Senior engineering for products
that need to ship and scale.

Web, applications, and AI integrations — B2B engagements with clear handover and ownership.

What we deliver

Web engineering

Production-grade web applications: APIs, admin tools, and customer-facing products. Common stacks include Node.js, Python (Django, FastAPI), and C#/.NET on the server; React and modern TypeScript on the client. Focus on security, performance, and maintainability—not buzzwords.

Applications & integrations

Web and desktop applications, internal tools, Slack and messaging integrations, and public APIs. We work the way your team already works: your repos, your environments, and documentation that supports handover.

AI & LLM integration

Practical use of large language models in real products: automation, copilots, and premium features for customers.

  • Tooling and workflows for internal teams
  • Prompt and context design tuned to your domain
  • Function calling, embeddings, and retrieval (vector stores) where they add measurable value

Cloud & data platforms

AWS and Google Cloud: services your product already depends on, wired correctly the first time. Experience with data pipelines, warehousing (e.g. BigQuery, Redshift), containers, and serverless where appropriate.

How we work with leadership teams

Depth you can verify

Senior engineers who have shipped in production—stack depth from backend through frontend and cloud, with references available on request.

Scoped to your outcomes

Engagements are structured around milestones and clear deliverables—whether you need a focused build, integration work, or a longer-term extension of your team.

Transparent collaboration

We integrate with your tools and ceremonies: stand-ups, tickets, and code review—so progress is visible without overhead.

Pragmatic technology choices

We recommend what fits your constraints: existing systems, compliance, budget, and time-to-market— not the trend of the week.

Leadership

Hasan YILMAZ

Founder · Senior full-stack engineer · B.Sc. Computer Engineering, METU (2015)

~9 years building production systems for product companies; recent focus on data platforms, internal tools, Slack integrations, and LLM-backed features.

Résumé (PDF) · Portfolio

Background

  • Backend: C#/.NET, Node.js, Python; SQL (PostgreSQL, MSSQL, MySQL) and document stores (MongoDB, Firebase).
  • Frontend: React, Angular, TypeScript.
  • Cloud & data: AWS (S3, Lambda, EKS, ECS, Redshift) and Google Cloud (including BigQuery).
  • Platform: Docker, Kubernetes, Kafka, RabbitMQ; microservices and event-driven patterns.

Selected work

Scroll sideways to browse. Use tags to narrow the list.

Client references

References

Aircall

Aircall logo

A telecommunication company for VoIP solutions.

Turing

Turing logo

A global IT company for outsourcing solutions.

Start a conversation

Share a short brief: stack, timeline, and what “done” looks like. We typically reply within one business day.

How to reach us

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  • Senior execution
  • Clear scope & handover
  • AWS & Google Cloud
Office Kadıköy, Istanbul

Frequently Asked Questions

Straight answers on how we work, deliver, and bill—no fine print gymnastics.

We ship production systems across common B2B stacks—for example C#/.NET, Node.js, and Python; React, Angular, and TypeScript; SQL and document databases; Docker and Kubernetes; messaging (e.g. Kafka, RabbitMQ). On cloud we work primarily on AWS and Google Cloud, including data platforms such as BigQuery and Redshift where your product needs them.

Most work is defined in a statement of work: clear outcomes, milestones, or a bounded phase of delivery. Structure follows the problem—whether that is milestone-based delivery, a short discovery followed by build, or time and materials with a capped budget. We align on cadence, access, and acceptance criteria before writing code.

Most often we work in your accounts and tools—Git hosting, CI, ticketing, and chat—so access, security, and integrations match how your team already operates. If a greenfield prototype is faster in an isolated space first, we can agree that up front and then transfer cleanly into your org.

Exact assignment is spelled out in the contract. In typical B2B engagements you receive the codebase and rights you need to run and extend the product; we do not hold back a separate “vendor copy” or claim ongoing ownership of your product IP.

Yes. NDAs, background checks, acceptable-use rules, and your infosec checklist are normal when we embed in your environment. Tell us what your legal and security teams require early so paperwork does not block the technical start.

Reego Software is headquartered in Türkiye. For distributed clients we agree a predictable overlap window (reviews, pairing, releases) and use async updates the rest of the time so decisions are not blocked by the clock.

SWIFT to a local bank account and Wise are the usual rails. Where it makes sense for both parties, we can discuss other settlement options—including, when explicitly agreed, cryptocurrency on major networks.