AWS Cloud Application Development, Integration and Modernisation

Green Custard is an Advanced AWS Partner specialising in bespoke cloud-native software development, system integration, and modernisation programmes. We help businesses design, build, and evolve the applications and platforms they need to operate effectively delivered on AWS, built to last, and tailored to your specific context.

This offering is for organisations that need more than off-the-shelf software. Whether you're building something new, replacing something old, connecting systems that don't talk to each other, or modernising infrastructure that's holding you back we bring the architecture, engineering, and delivery experience to move with confidence.

Custom Cloud-Native Application Development

We design and build bespoke web and mobile applications hosted on AWS. From early-stage MVPs to full production platforms, we work with you to define requirements, architect the right solution, and deliver working software incrementally. Our applications are built for scalability, security, and long-term maintainability using the right AWS services for the job rather than forcing a one-size-fits-all approach.

System Integration & API Development

Most organisations have existing systems. ERP platforms, CRMs, third-party data providers, legacy databases that need to work together. We design and implement robust integration layers that connect your tools and data sources cleanly and reliably. Whether that means building new APIs, consuming third-party APIs, or orchestrating complex data flows across systems, we ensure your architecture fits together without fragility or duplication.

Cloud Migration & Modernisation

Moving to AWS or making better use of it requires more than a lift-and-shift. We work with organisations to assess their current estate, define a modernisation roadmap, and execute migrations that improve resilience, reduce cost, and unlock new capability. We draw on AWS best practices and our experience across Well-Architected Reviews to ensure your infrastructure is production-ready and strategically sound.

Data Platforms, Dashboards & Analytics

Data is only valuable when people can act on it. We build data pipelines, warehouses, and visualisation layers that surface the right information to the right people. Using services like Amazon RDS, Amazon QuickSight, and purpose-built analytics architectures, we help organisations move from raw data to actionable insight whether for internal operations, customer-facing reporting, or executive decision-making.

MVP Development & Architecture Advisory

For startups or teams launching new products, speed and technical quality both matter. We help you make the right architectural decisions early avoiding the traps that create technical debt down the line while still moving fast enough to test your assumptions. We can take you from concept to working prototype, and from prototype to a scalable production system.

We don't believe in prescriptive delivery frameworks or oversized project teams. Every engagement begins with a thorough discovery phase to understand your business context, constraints, and goals. From there, we define a clear scope, work iteratively, and communicate openly throughout. We are pragmatic engineers. We use AWS services where they provide genuine value, and we avoid unnecessary complexity. Our code is clean, documented, and handed over properly so your team (or ours) can maintain it confidently after we're done.

We work with a wide range of organisations from scaling startups building their first production platform, to established enterprises modernising legacy systems or launching new digital products. Our clients span sectors including commodities trading, manufacturing, media, sustainability, professional services, and the public sector. What they have in common is a need for reliable, experienced engineering partners who can be trusted to deliver, not just to quote.

• Advanced AWS Partner with proven delivery experience across cloud application development, integration, and modernisation
• Strong track record across a diverse portfolio of AWS-hosted applications and platforms
• Transparent, collaborative engagement style with regular checkpoints and clear documentation
• Based in the UK, working with clients across multiple sectors and geographies

If you're looking to build something new on AWS, connect systems that aren't working together, or modernise a platform that's limiting your growth we'd like to hear from you.