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The best Cross Platform Development Firms in London

Scalara Labs logo

Scalara Labs

Verified

Engineering the infrastructure behind your next stage of growth

Scalara Labs is your strategic engineering partner for the design & build of scalable, reliable digital products and platforms. We deliver architecture-led solutions across backend systems, real-time data, web and mobile applications, cloud-native infrastructure, browser-based gaming and AI enabled workflows.

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4.8 (10 review)
20 employees
Dubai, United Arab Emirates
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Timspark logo

Timspark

Verified

Core Teams for complex builds—custom software, AI/ML, data, cloud, and DevOps.

Timspark is a custom software partner that goes beyond headcount. We curate pre-built Core Teams—architects, engineers, QA, and DevOps with clear ownership—to deliver measurable outcomes, not just CVs. Clients choose us to build modern web and mobile apps, move to cloud-native architectures, implement AI/ML and data platforms, and optimize CI/CD—plus Salesforce integrations and QA. Recent wins span microlearning platforms, cybersecurity scale-ups, IoT telemetry, BIM/point-cloud automation, and pharma analytics. Whether you need team augmentation or end-to-end delivery, we plug in quickly, de-risk execution, and help you scale with confidence.

Services: Custom Software • Team Augmentation • Dedicated/Core Teams • Mobile • Cloud & DevOps • AI/ML & Data • Salesforce • QA & Automation.

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5.0 (3 review)
50 employees
London, United Kingdom
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U1CORE logo

U1CORE

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U1CORE — A product studio for multi-sided platforms. Marketplaces, exchanges, auctions, fundraising

YOUR PARTNER TO BUILD MULTI-SIDED PLATFORMS

U1CORE is a product studio for the products where buyers, sellers, and operators meet, transact, and trust each other.

Marketplaces, exchanges, auction systems, fundraising platforms, and operational CRMs with multi-role logic.

🔔 Book a Free Call:

https://calendly.com/hello-u1core/30min

or visit our website - https://www.u1core.com/

OUR SERVICES:

Product Design — UI/UX, design systems, prototyping, user testing, platform-native patterns for marketplaces, auctions, exchanges, and donation flows

Product Engineering — React, Next.js, Vue on the front; Node.js, Python, .NET on the back; mobile, payment integrations, multi-role architecture, admin tooling, DevOps

Discovery & Platform Strategy — Cold-start strategy, trust and safety architecture, take-rate modeling, MVP scoping, UX audits, platform mechanics workshops

Custom Development — Marketing sites and landing pages for platform companies, paired with the product engagement

Why U1CORE:

We pick a lane. Marketplaces, exchanges, auctions, donation platforms and almost nothing else. Founders come to us because we already know how their product breaks.

One team, no relay race. Senior designers and engineers on the same project, kickoff to launch. The thing you ship is the thing we built nothing lost in handoff to a second studio.

Built for the day it gets used. Multi-role flows, payments, admin tooling, infrastructure that holds up at peak load. We design for the brief and engineer for the day after.

Receipts. $720M+ processed through one platform. Millions of listings on another.

Our work has been recognised by CSS Design Awards (2× Site of the Day, 4× Best UX, 4× Best UI, 4× Best Innovation, 4× Special Kudos), Orpetron, TOP 10 Design Company in Dribbble!

More than 300 clients have trusted us with their products.

If your product has multiple types of users exchanging real value, and getting the platform right changes outcomes — let's talk.

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5.0 (6 review)
40 employees
London, United Kingdom
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Debut Infotech logo

Debut Infotech

Verified

Results, Not Promises

Debut Infotech is an AI-augmented blockchain and software development company helping organizations across financial services, healthcare, supply chain, and digital platforms build systems that perform reliably in complex, regulated environments. Founded in 2011 and blockchain-native since 2015, the company brings engineering discipline and technology depth to enterprises moving from fragmented pilots to production-grade systems.

With delivery centers across the USA, UK, Canada, and India, Debut Infotech combines regional market understanding with globally distributed engineering capability — enabling clients to move with speed, consistency, and governance.

