About Quick Left
Quick Left Inc. is a leading provider of innovative software development services and tools. They work as a comprehensible team sharing ideas & experiences and growing together. Their mission is to provide highest quality apps and games for their customers and to grow as leading mobile app developers. They are one of the best mobile app development company.
Last updated May 13, 2026
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Quick Left Reviews
Write a ReviewMixed reality build that landed exactly where the brief pointed and then went further
Radosław Kowalczyk / Head of Development - Wisła Software Sp zooApr 26, 2026
Project summary: Cross-agency data sharing had been blocked by incompatible systems for four years. A secure integration platform was the prerequisite for every transformation initiative in our roadmap.
The integration layer was the part of the project I was most concerned about going in. Our system landscape is complex, several of the upstream APIs we relied on were poorly documented, and two third-party vendors had a history of unpredictable response times on integration questions. This team managed all of that. They documented what the upstream vendors could not, built resilience into the integration architecture where the upstream behaviour was unreliable, and delivered a solution that works as specified in production. I could not have asked for more.
Architectural decisions designed for longevity rather than just the current brief, thorough automated test coverage, post-launch stability that validated every technical choice made during discovery
Their discovery process is more rigorous than we were accustomed to and required more preparation from our side than we had initially allocated — but the quality of what followed justified every hour of it
Questions & Answers
Analytics foundation that lets us answer attribution questions we had given up asking
Siobhan Gallagher / Chief Technology Officer - Northumbria FinTech LtdApr 06, 2026
Project summary: Regulatory submission timelines required a document management platform that could handle version control, access permissions, and audit trails at a scale our existing tools were not designed for.
The integration layer was the part of the project I was most concerned about going in. Our system landscape is complex, several of the upstream APIs we relied on were poorly documented, and two third-party vendors had a history of unpredictable response times on integration questions. This team managed all of that. They documented what the upstream vendors could not, built resilience into the integration architecture where the upstream behaviour was unreliable, and delivered a solution that works as specified in production. I could not have asked for more.
Delivery timeline that proved achievable rather than optimistic, estimation accuracy that reflected real analysis rather than competitive bidding, scope discipline that prevented the feature creep we had experienced before
The quality of documentation they produce means our team needed to set aside dedicated review time to do it justice — a minor scheduling point rather than a genuine criticism
Questions & Answers
Commerce platform that handled peak-day traffic at twelve times normal load without incident
Takashi Morimoto / Director of IT Strategy - Sakura Digital KKFeb 20, 2026
Project summary: Track-and-trace capability had gone from a differentiator to a table-stakes requirement and our platform had neither. We needed to close the gap before our next enterprise tender cycle.
Six months after go-live our platform is processing three times the transaction volume we specified in the original brief. The architecture choices made during discovery accommodated that growth without remediation work. That is the difference between a team that designs for what you tell them and a team that designs for what you are likely to need. We are in conversation about a Phase 2 engagement and I expect to be using this partnership for several years.
Deep domain knowledge that reduced the discovery overhead significantly, proactive risk identification before issues became incidents, delivery cadence that our stakeholders found reassuring
We underestimated the input required from our subject matter experts during the requirements phase. The team flagged this early but our resource planning did not fully reflect it — our responsibility, not theirs
Questions & Answers
A development partner who treated our roadmap as carefully as their own
Fatima Al-Suwaidi / Head of Digital Strategy - Gulf FinTech HoldingsJan 20, 2026
Project summary: Our mobile app had a 2.9-star average review score. The two themes in every negative review were speed and booking flow complexity — both were solvable with the right engineering partner.
The thing that retrospectively seems most significant is how little drama there was. Complex technology projects tend to accumulate incidents, escalations, and tense conversations. This one did not. Problems were surfaced before they became incidents. Scope changes were handled with process rather than conflict. Risks were managed rather than avoided. That level of maturity is rare in my experience and it made the delivery feel almost effortless from our side, which I know it was not from theirs.
Deep domain knowledge that reduced the discovery overhead significantly, proactive risk identification before issues became incidents, delivery cadence that our stakeholders found reassuring
The engagement was priced at the quality level rather than the budget level. We evaluated the alternatives and concluded that the delta was a reasonable premium for the reduction in delivery risk
Questions & Answers
Cloud architecture that scales perfectly with our growth
Sarah Johnson / CEO - Innovate DigitalJul 07, 2025
Project summary: We required a custom platform that would give us a measurable competitive advantage in our market.
From day one, the team felt like an extension of our own organisation. They immersed themselves in our domain, challenged us to think bigger, and delivered a solution that is both technically sound and strategically valuable. The project came in on time and within budget, which is rare for an engagement of this complexity. We are delighted with the outcome and look forward to a long-term partnership.
Strong engineering skills, clear and consistent communication, flexible and collaborative approach
None — every aspect of the engagement exceeded our expectations
Questions & Answers
DevOps transformation that accelerated our release cycle
Thomas Müller / Engineering Manager - TechHaus GmbHSep 01, 2022
Project summary: The project demanded deep technical expertise and a thorough understanding of our business domain.
The team demonstrated exceptional technical depth throughout every phase of the project. Communication was proactive and transparent — we always knew exactly where things stood. They challenged our assumptions constructively and suggested improvements that made the final product significantly better than our original spec. Delivery was on schedule, the code quality was outstanding, and post-launch support has been prompt and thorough. We could not have asked for a better partner.
Outstanding code quality, thorough documentation, smooth knowledge transfer, excellent post-launch support
Initial onboarding took a couple of extra days, but the team hit full stride very quickly
Questions & Answers
Truly impressed with their expertise and commitment
Carlos Mendez / Digital Director - LatAm DigitalMay 29, 2022
Project summary: We engaged them to build a comprehensive solution addressing our core operational challenges and growth objectives.
The level of professionalism and technical excellence this team brought to our project was remarkable. They managed a complex, multi-stakeholder engagement with ease, kept all parties aligned, and delivered a product that has already exceeded our KPIs. Their attention to detail, willingness to go the extra mile, and genuine care for our success made this one of the best vendor relationships we have had in years.
Outstanding code quality, thorough documentation, smooth knowledge transfer, excellent post-launch support
Minor timezone overlap challenges early on, resolved quickly with async communication
Questions & Answers
Exceeded all expectations — highly recommended
David Chen / VP of Engineering - Global Tech IncApr 05, 2022
Project summary: We required a custom platform that would give us a measurable competitive advantage in our market.
This was the smoothest technology project we have ever run. The team's expertise was evident from the first technical discussion, and their ability to translate complex requirements into elegant solutions is remarkable. They kept us informed at every step, flagged risks early, and delivered a high-quality product that our internal team is proud to maintain. Their ongoing support has been equally impressive.
Strong engineering skills, clear and consistent communication, flexible and collaborative approach
Minor timezone overlap challenges early on, resolved quickly with async communication