Full-Stack Product Engineering
Frontend, backend, integrations, and deployment for web products that need one accountable technical thread.
- React, Next.js, and TypeScript
- APIs, auth, and integrations
- From MVP to production
Senior Fullstack & Platform Engineering
Fullstack Engineering for scalable web products
I build web applications end to end: frontend, backend, AI integrations, APIs, databases, Kubernetes, CI/CD, observability, and runbooks your team can own.
8+ years
full-stack and platform work
5+
products built, migrated, or stabilized
DACH
remote and on-site availability
~ pipeline.yaml
# turtledev / production deploy apiVersion: tekton.dev/v1 kind: PipelineRun spec: stages: - build - test - scan - deploy › build ✓ 1m 42s › test ✓ 3m 08s › scan ✓ 0m 51s › deploy ✓ 2m 16s release: healthy
Cluster health · prod-eu-01
128 Pods · 12 Nodeshealthy
Deploys today14 / 14
p99 latency86ms
Trusted by product, commerce, and platform teams
amplicade
Dynabase
Schäfer Shop
Sparhandy
Avaco
ALDI
Services
Full-stack engineering with production ownership
I build the parts that connect product and operations: user-facing software, APIs, integrations, deployment paths, and operating models teams can keep running.
Backend & API Engineering
Services, data flows, and automation for business logic, integrations, and production visibility.
- TypeScript and Node.js
- PostgreSQL and service design
- OpenAPI and third-party systems
Platform Engineering
Kubernetes, OpenShift, GitOps, and internal developer workflows for teams that need clear platform ownership.
- Kubernetes and OpenShift
- Argo CD and GitOps
- Developer self-service
Cloud Architecture
Cloud architecture and migration work for applications that need clear scaling, cost, and cutover paths.
- GCP, AWS, and Azure
- Terraform foundations
- Migration roadmaps
CI/CD, GitOps & Reliability
Build, release, observability, and security practices that make production changes repeatable.
- Pipeline hardening
- Policy and release gates
- Monitoring and incident readiness
AI Product & Team Enablement
LLM features, agent workflows, team enablement, and AI integrations added to existing software with production constraints in mind.
- LLM and agentic systems
- Chatbots, RAG, and image workflows
- Team training and handover
Approach
Four phases, clear ownership, useful changes within weeks.
Understand
Map product goals, users, teams, constraints, production risks, deployment paths, and the work that slows releases down.
Design
Turn findings into product architecture, an implementation path, a platform plan, and an operating model the team can adopt.
Deliver
Build the critical pieces hands-on: UI, APIs, data flows, integrations, pipelines, platform capabilities, and observability.
Handover
Document decisions, coach maintainers, reduce key-person risk, and leave product and platform in a state the team can own.
Selected Work
Product and platform engagements with shipped results.
Examples of the outcomes I work toward: shipped web products, safer migrations, reliable releases, and systems teams can operate without heroics.
React · Next.js · Azure Kubernetes
Production frontend for an enterprise commerce launch
Built a greenfield customer frontend, connected backend services, integrated third-party APIs, and prepared the containerized production deployment with product and backend stakeholders.
Greenfield
frontend build
Connected
API connections
Ready
production handover
ReactNext.jsTypeScriptDockerAzure Kubernetes
Team activity12 weeks
428
commits
96
deploys
184
reviews
0
incidents
OpenShift · Migration · CI/CD
OpenShift migration for a regulated enterprise platform
Led the technical migration from legacy deployment patterns to an OpenShift foundation with GitOps, policy gates, and repeatable release flows.
Lower
migration risk
Clearer
release ownership
Safer
cutover path
OpenShiftArgo CDGitLab CITerraform
source
main@8f4a2c1
scan
0 critical
build
image signed
policy
opa passed
deploy
blue/green
observe
slo healthy
rollout
100%
gates
SBOMpass
SASTpass
OPApass
cluster-a
cluster-b
registry
argo
GCP · GKE · E-Commerce Migration
Cloud migration for a business-critical web platform
Moved a legacy commerce stack toward GKE with containerized workloads, managed services, Terraform-managed Cloudflare, monitoring, load tests, and a controlled cutover plan.