Service areas:

  1. Artificial intelligence and generative AI — Enterprise LLM integration, AI agent development, retrieval-augmented generation (RAG) pipelines, predictive analytics, computer vision, and intelligent process automation embedded at the system architecture level.
  2. Blockchain and Web3 development — Smart contract engineering, DeFi protocol development, real world asset (RWA) tokenization, cryptocurrency exchange infrastructure, and enterprise blockchain on Hyperledger Fabric and Corda.
  3. Mobile application development — Native iOS, Android, and cross-platform applications (React Native, Flutter) architected for AI integration, enterprise-grade security, and sustained performance under production load.
  4. Web and software development — Full-stack web platforms, SaaS products, and enterprise software systems engineered API-first, designed for long-term maintainability and organizational scale

Proven Delivery:

  • $62M+ raised across client platforms including Ifinca, IntegraLedger, Everledger, and TĒM
  • 90% customer success score across enterprise engagements
  • 15 years of enterprise software delivery
  • Fortune 500 clients and high-growth startups across 25+ industry verticals
  • 50–249 engineers spanning AI, blockchain, and software disciplines

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5.0 (7 review)
150 employees
Chandigarh, India
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TRIARE logo

TRIARE

Verified

TRIARE unlocks IT potential of YOUR business

TRIARE is a WEB and MOBILE software development company based in Europe. We are delighted to offer our services as your long-term partner, taking all technical matters off your shoulders and allowing you to focus on your business development.

YOU WILL GET:

In-house team. Work with a dedicated team that is 100% focused on your product and located in the same office.

Efficiency & transparency, as our process is based on Scrum methodology and managed by certified Scrum Masters.

Fast result. Working with us, you will get the first result in 1 week.

High quality, as TRIARE has well-established processes of software development and experienced specialists.

Full cycle development. Our company covers all stages of development, handling everything from Discovery and prototyping to Design, development, and maintenance.

IP rights. From the very beginning, you are the only owner of the intellectual property of your project materials: source code, design, documentation, etc.

Warranty period will be provided for your system for free.

ASPECTS OF OUR MINDSET:

- Focused on results. We are focused on the result of your business with an understanding of the real goals and KPIs that our team should achieve.

- Solution Provider. It means that we always come to you with solutions, not with questions. We take all technical aspects of the project off your shoulders, allowing you to focus on the marketing and business strategies.

- We go the extra mile. Being a proactive company, we always think and take a step ahead.

TECHNOLOGIES WE USE:

- Mobile app development: Kotlin, Java, Swift, Objective-C.

- Cross-platform development: Flutter, React Native.

- Web frameworks: Node.JS, React.JS, PHP, Ruby on Rails.

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5.0 (11 review)
50 employees
Cherkasy, Ukraine
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Evangelist Apps logo

Evangelist Apps

Verified

UK’s Leading AI, Software & Mobile App Agency

At Evangelist Apps, we don’t just build apps, we craft intelligent mobile solutions tailored to business needs. With over two decades of experience, we guide our clients with best practices, smart architecture, and forward-thinking UX/UI.

Our team has delivered high-performance apps for some of the world’s most trusted brands including British Airways, BBC, UBS, KLM Airlines, Virgin Money, Channel 4, Hastens, and BMJ. From concept to launch, we deliver quality, agility, and cost-efficiency every time.

BTW, we are also an official Microsoft Cloud AI Partner!

Whether you’re a startup or an enterprise, we help bring your ideas to life with pixel-perfect design, robust engineering, and unmatched reliability.

Why Choose Us

• 23+ years of mobile expertise

• A seasoned, cross-functional app development team

• Agile delivery with regular builds and updates

• Cost-effective offshore development without quality compromise

• End-to-end ownership from discovery to deployment

Our Expertise

• Native iOS and Android apps

• Cross-platform apps using React Native & Flutter

• Clean, user-focused UX/UI design

• Scalable backend & API integrations

• Dedicated teams for QA, DevOps, and Project Management

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4.9 (6 review)
50 employees
Hampshire, United Kingdom
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Supercharge logo

Supercharge

Verified

we build AI‑enabled digital products

At Supercharge, we create game-changing digital products positively impacting millions of lives around the world. As an end-to-end digital agency we support you through the entire life of your product, from strategy and design through data and AI-empowered development to ongoing support.

