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Castus Design

Unclaimed Mobile App Development
+441142211906 [email protected]
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About

Castus is a close-knit, highly skilled team of professionals, delivering beautiful digital projects to global and local businesses from our Sheffield office in the UK. Everyone on their team is passionate about what we do, and learning the latest technologies, techniques, and marketplaces comes as second nature to them. They help you develop your online presence and increase your name by revolutionizing the process you run your business and employ your customers.

Last updated May 13, 2026

Services

Mobile App Development Web Development Mobile App Design App Marketing

Client Rating

5.0/5.0
4 reviews
Quality
5.0
Schedule
5.0
Cost
5.0
Communication
5.0
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Client Reviews

5.0/5.0 (4 reviews)
Sign in to Review
Quality
5.0
Schedule
5.0
Cost
5.0
Communication
5.0

Clean web architecture and a practical delivery approach

Ritika Nair / Academic Technology Lead - ClassroomGrid
Verified
May 15, 2026

Project summary: We needed to improve customer self-service while reducing ticket load on our support center. The project covered account management, plan changes, and service notifications.

Good execution with realistic expectations. They did not overpromise, and that made planning much easier on our side. We had one integration issue with a third-party API rate limit that impacted timelines briefly, but they implemented retry handling and monitoring quickly. End result: reliable delivery and a solid foundation for phase two.

PROS

Good domain understanding, thoughtful architecture choices, and clean handoff documentation

CONS

A few UI polish items spilled into post-launch, though core functionality was stable

5.0
Overall
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Communication
Project Type Web Development
Industry Telecommunications
Project Cost $10,000 to $49,999
Duration Sep 2024 – Nov 2024

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We are a mid-sized business in the Telecommunications space, and I lead this function as Academic Technology Lead. I was responsible for evaluating vendors, aligning stakeholders, and ensuring the project delivered measurable operational gains.
What specific problem or business challenge led you to hire this company?
Our main challenge was that existing Telecommunications workflows were fragmented and hard to scale. We needed Web Development support to reduce manual effort, improve reliability, and give teams clearer visibility into day-to-day operations.
What services did the company provide for your project?
They handled discovery, technical planning, implementation, QA, deployment, and post-launch stabilization for Web Development. Scope was phased sensibly, and they were clear about what should ship now versus move to a later release.
Why did you choose this company over other providers you considered?
We shortlisted a few firms, but this team stood out for their Web Development experience and the way they discussed Telecommunications constraints in practical terms. They were transparent about risks and did not overpromise on timelines.
How clearly did the company understand your requirements and business goals?
They understood our requirements well after a structured discovery phase. There were a couple of assumptions we corrected early, but once aligned, execution stayed consistent and traceable against agreed priorities.
How was your overall experience with their communication and project management?
Project management was strong: weekly checkpoints, a shared board, and clear ownership on action items. Response times were generally quick, and when blockers appeared, they surfaced them early with concrete mitigation steps.
Did the company deliver the project on time and within your expected budget?
Most milestones were delivered on time and within the approved budget. We had minor date movement on one integration-heavy stream, but it was communicated in advance and handled without major downstream impact.
What tangible results or business impact have you seen since the project was completed?
Yes. After go-live, we saw better process turnaround times, fewer support escalations, and stronger reporting accuracy. The platform is now a practical part of our daily operations rather than a side tool.
What did you like most about working with this company?
Two things stood out: they were candid about tradeoffs, and they stayed accountable through launch. We also liked that their engineers translated technical decisions into business implications our leadership team could evaluate.
Would you recommend this company to others, and would you work with them again?
Yes, especially for teams needing a dependable Web Development partner in Telecommunications. They are not the cheapest vendor, but they are organized, transparent, and focused on outcomes that hold up in production.

Useful IoT dashboards and better operational visibility

Isabella Rossi / Head of Digital Commerce - Arco Fashion House
Verified
May 15, 2026

Project summary: We needed a learning experience that worked for both live classes and self-paced cohorts. Reporting for instructors and completion tracking for management were both essential.

The engagement was well-run overall. Their team mapped our requirements into a realistic release plan and called out dependencies early, which helped us avoid late surprises. Quality was strong in the core modules, and they handled feedback quickly during UAT. We did need an extra sprint for edge-case behavior around reporting filters, but they owned it and closed it cleanly.

