment of software. This led to the creation of not only a SaaS platform but also a series of open-source projects like ‘Chalk’—a tool to make software lifecycle data accessible to all.

Connecting software

Balancing Remote Work and In-Person Syncs

Crash Override emphasises cross-border collaboration but recognizes the challenges of remote work, especially when time zone differences are involved. “It’s crucial to have an office and for folks to be in the same room” he explained. “There are some things that you cannot really replicate in a virtual environment.” Theofilos stresses the importance of having an office space for in-person interactions, like whiteboarding and spontaneous mentorship, which can’t easily be replicated virtually.

Despite these challenges, Theofilos is optimistic about the team’s ability to adapt, crediting their engineering excellence and collaborative spirit as key strengths that make Crash Override stand out from the crowd. “The technology and foundational things we’re building are really, really cool.” While there are competitors, none are focusing on the kind of visibility Crash Override is offering, and that’s certainly something to brag about, despite Theofilos’s humility.

Life and Networking at Stone Soup

When Theofilos is in Athens, he works from Stone Soup on most days. He loves Stone Soup’s super central location, the lovely terrace and the Athenian feel that the building and décor maintain. “It’s more intimate than larger coworking spaces you find abroad” he stated.

Theofilos recognises the power of networking in his journey and believes it’s particularly important at this early stage of Crash Override. If you see him around our shared spaces or at a community event, don’t hesitate to introduce yourself and say hi!

Check out Crash Override’s blog posts about the security industry here.

From Bristol to Athens: iCOMAT’s Journey in Aerospace and Automotive Technology

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Whether you’re an avid F1 enthusiast or a casual observer, chances are you’ve been mesmerized by the speed and precision of these incredible machines. But have you ever wondered about who is behind such engineering brilliance? We spoke with Giorgos Stamatopoulos, a structural analyst at iCOMAT since 2022, to explore the story of one of Athens’ top funded startup’s and its groundbreaking work in aerospace and automotive technology.

The Spark That Ignited Innovation

It all began in 2017 when Evangelos Zympeloudis, then a postgraduate student in Bristol, envisioned a transformative future for composite manufacturing. Collaborating with his supervisor, he patented a technology that manipulates carbon fibers with precision, steering them without creating defects. This invention laid the foundation for iCOMAT, a company confident to redefine the possibilities of composite materials.

Starting modestly with a small UK team and just one employee in Greece, iCOMAT’s workforce has steadily grown. Giorgos himself was the second team member in Greece, and now the local team is rapidly expanding to keep pace with the company’s growth.

icomat employee working with new state-of-the art technology.

Collaborating with Titans

As Giorgos explains, iCOMAT serves a diverse clientele, ranging from aerospace giants to luxury automotive brands. Their expertise has contributed to components for rockets, satellites, and high-performance cars, including the elusive world of Formula 1. While Giorgos remains tight-lipped about specifics, he hints at exclusive visits to the headquarters of a certain top-tier F1 team. For those outside the field, the impact of iCOMAT’s work boils down to three game-changing benefits: enhanced performance, cost efficiency, and sustainability.

Image with examples of which industries iCOMAT work with: Aerospace, automotive and space.

A Startup Backed by Visionary Investors

Innovation attracts attention, and iCOMAT is no exception. With a staggering €20.13 million in funding, the company ranks 7th among Greece’s top-funded startups according to the Venture Financing Report 2024-2025, Startups in Greece 2024–2025. Velocity Partners, one of their earliest investors, has supported them every step of the way, helping them transform their vision into reality.

The big news? iCOMAT will take its expertise to the next level by producing its designs in-house as they’ve opened their first factory in Gloucester. When asked why the UK was chosen over Greece, Giorgos explained that the complexity of their cutting-edge technology demands specialized knowledge that is currently more accessible in the UK.

A Home at Stone Soup

In Athens, iCOMAT enjoys the collaborative environment of a private office at Stone Soup. Beyond the facilities, they value the dedicated support from Olga and Giorgos, who are always ready to tackle challenges and celebrate milestones. Stone Soup’s community events are a highlight for Giorgos, who fondly recalls the monthly Meet and Drink. An event that aims to bring members together to share ideas and successes.

As the company continues to push boundaries in composite technology, their journey from a university lab in Bristol to global recognition is nothing short of inspiring. With innovation at its core and a team of passionate professionals steering the wheel, iCOMAT is the startup shaping the future of aerospace and automotive technology and engineering—one fiber at a time!

iCOMAT team working at Stone Soup