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(0 review)
232 employees
Amsterdam, Netherlands
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Athlon Technology logo

Athlon Technology

Verified

Digital experiences that drive growth

Athlon Technology is a digital design and software development agency, founded in 2006 and based in Sofia, Bulgaria. For nearly two decades, we have partnered with organisations like Deutsche Bank, PwC, Amazon, Zebra Technologies, NRG, and Fundpath to untangle complex problems and build software that works in the real world, not just on paper.

Our work spans three areas:

  • Product Design & Strategy - UX/UI design, design research, service design, and scalable design systems
  • Engineering - Cross-platform software development, mobile and web applications, system integration, and technical architecture
  • Digital Production Hub - A centralized production capability with dedicated producers managing end-to-end delivery, ensuring alignment across design, development, and business objectives

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5.0 (4 review)
65 employees
Greater London, United Kingdom
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TechGropse Pvt. Ltd. logo

TechGropse Pvt. Ltd.

Verified

Next-Gen Apps for Next-Gen User

TechGropse is a leading mobile app development company headquartered in Dubai with a prominent global presence in the UAE, USA & India. Established in 2015, we transform innovative ideas into reality, becoming a go-to name for businesses seeking stunning, high-performance mobile applications.

Vision and Mission We help businesses grow by developing stunning mobile apps that users love. Our mission is to deliver high-quality, personalized solutions that meet the unique needs of every global client as a dedicated partner in your success.

What We Do & Strategic Services TechGropse offers end-to-end services to meet all your digital transformation needs:

Custom Mobile App & Software Development

Expert UI/UX Design & Prototyping

Cross-Platform & Native App Development

Maintenance and Support

AI Chatbot Development

Machine Learning & AI Implementation (Agentic AI)

Advanced Cloud Computing & DevOps

Innovative IoT Development

Industry Expertise We excel in developing apps for: Healthcare, FinTech, Logistics, Construction, Retail, Ecommerce, Energy, Insurance, Travel, Electric Vehicles (EV), and Real Estate.

Why Partner With Us Using a stack like React, Node.js, Python, and Flutter, our client-focused team is committed to quality, timely delivery, and affordable pricing. We build long-term relationships through collaboration.

Connect With Our Global Offices:

USA Office: +1 267 327 4760

Dubai HQ: +971 527 984 766

Email: info@techgropse.com

Visit: https://www.techgropse.com/contact

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5.0 (105 review)
100 employees
Dubai, United Arab Emirates
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Mindrops logo

Mindrops

Verified

Transforming Ideas into Intelligent Solutions

Mindrops is a global IT and AI solutions company delivering full-service expertise in website development, mobile app development, artificial intelligence, machine learning, cloud services, and digital marketing. With offices in the USA, UK, Belgium, and India, we empower startups, SMEs, and enterprises with high-quality, scalable, and cost-effective digital transformation solutions.

Our expert team combines deep AI and data science capabilities with cutting-edge technologies like React, Node.js, Angular, Python, and Java to build intelligent, adaptive, and impactful digital products. From predictive analytics and NLP-driven chatbots to AI-powered automation and personalization engines, we integrate machine learning into applications that drive measurable business growth.

Beyond AI, we specialize in custom web development, e-commerce platforms, native and hybrid mobile apps, SEO & PPC, and cloud infrastructure (AWS, Azure, GCP).

From ideation to launch and continuous optimization, Mindrops follows an agile, transparent process to turn your digital vision into reality—smarter, faster, and future-ready.

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4.8 (25 review)
100 employees
Grimbergen, Belgium
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M3.agency logo

M3.agency

Verified

Momentum Moves Markets

At M3.agency, we're a leading digital-first integrated marketing agency offering Creative, Digital Marketing, Web Design & Media Buying services.

5.0 (2 review)
65 employees
Greater London, United Kingdom
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CAMELSOFT LLC logo

CAMELSOFT LLC

Verified

CAMELSOFT YOUR PARTNER IN YOUR DIGITAL TRANSFORMATION JOURNEY

CAMELSOFT is a full-service company that specializes in IT solutions and digitization. We help entrepreneurs and businesses market their ideas and turn them into real brands. We work with a dedicated team of experts in the field who prioritize customer needs and ensure that we meet and exceed customer expectations.

go to our complete profile. : https://www.behance.net/camelsoft

visite our website: https://www.camel-soft.com

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5.0 (3 review)
12 employees
Sousse, Tunisia
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DBETA logo

DBETA

Verified

We engineer high-performance websites as structured systems—not pages.

