Bilal Demir

Senior Software Engineer

12/2025 — Present · 11 mos

Owns the technical side of enterprise Drupal delivery end to end — architecture, backend, DevOps and client communication.

• Migrated 88 Drupal sites from Acquia Search to SearchStax in 6 hours with zero downtime, against an estimated 1.5-2 weeks by hand.
• Built the migration toolkit in TypeScript against SearchStax's undocumented API and Acquia Site Factory, and switched backends blue-green so rollback stayed a single config change.
• Cut Solr traffic from three requests per page view to one by dropping unused Views attachments and folding the load-more query into the first request.
• Added Cache-Control to Views AJAX endpoints so filtered results serve from Fastly, taking response time from 700ms-1.5s down to 30ms.
• Delivered the Drupal 11 upgrade across every site — removed unsupported modules and their config, ran database and config updates, and cleared each status report.
• Rolled out the Key module platform-wide, moving SearchStax Solr and analytics tokens into per-site key files outside the webroot, with migrations that create the files and switch each site over.
• Runs client-facing technical meetings, turning requirements into architecture proposals and delivery plans.

Senior Back-End Developer

01/2023 — 11/2025 · 2 yrs 11 mos

Moved from the .NET team into Drupal delivery, and owned CI/CD for both on GitHub Actions and Azure Pipelines.

• Built and maintained enterprise sites for 20 brands, 14 of them Mars pet-care brands including Pedigree, Whiskas, Sheba and Iams — 7 on Drupal and Acquia, the rest on the older .NET estate.
• Tuned Cloudflare caching, raising cache hit ratio from 82% to 96% and cutting origin requests by roughly 78%.
• Migrated CDN delivery from Cloudflare to Fastly.
• Automated recurring Drupal and Acquia operations, bringing pipeline runtime down from 23 minutes to 5-9.
• Built the DDEV + WSL2 local development setup, cutting environment bootstrap from 30-40 minutes to 5 and first CMS load from 10 minutes to under 1.
• Developed custom blocks for WordPress builds.
• Worked day to day in cloud IDEs — GitHub Codespaces and Acquia Cloud IDE.

Back-End Developer

06/2017 — 12/2022 · 5 yrs 7 mos

Built and maintained .NET MVC applications for enterprise clients, wiring them to internal APIs and databases.

• Developed features with ASP.NET and .NET MVC on an agency portfolio of 150+ client sites, taking requests from per-brand and per-region (EU, US, Asia) stakeholder teams.
• Modelled and queried MSSQL and MySQL databases behind those applications.
• Built Salesforce and OneTrust API integrations.
• Integrated Bazaarvoice and Commerce Connector into commerce sites.
• Developed Sitecore themes and plugins.
• Automated recurring data processing jobs with Node.js.
• Set up AWS CodePipeline deployments and CDN delivery.
• Implemented technical SEO changes on client sites to specifications set by their SEO agencies.
• Presented delivered projects to clients and wrote the accompanying technical documentation.

Q/A Tester

08/2016 — 06/2017 · 11 mos

Tested client web projects before release and kept their content in sync.

• Ran end-user and UI/UX test cycles ahead of every release.
• Handled release-time data entry and content verification.
• Coordinated project tracking between developers and clients.

Senior Software Engineer (Freelance)

Builds and runs a multi-tenant AI workflow platform in Go — backend, DevOps and cloud infrastructure.

• Designed and built a Go modular monolith on Domain-Driven Design, CQRS and hexagonal architecture.
• Developed a DAG-based workflow execution engine with parallel branch processing and a trigger/webhook lifecycle.
• Created a JSON Schema-first executor pattern compatible with LLM tool calling, function calling and Model Context Protocol (MCP).
• Built an MCP server that exposes workflows as callable tools for AI agents.
• Shipped 70+ workflow nodes across 24 third-party services spanning LLM providers, communication platforms, productivity suites and crypto data.
• Implemented multi-tenant infrastructure with organization-level RBAC, credential isolation, an OAuth framework and quota/credit accounting.
• Built subscription and billing flows over three payment providers — Stripe, Paddle and MetaMask, card and on-chain.
• Established Go coding standards and a repeatable module layout — DDD layering with CQRS handlers — that every new integration and module follows.
• Owned the full DevOps pipeline on Docker, nginx and AWS across dev and production environments.

DevOps Engineer (Freelance)

Ran system administration and delivery automation for the whole organization.

• Migrated services from systemd units on Linux servers to Azure Kubernetes, delivered by GitHub Actions and ArgoCD from a dedicated DevOps repository.
• Containerised every service except the legacy ASP.NET application, removing manual release steps.
• Ran day-to-day operations across dev and production — DNS, backups, access control and cluster health.

Full Stack Developer (Freelance)

Built web products end to end for an early-stage startup.

• Created REST APIs with PHP and .NET Core.
• Developed interactive front-ends with Node.js, Vue.js and vanilla JavaScript.
• Shipped car-park products wired to three bank payment gateways — Halkbank, Vakifbank and Yapi Kredi.
• Set up Cloudflare DNS, TLS and caching for the company domains.
• Built Discord bots for community moderation and reporting.