The hard part is preserving what makes the system useful.
A working business application holds more than records and screens. It holds relationships, historical decisions, exceptions and rules that people rely on.
SELECT A PROJECT TO TRACE ITS CONNECTIONSSWIPE TO EXPLORE THE MAP →● ●
01 / FLAGSHIP WORK
ARENA — a backend rebuild with history to preserve.
ARENA is a real-time sports picks platform valuated at $4.2M. A platform with a history of user picks, grading and payouts, it had been running on an unstable backend that was directly damadging the business.
Revenue recovered in the first month after the backend was stabilized.
WHAT CHANGED
Stabilized the backend, improved performance, reduced AWS costs, and migrated critical data without loss—helping the client eliminate recurring failures.
WHAT WAS AT STAKE
The company’s core product, day-to-day operations, $2.2M investment in company, and sensitive user data depended on getting the backend back to a stable state.
WHAT CALIBRE HANDLED
Architecture, roadmap planning, migration planning and implementation, backend engineering, debugging, interaction with outside team, testing and code review.
1M+
Records migrated.
Migration included reconciling over 1M records across users, payments, transactions, lineup data. Data integrity was verified with automated and manual checks, and the migration process was rehearsed before cutover.
1M sensitive user records migrated and reconciled with percision
CLIENT VALIDATION
High standards, carried through to the final details.
“As a developer myself, I set the bar quite high – yet they not only met these standards, but even went a step further when perfecting the final touches of my app. Their professionalism, eagerness to help, and commitment to getting things done made the whole process smooth and enjoyable.”
02 / OPERATIONAL SOFTWARE
Ezypill — software built around recurring pharmacy work.
Ezypill — recurring-order and delivery controls. Cropped from the supplied product screenshot to exclude patient and account details.
RECURRING ORDERDELIVERY SETTINGSOPERATIONAL RECORD
CALIBRE’S ROLEApplication modernization and operational workflows
Calibre modernized an existing Django dashboard used by pharmacies in Western Canada. The application covered patient and order management, recurring orders, search, charts and delivery pricing based on distance and time.
The work connected daily records and recurring actions with the rules used to run them.
“Stefan is great to work with. Super nice and knowledgeable.”
03 / MULTI-ROLE APPLICATION
Reformat Studio — one application, distinct workflows.
CALIBRE’S ROLEArchitecture and development of a multi-tenant SaaS
Designers, clients and managers worked in distinct roles. The platform connected order processing with invoicing, payment-on-file functionality, messaging, notifications and administration.
“They not only met these standards, but even went a step further…”Wojciech Gajda CTO @ Reformat Studio
Reformat Studio — client order workflow.
04 / DOMAIN-SPECIFIC LOGIC
Ceteor Energy Calculator — interdependent inputs, usable outputs.
CALIBRE’S ROLECustom full-stack application development
The calculator was commissioned by CETEOR for the Bosnia Energy Efficiency Project (BEEP), a World Bank-supported programme implemented through the Federal Ministry of Spatial Planning of the Federation of Bosnia and Herzegovina.
The calculator combined location-based GIS data with building and system inputs. It calculated investment, energy use, emissions and annual energy costs, with results available as a PDF.
LOCATION & GIS DATA+BUILDING & SYSTEM INPUTS→CALCULATIONS→PDF RESULTS
“I am extremely satisfied with Stefan's work as a Full Stack Developer. His expertise in both front-end and back-end development has greatly contributed to the success of our projects. Stefan consistently delivers high-quality code, demonstrates excellent problem-solving skills, and maintains effective communication throughout the development process.”
05 / MORE SELECTED WORK
Software shaped around the task.
Stock Analysis
Stock Analysis
Market-data ingestion, financial-document extraction, custom calculations, charts and tables built around a client’s analysis workflow.
DATA INGESTION / DOCUMENTS / CALCULATIONS
“Stefan was very responsive, which helped a lot, especially in cases of emergencies and delays. Stefan was always reachable, even on Sunday evenings, and very willing to help. I really appreciate it—working with him was always smooth and comfortable. Props!”
Stock Screener — custom TSLA chart with indicators and date controls.View full-size chart
Stock Screener
Custom screening and charting tools with notifications, and scheduled data retrieval for the client’s analysis process.
SCREENING / CHARTS / ALERTS
“He has a very good working attitude, constantly researching ways to solve problems. I like that he went above and beyond by thinking of ways to save costs to stick within the budget yet at the same time getting the job done!”
WORKING WITH CALIBRE
Engineering ownership that stays practical.
The same attention to working systems carries into how Calibre scopes and delivers new work.
01Senior engineering involvement
Direct technical responsibility from planning through delivery.
02Control of the system
Customer access to code, infrastructure and operating assets.
03Documented handover
Documentation and a working deployment process another qualified developer can use.
04Clear acceptance
Agreed workflows, integrations and data checks guide readiness.
YOUR NEXT STEP
Bring us the system you’re considering changing.
Calibre can examine whether the economics, workflows and dependencies make replacement worth investigating.