We are a London-based digital engineering consultancy specialising in scalable, high-performance websites built for modern search and AI-driven discovery.

Unlike traditional agencies, we don’t start with design.

We start with structure, logic, and long-term performance.

Every project is built on our proprietary framework — Dbeta Bones — developed through dedicated R&D to deliver faster build cycles (weeks, not months), reduced reliance on CMS platforms, and high-speed, low-bloat performance. We also embed machine-readable architecture, ensuring your website is understood by both search engines and AI systems.

The result is not just a well-designed website, but a technically resilient, scalable system that compounds in value over time.

What makes us different

Most agencies build pages. We build systems.

Our work is grounded in Structural Strategy — defining how your services, content, and proof connect before anything is designed. This creates clear user journeys, stronger authority signals, better search visibility, and long-term maintainability.

We also implement a machine-legible data layer (AIDI), ensuring your digital presence is structured for modern discovery.

How we work

  • Audit & Discovery — identify risks and opportunities
  • Architectural Blueprint — define structure and system logic
  • Engineering & Build — deploy using Dbeta Bones
  • Validation & QA — performance and accessibility testing
  • Ongoing Evolution — continuous improvement without structural decay

Who we’re best for

We work with organisations that see their website as a core business asset, need long-term scalability, and value performance, structure, and clarity.

We’re not the right fit for quick, low-cost or template-based projects.

Results

Faster builds, reduced maintenance, stronger search visibility, and a system that scales with your business.

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5.0 (7 review)
11 employees
Greater London, United Kingdom
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Rubric logo

Rubric

Verified

IT Quality Project Delivered

We're a Mauritian powerhouse, blending over 17 years of experience with agile, remote teams in Madagascar. Our passion is crafting stunning web and mobile solutions from the ground up. We don't just build software; we engineer perfection through rigorous testing. By harnessing the power of open-source technologies and infusing every project with AI, we deliver optimal, future-proof solutions for leading industries like banking, insurance, and HR. You get competitive rates, and we get the thrill of transforming your vision into reality.

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(0 review)
40 employees
London, United Kingdom
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Azuki logo

Azuki

Verified

We build bespoke web and mobile solutions that fit your organisation perfectly.

We build bespoke online products and mobile apps to help your business grow.

We make it our business to understand yours.

We're small, friendly and based in Cambridge, UK.

Got an idea we can help deliver? A challenge you need help solving? You've just found your team.

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5.0 (6 review)
8 employees
Hardwick, United Kingdom
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ClickaByte logo

ClickaByte

Verified

Fast websites & bespoke software that ship outcomes, not just code.

ClickaByte is a small, hands-on web and software studio based near Sevenoaks, working with clients across Kent, the UK and worldwide. We design and build fast, responsive websites, web apps, and mobile experiences that look sharp and feel effortless to use.

Alongside websites and apps, we develop custom software and integrations tailored to each client - from internal tools and dashboards to full platforms, automations and AI-powered features such as chatbots and smart search. Our work spans fully bespoke and fully hand coded websites, WordPress sites (with custom built themes and plugins), and custom builds (React/Next.js, Python, Swift and more), always with clean architecture, security and performance in mind.

Every project starts with a focused kickoff to understand your goals, constraints and budget. We then move quickly into prototypes and demo links so you can see real progress early, followed by iterative development with clear timelines and a single point of contact. Launch isn’t the end: we also provide hosting, monitoring, SEO and ongoing support to keep your site or product fast, reliable and evolving with your business.

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5.0 (1 review)
1 employee
Orpington, United Kingdom
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Pagepro logo

Pagepro

Verified

Next.js, Expo & Sanity Development Agency

What sets us apart in the world of technology agencies is our focused expertise. We are a narrow, highly experienced Next.js, Expo & Sanity agency.

