JetSer. Web partner for
design and digital strategy

Web identity that matches your brand.
Digital strategy that grows your business.

Website of Construverty displayed on a laptop.

Construverty

Construction

Barcelona

Residential housing developer in the Barcelona metropolitan area and the Costa Dorada.

Website of Seki displayed on a mobile phone.

Public health

Seki

Berlin

European platform for vaccine awareness, aimed at families, healthcare professionals and researchers.

Steel industry

UNESID

Madrid

Business association representing the interests of the Spanish steel sector before national and European institutions.

DeepPlants

Climate tech

Rome

Startup founded at La Sapienza University of Rome, developing deep learning algorithms to fight climate change.

VariedForms

Luxury interiors

London

High-end bathroom and kitchen fixtures manufacturer, with finishes in marble, metal and noble materials.

Tech consulting

InfaPartner

Prague

Data and analytics consultancy focused on regulated industries: banking, insurance, pharma and telecoms.

Analytica Investor

Finance & investment

Vancouver

Research and financial news firm guiding investors in mining, metals, energy and crypto markets.

REMAX

Corporate real estate

EU

Global real estate network for buying, selling and growing professionally in the sector.

Paper industry

Mimcord

Barcelona

European leader in the manufacturing of threads and paper products, offering sustainable alternatives across multiple industries.

Science & innovation

Future Insight

Frankfurt

Scientific association connecting researchers, innovators and Nobel Prize laureates to shape a better future.

Corporate Energies

Renewable energy

Berlin

International holding specialised in the planning, financing and construction of renewable energy plants.

Gas industrial

Gas industry

Madrid

Business association advocating for competitive and efficient gas access for Spanish industry.

BCN Clinic

Aesthetic medicine

Barcelona

Aesthetic medicine and surgery clinic specialised in facial, body and hair treatments.

Offline marketing

Scamp

Barcelona

Agency specialised in the production and international distribution of direct mail marketing campaigns.

KEA Advisory

Financial consulting

Malaga

Financial consultancy specialised in modelling, analysis and strategic advisory for businesses and entrepreneurs.

Services

Web design & development

Websites that reflect your brand identity, connect with your audience and guide visitors to take action. Built to be scalable and fully manageable by your team.

SEO & strategy

Technical optimisation for search engines and AI, content marketing to grow, and link building to build authority. Organic visibility that compounds over time.

Ad campaigns

Google, LinkedIn and Instagram campaigns focused on attracting qualified leads and optimised for maximum return on investment.

Email marketing & CRM

Covering every stage of the funnel, from cold audiences to warm leads. Newsletter integration to nurture your audience and CRM setup for sales follow-up.

Why JetSer

Skin in the game. Every single project.

Agencies move on to the next client. AI tools don’t care when something goes wrong. Working with a dedicated freelancer means someone who takes your project personally — not just delivering what was agreed, but actively looking for ways to add maximum value. Always reachable, always invested.

Branding and marketing, perfectly balanced

Pure creatives chase detail and originality, but lose sight of profitability. Pure marketers control the numbers, but forget to build lasting differentiation. The approach here combines expertise in both worlds to bring maximum value to every project. No expensive designs that end up with no traffic, no wasted budgets on visibility that doesn’t convert.

Efficient, scalable systems — no technical lock-in

No Frankenstein websites stitched together with 50 plugins that break every week. No 100% AI-built sites where you have to buy credits for every small change. The work is built on WordPress and a proprietary toolkit refined year after year — delivering tailored, scalable, self-manageable websites. Performance, SEO, security and legal compliance are all covered, so both the client and I can sleep well at night.

Let's talk about your project!

Hey, I’m Sergio! Web designer and digital strategist for businesses across Europe. I specialise in the combination many companies and agencies value: premium design with growth strategy.

If you think your business needs a visual refresh or an expansion plan, let’s have a no-strings-attached conversation. I’d love to help.

Fill this form and i'll get back to you shortly

Fill this form and i'll get back to you shortly