PROS

Reliable QA process, predictable milestones, and transparent status reporting

CONS

Initial discovery could have been shorter; first two weeks felt documentation-heavy

5.0
Overall
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Communication
Project Type IoT Development
Industry Education
Project Cost $150,000 to $499,999
Duration Nov 2024 – Jan 2026

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We are a mid-sized business in the Education space, and I lead this function as Head of Digital Commerce. I was responsible for evaluating vendors, aligning stakeholders, and ensuring the project delivered measurable operational gains.
What specific problem or business challenge led you to hire this company?
Our main challenge was that existing Education workflows were fragmented and hard to scale. We needed IoT Development support to reduce manual effort, improve reliability, and give teams clearer visibility into day-to-day operations.
What services did the company provide for your project?
They handled discovery, technical planning, implementation, QA, deployment, and post-launch stabilization for IoT Development. Scope was phased sensibly, and they were clear about what should ship now versus move to a later release.
Why did you choose this company over other providers you considered?
We shortlisted a few firms, but this team stood out for their IoT Development experience and the way they discussed Education constraints in practical terms. They were transparent about risks and did not overpromise on timelines.
How clearly did the company understand your requirements and business goals?
They understood our requirements well after a structured discovery phase. There were a couple of assumptions we corrected early, but once aligned, execution stayed consistent and traceable against agreed priorities.
How was your overall experience with their communication and project management?
Project management was strong: weekly checkpoints, a shared board, and clear ownership on action items. Response times were generally quick, and when blockers appeared, they surfaced them early with concrete mitigation steps.
Did the company deliver the project on time and within your expected budget?
Most milestones were delivered on time and within the approved budget. We had minor date movement on one integration-heavy stream, but it was communicated in advance and handled without major downstream impact.
What tangible results or business impact have you seen since the project was completed?
Yes. After go-live, we saw better process turnaround times, fewer support escalations, and stronger reporting accuracy. The platform is now a practical part of our daily operations rather than a side tool.
What did you like most about working with this company?
Two things stood out: they were candid about tradeoffs, and they stayed accountable through launch. We also liked that their engineers translated technical decisions into business implications our leadership team could evaluate.
Would you recommend this company to others, and would you work with them again?
Yes, especially for teams needing a dependable IoT Development partner in Education. They are not the cheapest vendor, but they are organized, transparent, and focused on outcomes that hold up in production.

A capable team that balanced speed and quality well

Leila Haddad / VP Product - PayQuor
Verified
May 15, 2026

Project summary: Our project involved replacing legacy workflows with a modern platform while keeping business continuity intact. We prioritized maintainability, adoption, and measurable impact.

We appreciated the balance between technical depth and business communication. Weekly updates were concise, risks were documented, and decisions were explained with tradeoffs rather than jargon. Not everything was perfect on first pass, but iteration cycles were fast and constructive. The final product is stable and has reduced a lot of manual work for our operations team.

PROS

Reliable QA process, predictable milestones, and transparent status reporting

CONS

One third-party integration took longer than expected due to external API constraints

5.0
Overall
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Communication
Project Type Low-Code / No-Code Development
Industry Energy & Utilities
Project Cost $10,000 to $49,999
Duration Aug 2025 – Feb 2026

