Case Studies & Architecture

Real Operational Challenges. Engineering Solutions. Measurable Impact.

Anonymized case studies from our enterprise modernizations, real-time data pipelines, and proprietary multi-tenant SaaS products highlighting architectural decisions, challenges, and measurable results.

EXPERIENCE20+ YearsOracle & enterprise software mastery
DAILY FOOTPRINT60+ ClientsActive SaaS operations across 20+ cities
HIGH AVAILABILITY99.98%5-year verified SaaS production uptime
EXECUTION RATE100%Zero data loss on mission-critical cutovers
01 / Finance & PensionNational Pension & Investment Financial Enterprise
4.5 Months (Phased Zero-Disruption Rollout)

Modernizing Legacy Oracle Forms into High-Performance Oracle APEX

15-year-old desktop Forms architecture migrated into responsive browser-native APEX while preserving all PL/SQL business packages.

The Operational Challenge

A core operational system built 15 years ago on Oracle Forms suffered from outdated Java Applet dependencies and zero mobile compatibility. Requiring local desktop clients burdened branch offices with heavy maintenance and licensing costs. Because the core system contained hundreds of thousands of lines of mission-critical PL/SQL packages, a greenfield rewrite in an unrelated language carried unacceptable operational risk.

Engineering Approach & Architecture

We engineered a direct modernization roadmap to Oracle APEX, preserving existing database packages and security policies while replacing client interfaces with clean, responsive browser screens. We implemented corporate Single Sign-On (SSO) and REST bridges. Following phased User Acceptance Testing (UAT) and a 3-week parallel run, the enterprise cut over to production with zero downtime.

Measurable Outcomes & ROI
%60+Licensing & Support Savings
4 KatFaster Screen Load Latency
150+Branch Users on Modern Web
%100Business Logic Preserved
  • Completely eliminated Java Applet and local desktop workstation dependencies.
  • Empowered 150+ branch associates to access operational forms via any modern browser.
  • Zero business logic re-implementation risk; minimized user retraining overhead.
  • Delivered over 60% recurring savings in third-party client licensing and desk-side support.
Tech Stack:Oracle APEXOracle Database 19cPL/SQLRESTful Web ServicesJavaScriptLDAP SSO
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02 / Capital Markets & Wealth ManagementLicensed Brokerage & Asset Management Firm
3 Months

Real-Time Multi-Source Data Architecture & Executive KPI Dashboard

Fragmented trade execution data unified across microservices into sub-second C-Suite reporting telemetry.

The Operational Challenge

Trade volume, margin requirements, account exposure, and commission logs were fragmented across disparate legacy databases and trading feeds. Producing daily risk and portfolio balance sheets required 3+ hours of manual Excel wrangling every evening, introducing operational delays and risk calculation blind spots during high-volatility trading sessions.

Engineering Approach & Architecture

We engineered a high-throughput event processing pipeline unifying Oracle and PostgreSQL data sources with real-time exchange feeds. We built a role-gated, reactive executive dashboard leveraging Next.js and high-frequency analytical queries. Automated risk monitors were implemented to dispatch instant alerts when margin thresholds approach regulatory limits.

Measurable Outcomes & ROI
3 Saat → 90snDaily Closeout Processing
CanlıReal-Time Risk Telemetry
%100Manual Spreadsheets Replaced
OtomatikAutomated Exposure Alerts
  • Reduced end-of-day portfolio reconciliation latency from 3 hours to under 90 seconds.
  • Equipped risk officers and C-Suite executives with real-time exposure and P&L tracking during live markets.
  • Completely eliminated human copy-paste errors and discrepancy investigations.
  • Streamlined regulatory compliance audits with instant, immutable historic trade reports.
Tech Stack:Next.jsTypeScriptOracle DatabasePostgreSQLTailwind CSSRechartsRedis
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03 / Enterprise Infrastructure & Supply ChainMulti-Facility Industrial & Logistics Enterprise
6 Weeks (Audit, Staging & Zero-Disruption Cutover)

Zero-Downtime Oracle 11g to 19c LTS Migration & Performance Tuning

3 TB mission-critical transactional database migrated to Oracle 19c within a 25-minute maintenance window with 45% query speedup.

The Operational Challenge

A 3 TB enterprise production database on legacy Oracle 11g faced mounting security compliance risks and heavy I/O contention. Heavy lock wait times degraded billing throughput during morning dispatch hours. Because factory logistics ran round-the-clock, standard multi-hour migration downtime was strictly prohibited.

Engineering Approach & Architecture

We performed deep SQL execution plan audits and system schema optimization. On hardened hardware, we provisioned Oracle 19c LTS and synchronized production data in real time via Oracle Data Guard physical standby replication. During an off-peak 25-minute cutover window, role reversal was executed with zero data loss. Post-migration SQL Plan Baselines and index tuning resolved lingering execution bottlenecks.

Measurable Outcomes & ROI
%45Query Response Speedup
25 DakikaTotal Cutover Window
%0Data Loss (Zero Loss)
7/24 HAHigh-Availability Uptime
  • Eliminated transaction locking bottlenecks; heavy analytical reports finish 45% faster.
  • Achieved full corporate cybersecurity compliance on an actively supported Oracle 19c LTS platform.
  • Configured continuous standby disaster recovery (DR) capable of failover in under 2 minutes.
  • Delivered a flawless 3 TB database migration with zero transaction rollback and zero data loss.
Tech Stack:Oracle Database 19cOracle Data GuardOracle Enterprise LinuxAWR & ASH TuningRMANPL/SQL
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04 / Education Tech (EdTech & SaaS)Proprietary SaaS Product (60+ Academies across 20+ Cities)
Live in Continuous Production Since 2022 (5th Year)

Derslic: A Resilient Multi-Tenant SaaS Platform Scaling for 5+ Years

Unifying class schedules, attendance tracking, lesson package hours, and tuition billing into one cloud architecture.

The Operational Challenge

Music, dance, and creative arts academies managed 1-on-1 private lesson schedules, make-up sessions, instructor payroll, and tuition payments via paper binders and disconnected spreadsheets. Double-booking studios caused parent frustration, while calculating instructor compensation consumed days of administrative overhead every month.

Engineering Approach & Architecture

We architected a scalable multi-tenant SaaS platform unifying every academy workflow under one roof. The engine coordinates complex private/group timetables, make-up slot reservation, automated instructor payroll calculation, online payments via iyzico/Paratika, and instant automated SMS reminders to parents and students.

Measurable Outcomes & ROI
60+ KurumAcademies in 20+ Cities
100.000+Monthly Managed Lessons
%99.985-Year Verified Uptime
%70Administrative Time Saved
  • Powers the daily administrative operations of 60+ creative arts academies across 20+ Turkish provinces.
  • Reduced academy administrators' weekly timetable and bookkeeping overhead by over 70%.
  • Boosted timely tuition collection to 94% through automated payment reminders and virtual POS links.
  • Demonstrates Sardunya's end-to-end capability in architecting, releasing, and scaling mission-critical SaaS platforms.
Tech Stack:Next.jsReactPostgreSQLPrisma ORMTypeScriptİyzicoParatikaVerimor SMS API
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