// Founder of Didivor Teknoloji — one of Turkey's leading software firms
Founder of Didivor Teknoloji — one of Turkey's leading software firms — and one of the country's most experienced Senior Full Stack engineers. Deep expertise in distributed systems, cloud-native architectures and end-to-end product engineering. I lead a 10-person team designing, building and scaling high-performance platforms across frontend, backend, mobile and infrastructure layers, with a strong focus on system design, reliability engineering and platform architecture — serving enterprise clients in fintech, defense, telecom and energy.
Production systems designed and delivered end-to-end across fintech, defense, telco, e-commerce, energy, healthtech, mobility and government.
Open to distributed-systems consulting, architecture engagements and selective product partnerships through Didivor Teknoloji.
Didivor Teknoloji Sanayi ve Ticaret Ltd. Şti. is an Istanbul-based enterprise software company serving clients in fintech, defense, telecom, energy, retail and healthcare with end-to-end custom software development, mobile app development, web-based enterprise systems and cloud architecture services.
Led by founder and principal engineer Yavuz Ayhan Önder, our 10-engineer team designs, builds and operates scalable, secure and high-performance systems. With 15+ years of production experience, an architecture portfolio that has served 120M+ end users, and a target availability standard of 99.99%, we position ourselves not as just another "code shop" but as a long-term technology partner accountable for the technical sustainability of your products.
The biggest pitfall companies face when looking for a software company in Istanbul is choosing without understanding the difference between teams that "write code" and teams that "engineer products". Didivor proves that difference to enterprise clients not with slogans but with architectural decisions, performance targets (p99 latency, MTTR, error budgets), auditable code-quality metrics, and post-delivery SRE processes — that's what makes us a genuinely professional software firm.
A holistic engineering offering that covers strategy, architecture, development, deployment and operations under one roof. Each service is backed by domain experience, production scale and auditable delivery metrics.
Scalable, sustainable custom software built around your enterprise processes. Domain-driven design, hexagonal architecture, test-first delivery — from architecture to production, code quality to SRE, all end-to-end.
Native (Swift, Kotlin) and cross-platform (Flutter, React Native) iOS / Android apps. App Store and Google Play release management, A/B testing and analytics-driven growth.
Kubernetes, microservice and event-driven architectures on AWS, GCP and Azure. CI/CD, GitOps, infrastructure-as-code, observability (OpenTelemetry, Prometheus, Grafana) and SLO-driven operations.
High-performance enterprise websites, customer panels and B2B portals built on Next.js, React and Vue. Core Web Vitals, multi-language and SEO-first architecture to outpace competitors digitally.
High-volume payment switches, KYC/AML flows, card management systems, e-wallets and regulation-compliant (PCI-DSS, KVKK, BDDK) backend infrastructures. Production experience in Türkiye and EMEA.
Streaming pipelines (Kafka, Flink), data lakehouse architectures (Iceberg, Delta), ML model integration, RAG and LLM-powered enterprise assistants. Data governance and KVKK / GDPR-compliant processing.
Architecture reviews, code reviews, performance analysis, technical leadership and team-building consulting. CTO-as-a-Service and fractional engineering leadership models, including post-investment technical due diligence.
6–12 week MVPs for pre-seed and seed-stage startups. Investor-grade demo quality, scalable architectural foundation and clean codebase your next team can take over.
Gradual modernization of monoliths and legacy COBOL / PHP / older Java codebases. Strangler-fig patterns, dual-writes and zero-downtime data migration to transform without disrupting business continuity.
Eight criteria that enterprise buyers actually use to pick a software partner — and our measurable answer to each.
Our entire team consists of senior engineers with 5+ years of experience. No "training juniors on your dollar" model.
Founder-level accountability: not just shipping code and walking away — being there after the product goes live too.
A team that has built systems serving 120M+ users. We make today's decisions so that tomorrow's 10× growth doesn't break you.
Weekly demos, open metric dashboards, code access from day one, line-item billing. No surprises.
KVKK, PCI-DSS and ISO 27001 requirements are first-day architectural decisions, not features bolted on later.
You own the code, the repository and the documentation. Even if you swap teams tomorrow, the system is fully transferable.
All documentation, ADRs and code comments in both Turkish and English — ready for international audit.
For critical production systems: 24/7 on-call, 15-minute response SLA and a monthly SLO report. No "we'll get back to you ASAP".
A toolset focused on production-proven technologies, not hype. Selected per project — never forced.
A 5-stage, auditable engagement from first call to post-launch operations. Every stage has tangible deliverables.
Business goals, user segments, constraints and regulatory requirements. Output: architecture brief + technical PRD.
System architecture, data model, API contracts, security threat model, UI/UX prototype. Output: ADR set + Figma.
Two-week sprints, weekly demos, continuous integration. Output: working software + automated test suite.
Load testing, security audit, gradual rollout (canary, blue-green). Output: production system + runbook.
SRE support, performance tuning, new feature work, knowledge transfer. SLA-backed continuous support.
Vertical domains where we've delivered systems at production scale — fluent in their regulation, performance and operational nuances.
Payment switches, card management, KYC/AML, open banking APIs, BDDK compliance.
