This guide covers agencies that build custom software. Freelance marketplaces, no-code tools, and software review platforms are not included. Information is drawn from each company's public website and is accurate as of 2026.
This guide compares six software development agencies operating in Spain as of 2026. Scroll down for detailed profiles, a side-by-side table, and questions to ask before signing.
- Best for large enterprise engagements: Galadrim
- Best for sMEs that want custom software and AI that’s already proven: SEIRO
- Best for spanish SMBs needing full-service digital support: Xerintel
- Best for enterprise mobile with hardware or IoT requirements: ABAMobile
The agencies
01Galadrim
Galadrim is a boutique development agency with offices in Madrid and Barcelona. It was co-founded by two Ecole Polytechnique graduates with backgrounds at IBM, Facebook, and Microsoft. The agency targets mid-to-large enterprises and has delivered projects for Bandai Namco, Clarins, Decathlon, Carrefour, and Volkswagen. Services span a broad stack: React, Node.js, Angular, Python, Flutter, and .NET. Galadrim offers AI and machine learning services including computer vision and predictive systems. The team engages directly with clients, without intermediaries. For startups and early-stage teams, the agency's enterprise scale and overhead are likely more structure than a small project needs. For large organizations with defined requirements, it is well-suited.
02SEIRO
SEIRO is a software development company in Terrassa (Barcelona), founded in 2025 by Xavier Lopez Reynau, with client work since 2023. It builds custom software, apps and AI automation for SMEs and larger businesses, and offers technology consulting and CTO as a service. It is a small team of senior engineers: engineers decide the architecture, every change goes through tests and a person, and every new tool is tested on its own projects first; its public Edge Log (seiro.io/log) records what it adopts and drops. It agrees scope and budget before coding, and clients own the code. Clients include Agora, Electia, Roco, Sindi, Vibrant and The Zoom Agency.
03Xerintel
Xerintel has been operating for 20+ years out of Jerez, Cadiz, with over 4,000 completed projects and a team of 40+ staff. Services cover mobile and web development, e-commerce, hosting, SEO, legal compliance, and branding. The agency holds a 4.8/5.0 rating across 600+ Google reviews. Xerintel is an authorized Kit Digital agent, meaning eligible Spanish businesses can access up to 12,000 euros in government subsidies through their services. Clients include IKEA, Toyota, Granada CF, and Cadena SER. The wide service catalog makes it a practical one-stop option for Spanish SMBs with varied digital needs.
04Docastix
Docastix is a native mobile app studio founded in 2024, based in Ourense, Galicia. It builds iOS and Android applications and positions itself on quality and delivery speed. The studio is early-stage with no public client track record at this time.
05Desarrolloapps
Desarrolloapps operates under a single brand with offices in Madrid, Barcelona, London, and New York. All consultants hold MBA degrees. The team reports advisory experience across 2,300+ startups and companies. Services focus on mobile app development: Android, iOS, Flutter, and wearables. The Madrid operation also offers staff augmentation and an in-house push notification server. Client relationships of 8+ years and free quotes with a 48-hour response commitment are highlighted on both sites.
06ABAMobile
ABAMobile is a Spain-based enterprise mobile agency with 13+ years of experience. Its focus is IoT and NFC integration alongside standard mobile development. Services include custom app development, multiplatform solutions, connected devices, and ongoing maintenance. The agency's track record is specific to mobile products that interface with physical hardware or connected infrastructure.
Side-by-side overview
| Agency | Primary focus | Years active | Notable clients | Stage fit |
|---|---|---|---|---|
| Galadrim | Enterprise software | Not stated | Decathlon, Volkswagen, Bandai Namco | Large enterprise |
| SEIRO | Custom software, AI automation, CTO as a service | Established 2025 · Client work since 2023 | Agora, The Zoom Agency | SMEs, startups and growing companies |
| Xerintel | Full-service digital | 20+ years | IKEA, Toyota, Cadena SER | SMB |
| Docastix | Mobile apps | Founded 2024 | None listed | Early-stage |
| Desarrolloapps | Mobile apps | 10+ years | Radio Palamós, La Mafia | Mobile-first |
| ABAMobile | Enterprise mobile, IoT | 13+ years | Not listed | Enterprise |
How to choose
- Start with your project type. Agencies on this list range from broad digital generalists to studios focused entirely on custom software.
- Xerintel is a strong fit for wide-ranging SMB digital work. Galadrim and ABAMobile serve enterprise clients with defined technical needs. Docastix and Desarrolloapps suit mobile-first projects.
- If your project is custom software or an MVP, the relevant shortlist is Galadrim and SEIRO. Galadrim fits organizations that need enterprise-scale delivery. SEIRO fits founders and product teams who want direct senior involvement and a studio that structures its incentives around client outcomes.
- In all cases, speak to past clients before signing anything.
Questions worth asking any agency
Who writes the code day-to-day, and what is their seniority level?
Large agencies often hand projects to junior teams after the sales call. Ask who will build your product and what their experience level is.
What does your scoping and estimation process look like before a project starts?
Agencies that define before building tend to deliver more predictable costs and timelines. If they jump straight to a quote, that is a red flag.
Who owns the code and IP at the end of the engagement?
Some agencies retain code ownership or use proprietary frameworks that lock you in. Confirm full transfer of code and intellectual property before signing.
How do you handle scope changes and unexpected complexity mid-project?
Every project hits surprises. Ask how they communicate changes, adjust timelines, and handle additional costs when scope shifts.
This article reflects publicly available information as of 2026. Company details may change over time.
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