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We are a mid-sized business in the Energy & Utilities space, and I lead this function as VP Product. I was responsible for evaluating vendors, aligning stakeholders, and ensuring the project delivered measurable operational gains.
What specific problem or business challenge led you to hire this company?
Our main challenge was that existing Energy & Utilities workflows were fragmented and hard to scale. We needed Low-Code / No-Code Development support to reduce manual effort, improve reliability, and give teams clearer visibility into day-to-day operations.
What services did the company provide for your project?
They handled discovery, technical planning, implementation, QA, deployment, and post-launch stabilization for Low-Code / No-Code Development. Scope was phased sensibly, and they were clear about what should ship now versus move to a later release.
Why did you choose this company over other providers you considered?
We shortlisted a few firms, but this team stood out for their Low-Code / No-Code Development experience and the way they discussed Energy & Utilities constraints in practical terms. They were transparent about risks and did not overpromise on timelines.
How clearly did the company understand your requirements and business goals?
They understood our requirements well after a structured discovery phase. There were a couple of assumptions we corrected early, but once aligned, execution stayed consistent and traceable against agreed priorities.
How was your overall experience with their communication and project management?
Project management was strong: weekly checkpoints, a shared board, and clear ownership on action items. Response times were generally quick, and when blockers appeared, they surfaced them early with concrete mitigation steps.
Did the company deliver the project on time and within your expected budget?
Most milestones were delivered on time and within the approved budget. We had minor date movement on one integration-heavy stream, but it was communicated in advance and handled without major downstream impact.
What tangible results or business impact have you seen since the project was completed?
Yes. After go-live, we saw better process turnaround times, fewer support escalations, and stronger reporting accuracy. The platform is now a practical part of our daily operations rather than a side tool.
What did you like most about working with this company?
Two things stood out: they were candid about tradeoffs, and they stayed accountable through launch. We also liked that their engineers translated technical decisions into business implications our leadership team could evaluate.
Would you recommend this company to others, and would you work with them again?
Yes, especially for teams needing a dependable Low-Code / No-Code Development partner in Energy & Utilities. They are not the cheapest vendor, but they are organized, transparent, and focused on outcomes that hold up in production.

Strong data engineering with attention to edge cases

Avery Collins / CEO - CraftDesk SaaS
Verified
May 15, 2026

Project summary: We needed to improve customer self-service while reducing ticket load on our support center. The project covered account management, plan changes, and service notifications.

Their work improved both product quality and team confidence. The codebase is understandable, deployment is less stressful, and we have clearer ownership across modules now. There were a couple of moments where timezone overlap slowed feedback loops, yet they adapted with better async documentation and recordings. Overall, we would work with them again.

PROS

Ability to translate business goals into usable product decisions, not just technical output

CONS

Knowledge transfer for non-technical users needed one extra session beyond the original plan

5.0
Overall
5.0
Quality
5.0
Schedule
5.0
Cost
5.0
Communication
Project Type Data & Analytics
Industry Telecommunications
Project Cost Less than $10,000
Duration Feb 2025 – Jan 2026

Questions & Answers

Please describe your company, your role, and the industry you operate in.
We are a mid-sized business in the Telecommunications space, and I lead this function as CEO. I was responsible for evaluating vendors, aligning stakeholders, and ensuring the project delivered measurable operational gains.
What specific problem or business challenge led you to hire this company?
Our main challenge was that existing Telecommunications workflows were fragmented and hard to scale. We needed Data & Analytics support to reduce manual effort, improve reliability, and give teams clearer visibility into day-to-day operations.
What services did the company provide for your project?
They handled discovery, technical planning, implementation, QA, deployment, and post-launch stabilization for Data & Analytics. Scope was phased sensibly, and they were clear about what should ship now versus move to a later release.
Why did you choose this company over other providers you considered?
We shortlisted a few firms, but this team stood out for their Data & Analytics experience and the way they discussed Telecommunications constraints in practical terms. They were transparent about risks and did not overpromise on timelines.
How clearly did the company understand your requirements and business goals?
They understood our requirements well after a structured discovery phase. There were a couple of assumptions we corrected early, but once aligned, execution stayed consistent and traceable against agreed priorities.
How was your overall experience with their communication and project management?
Project management was strong: weekly checkpoints, a shared board, and clear ownership on action items. Response times were generally quick, and when blockers appeared, they surfaced them early with concrete mitigation steps.
Did the company deliver the project on time and within your expected budget?
Most milestones were delivered on time and within the approved budget. We had minor date movement on one integration-heavy stream, but it was communicated in advance and handled without major downstream impact.
What tangible results or business impact have you seen since the project was completed?
Yes. After go-live, we saw better process turnaround times, fewer support escalations, and stronger reporting accuracy. The platform is now a practical part of our daily operations rather than a side tool.
What did you like most about working with this company?
Two things stood out: they were candid about tradeoffs, and they stayed accountable through launch. We also liked that their engineers translated technical decisions into business implications our leadership team could evaluate.
Would you recommend this company to others, and would you work with them again?
Yes, especially for teams needing a dependable Data & Analytics partner in Telecommunications. They are not the cheapest vendor, but they are organized, transparent, and focused on outcomes that hold up in production.

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