Command-and-control systems, secure communications, geospatial data, airborne platform software.
OSS/BSS, fulfillment systems, 5G network orchestration, provisioning at million-subscriber scale.
SCADA integrations, smart-grid management, EV charging operator platforms, OCPP.
Headless commerce, OMS/WMS, personalization engines, checkout infrastructure, ERP integrations.
HIS integrations, e-prescription, telehealth, KVKK and HIPAA-compliant patient data systems.
TMS, WMS, route optimization, real-time vehicle tracking, warehouse automation.
e-Identity, digital identity verification, public portal integrations, qualified e-signature.
LMS, live classroom infrastructure, exam security, content management and assessment platforms.
Calling yourself "the best software company" is easy; the difference is in details. Here is how we differ on what enterprise buyers actually evaluate.
| Criterion | Didivor Teknoloji | Typical agency |
|---|---|---|
| Team seniority | 100% senior (5+ yrs) | Mostly junior, partial outsourcing |
| Architecture records (ADR) | Every decision documented | Usually missing |
| Test coverage | 85%+ on critical paths | "If we have time" |
| Production SLOs | Numeric targets + monthly report | "It works, that's enough" |
| Code ownership | Repo + IP fully yours | Partial license models common |
| Handover | Runbook + training for your team | "We'll figure it out later" |
| Compliance (KVKK, PCI-DSS) | Architectural from day one | Patched in afterward |
| Post-launch support | 24/7 on-call with SLA | "Call us if you need anything" |
Honest answers to what enterprise buyers actually ask when shortlisting an Istanbul-based software partner.
"Best" is relative; the right firm for you is one that has shipped production-proven systems in your domain, has a high average team seniority, documents its architectural decisions and stays around for post-launch operations. Look past marketing slogans — focus on reference project scale, production SLOs, code-quality metrics and handover practices.
Didivor Teknoloji is transparent on each of these: we share reference projects, ADRs and production metrics in the first call.
Most mobile app firms focus only on "shipping the app"; backend, observability, scale and release management come as afterthoughts. We treat mobile as an end-to-end system: backend, data flow, push infrastructure, A/B testing, analytics, crash reporting and store optimization — all from one partner.
We have production experience in both native (Swift, Kotlin) and cross-platform (Flutter, React Native) — recommending the right one for your case, not forcing a default.
There is no official ranking authority. Practical proxies for engineering quality include the production scale of systems designed, the difficulty of problems solved, open-source contributions, teams trained, and how long architectural decisions remain in production.
Didivor's founder Yavuz Ayhan Önder is a Senior Full Stack Developer with 15+ years of production experience, 30+ critical systems delivered across fintech / defense / telecom and architectures serving 120M+ end users. We back that claim not with slogans, but with measurable outcomes (p99 latency, SLO attainment, MTTR, scale factor).
Cost depends on three variables: scope (feature count, integrations), quality targets (SLA, regulation, performance) and timeline. For enterprise projects we usually recommend "T&M with cap" (time + materials, capped) instead of fixed-bid; in real life scope is never 100% certain upfront, and fixed-bid silently degrades quality.
The first call includes a free scope outline and an estimated budget range.
You do — the code, repository, documentation and architectural records are all yours. This is explicit in the contract. You can swap us out tomorrow and the system is fully transferable; we don't believe in vendor lock-in.
No. Our HQ is in Istanbul, but we serve enterprise clients across all of Türkiye (Ankara, Izmir, Bursa, Antalya and beyond) and EMEA. Our team is remote-first; for engagements that require on-site presence in Anatolia we run online + scheduled in-person visits.
Yes — this is one of our most-requested services. We modernize legacy PHP, .NET Framework, Java EE, COBOL or hard-to-maintain monoliths gradually using the strangler-fig pattern. Zero-downtime, dual-write strategy and data-consistency guarantees keep business running. Step one is always a technical audit and a modernization roadmap.
KVKK, GDPR and PCI-DSS requirements are not "checkbox compliance" for us — they are first-class citizens in data-flow diagrams, architectural decisions and test suites. Data minimization, encryption (at-rest + in-transit), access control (RBAC/ABAC), audit logs and retention policies are foundational. When needed we operate on ISO 27001-certified infrastructure providers.
Didivor Teknoloji is a 10-engineer software firm. Depending on scope we assign a 2–6 person team: tech lead, backend, frontend/mobile, DevOps and QA. Even with a single engineer dedicated to your engagement, the firm's architecture, code-review and process support stand behind them — that is our fundamental difference from a freelancer.
Typical flow: discovery call within 1 week, scope & proposal in week 2, kickoff in weeks 3–4. For critical / urgent projects this can compress to 5 business days, but we don't push the team beyond healthy capacity — sustainable delivery is policy.
HQ is in Istanbul, but we serve enterprise clients across all of Türkiye via a remote-first model. For engagements requiring regular on-site presence in Anatolia, we run a tri-weekly site-visit cadence.
We work with funded technology companies across the EMEA region — particularly in Germany, the Netherlands, the UK, the UAE and Saudi Arabia — under a parallel English / Turkish communication model.
Free 30-minute discovery call · NDA-ready · Reply within 24 hours.