Senior backend engineers and tech leads with 7+ years across energy, fintech, blockchain and security. We built and operate WebGuardian, a production monitoring and security platform, and take on contract work: backend systems in Java and Go, web applications, cloud infrastructure, and the monitoring and security layer most teams postpone.
Reply within one business day · No sales calls, just an engineer
Everything below is work we have already done for our own product or for clients. You get the same people, not a bench.
Microservices in Java (Spring Boot) or Go with PostgreSQL. REST, GraphQL and gRPC APIs, WebSocket for live data, Kafka or RabbitMQ where events need to flow. CQRS and event sourcing when the domain calls for it. Schedulers, retries, idempotency, the boring parts done right.
Dashboards and admin panels in Vue 3 or React with real-time updates, charts, maps, role-based access, dark mode. Built to be maintained by your team afterwards.
Kubernetes and Docker on GCP, AWS or Azure. Terraform, CI/CD with GitHub Actions, GitLab CI or Jenkins, secret management, blue-green deployments, TLS automation. Observability with Prometheus, Grafana and Loki so you see problems before users do.
Uptime monitoring, alert routing, incident workflows, status pages. Vulnerability scanning, CVE tracking, SIEM forwarding, compliance reporting. Cross-platform endpoint agents for Windows, Linux and macOS with remote lifecycle and GDPR-grade data destruction. This is our core domain.
Stripe subscriptions and webhooks, OAuth (Google, GitHub), SMS via Twilio, bots and notifications for Slack, Discord, Teams and Telegram. Third-party APIs wired in properly, with retries and audit trails.
AI automation & agent workflows →
Code and architecture review, performance investigation, security hardening, taking over a codebase the original team left behind. Written findings with file-level references, then the fixes.
Pick the model that matches how much you know about the scope. All three are B2B with invoicing, a written agreement, and your ownership of everything we produce.
For evolving scope or embedding with your team. Weekly timesheet, weekly demo, cancel with two weeks' notice.
A fixed number of days per month reserved for you. Predictable cost, priority response, ideal for ongoing product work or operating a system we built.
Written specification, fixed price, milestone payments. Best when you know exactly what you need and want the risk on our side.
Rates depend on scope and duration. Ask, and you get a number within a business day.
We work in your stack when it makes sense. This is the one we know best because it runs our own product.
Selected engagements from the last seven years. Client names available on request.
WebGuardian Dev is led by Yoan Sredkov, a senior backend engineer and technical lead with 7+ years designing, building and operating backend systems across energy trading, payments, receivables, blockchain, GDPR endpoint security and infrastructure. He has owned delivery end to end, from requirements and architecture through implementation, deployment and production troubleshooting, while leading teams of five to nine engineers and working directly with client CTOs and product owners.
We are based in Bulgaria, inside the EU, and work remotely with clients across Europe. Every engagement is handled directly by the engineers who do the work. There is no account manager between you and the code. We build our own product with the same standards we bring to yours: written architecture, reviewed code, observability from day one, and an honest answer when something is a bad idea.
LLM pipelines with quality gates, coding agents wired to GitHub, GitLab, Bitbucket and Jira, n8n orchestration, and one-click approvals over Discord, Slack or Telegram. Runs in your cloud with guardrails and an audit trail.
What we buildAbout to ship, buy, fund or inherit a codebase? A senior engineer reads it and tells you in writing what will break, what is exposed, and what each fix costs. File-level findings, three to seven days, fixed price.
See the report formatBuilt with Cursor, Lovable, Bolt, v0 or Replit and now breaking under real users? We take over AI-generated codebases, close the security holes, fix the crashes in order of risk, and hand back a system your team can run.
How a rescue worksA few sentences is enough: the problem, the stack, and the timeline. An engineer replies within one business day.
NDA on request · References available · CV on request