This specialization allows us to delve deep into these technologies, staying at the forefront of industry trends and innovations. When you choose us, you're investing in results and the deliverables that drive your business forward.

We're aiming to deliver 2,000 Frictionless Sprints by 2030.

Frictionless Development is the essence of everything we do. It means streamlining the entire development process to guarantee that it operates smoothly, efficiently, and effectively.

It entails crafting an environment in which every aspect of your project, from its initial conception to its final deployment, is carefully planned, executed, and monitored to keep interruptions and setbacks to a minimum.

Our awards:

  • We're Clutch Top Sanity and Webflow Developer 2025
  • We're Clutch Top Next.js and React Native Developer 2024
  • We're named Forbes Diamond Poland 2024

Our Tech Stack:

  • Next.js
  • Expo
  • Sanity
  • React
  • React Native
  • Node.js
  • TypeScript
  • Headless CMSes

Hire us for:

  • App Development (Web and Mobile)
  • Migration from Native Apps to React Native
  • CMS Migrations
  • MVP Development
  • Further Existing App Development
  • Technical Discovery (Technical feasibility)
  • Post-Release Support
  • React / React Native Code Audit
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5.0 (6 review)
40 employees
Bialystok, Poland
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Centrelocus logo

Centrelocus

Verified

“Feel confident to hold our promising digital hands.”

Centrelocus is a globally recognized digital transformation and product engineering company helping startups, enterprises, governments, and fast-growing businesses build scalable digital ecosystems across the world.

With 8+ years of industry experience and clients spanning 18+ countries, we specialize in delivering next-generation solutions in Artificial Intelligence, Blockchain, Web Platforms, Mobile Applications, Cloud Engineering, Enterprise Software, and Game Development.

We are certified with internationally recognized ISO standards, reflecting our strong commitment to data security, high-quality service delivery, and responsible business practices. Our certifications include ISO 27001:2022 for information security, ISO 9001:2015 for quality management, and ISO 14001:2015 for efficient and sustainable operational practices.

We are proud to be the official technology vendor partner of Morgan State University and have collaborated with globally respected innovators, including Harvard Medical Science alumni-led initiatives and academic professionals from Howard University.

From AI-powered platforms and SaaS products to enterprise applications and immersive digital experiences, Centrelocus transforms ambitious ideas into impactful technology solutions.

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(0 review)
50 employees
Greater London, United Kingdom
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VTS Software Ltd logo

VTS Software Ltd

Verified

WE ARE VTS, A BOUTIQUE SOFTWARE ENGINEERING CONSULTANCY FIRM.

VTS Software is an international technology team that plans, designs and enables bespoke software development and highly secure network solutions. We employ some of the brightest minds in the business to build innovative database systems, desktop- and web-applications and secure network systems, which not only meet our clients' every need today, but anticipate and prepare for the challenges of tomorrow.

At VTS every project is a truly collaborative effort. We pride ourselves on building rewarding and enduring partnerships with our clients to support their strategic business goals – often offering support and advice way beyond that of our contractual remit. We have an excellent track record for providing mission critical applications and secure network solutions for the healthcare and financial sectors and are experienced at delivering cost-effective core systems for smaller organisations.

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(0 review)
30 employees
Greater Manchester, United Kingdom
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Arch logo

Arch

Verified

We turn bold ideas into better services.

We are an award-winning consultancy that designs & builds software across web, mobile, and back-office for leading brands and start-ups. Our mission is to build longstanding partnerships to help deliver disruptive technology into the B2B & B2C marketplace.

Founded in 2005, we have built a reputation for high quality, innovative products that will offer your users the best possible experience. We’re excited by what we do and continue to seek new challenges in all areas of design and development.

Arch specialises in the design, development, and websites, apps and business systems. We also support development in e-commerce, intranet, and e-learning, as well as complex database-driven Content Management Systems and CRM systems for individuals, the public sector and the business community.

As a company, we’ve grown steadily over 20 years, and today we are proud to have an ever-expanding team of passionate and talented individuals, combining a wealth of knowledge and years of experience with approachability and down-to-earth guidance.

We love the challenge, and always happy to chat about new projects and ideas.

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(0 review)
10 employees
Tyne and Wear, United Kingdom
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