AGENCY LIST

Xtremis

Barcelona, Catalonia, Spain
Visit xtremis.es

Bespoke applications, cloud architecture, and generative AI secured through to production

Xtremis, based in Barcelona, builds custom software, SEO-first web portals, and native or hybrid mobile apps for enterprise clients including Arval, Sabadell, GasNatural, and Vueling. The work spans application development through IT consulting, with technology decisions grounded in an analysis of each client's legacy infrastructure and corporate requirements before a line of code is written.

Delivery covers cloud architecture across AWS, Azure, and GCP alongside generative AI and cognitive agents built to redefine existing workflows. Security runs through the same pipeline rather than as an afterthought: penetration testing, WAF, and devsecops enablement sit alongside development, with production releases pushed via Kubernetes and AWS in an automated, secured process described as armored protection for critical infrastructure.

Xtremis cites a 72-hour turnaround from idea to working prototype, along with internal figures of 10x more code produced per engineer, zero team turnover, and zero inherited technical debt on projects it takes on.

25
YEARS IN BUSINESS
3
SERVICES

Capabilities

Category

Custom Software Development

Services

Agency details

Team size
51-200 people
Founded
2001 (25 years)

About this agency on Agency List

Xtremis holds an Agency List Score of 95 out of 100.

That score is higher than 85% of the 36,920 agencies Agency List has assessed so far.

The Agency List Score measures how well an agency documents its work in public: named clients, quantified outcomes, and whether those outcomes are attributed to the agency rather than to the client.

It does not measure client satisfaction, price, or availability.

How the Agency List Score is measured

Assessment date

Agency List assessed Xtremis in September 2026, reading 4 pages published on xtremis.es.

The score reflects what Xtremis had published by that date; anything published since has not been read.

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