GKE
target runtime
Mapped
cutover plan
Observed
production signals
GCPGKEKubernetesTerraformPrometheus
SLO burn
0.42x
↓ 63% vs. last month
MTTR
7m
↓ 22m saved
Signal volume12 weeks
-74%
alerts
18
dashboards
12
runbooks
About
Felix Faust, senior engineer for products that need code and production ownership.
I build and modernize web products when teams need someone who can move between frontend, backend, AI capabilities, cloud infrastructure, and operations.
I work between architecture and implementation. I align stakeholders on a credible target state, then build the product features, AI workflows, APIs, deployment paths, Kubernetes/OpenShift foundations, automation, and operating practices needed to reach it. The work should leave your team with software they can extend and run safely.
Full-stack product work
Hands-on frontend, backend, API, integration, and production deployment experience.
Platform-minded engineering
Cloud, Kubernetes/OpenShift, CI/CD, observability, security controls, and clear ownership in the operating model.
Senior stakeholder communication
Technical detail translated into decisions, roadmaps, risks, and tradeoffs leadership can use.
Applied AI enablement
LLM fundamentals, agent workflows, and AI product features explained, integrated, and handed over.
Remote and DACH on-site
Flexible engagement model for audits, implementation support, and longer platform mandates.
Who I work with
One accountable lead, specialist capacity when the project needs it.
You work with me as the accountable technical lead. When the project needs more capacity or specific expertise, I bring in trusted independent specialists for backend, UI/UX, frontend, product design, or implementation support.
Software & platform work
Proscaler
Technology and implementation partner for software and platform projects.
www.proscaler.de/Product, frontend & design
Fuel Media
Digital product and media partner for frontend, design, and web implementation.
fuelmedia.de/Senior freelance network
Independent specialists
UX
FE
FS
A direct network of UI/UX designers and senior full-stack or backend developers I can involve when a project needs specific expertise or more capacity.
Engagement
Budget ranges before we spend time on a poor fit.
I publish engagement ranges so both sides can qualify budget early. Final scope depends on urgency, responsibility, duration, travel, implementation risk, and specialist capacity.
Discovery
Focused review when you need a senior view on architecture, implementation risk, product feasibility, or a migration path before committing budget.
from €3k / review
- Architecture and codebase review
- Risk, effort, and roadmap clarity
- Written findings and next steps
- Can convert into implementation work
Engagement
Multi-week or multi-month mandate as senior full-stack engineer, platform engineer, or technical lead in your team.
€8k-€25k / month
- 2-5 days per week
- Hands-on product, AI, and platform work
- Backend, frontend, cloud, and CI/CD
- Structured handover
- Optional specialist capacity
Stabilization
Time-critical support when a launch, migration, production system, CI/CD setup, or cloud platform needs senior help.
from €6k / week
- Fast technical triage
- Production, implementation, or migration focus
- Clear ownership during the critical phase
- Can become a longer engagement
FAQ
Before we speak.
Short answers to the questions that usually decide whether we should talk.
Are you mainly a DevOps freelancer?+
No. Platform and DevOps are a strong part of my profile, but I also take full-stack product responsibility across frontend, backend, APIs, AI integrations, cloud infrastructure, and production operation.
Can you take implementation responsibility, not only advise?+
Yes. My best engagements combine architecture, hands-on implementation, and team enablement so decisions get tested in product code and operations.
Do you work alone or with a team?+
You work with me as the accountable lead. If a project needs more capacity or specific expertise, I can bring in trusted independent backend, frontend, UI/UX, product, or platform specialists.
Why show ranges instead of exact day rates?+
Exact rates make complex work look easier to compare than it is. Ranges qualify budget early while leaving room for scope, urgency, responsibility, travel, risk, and specialist capacity.
Do you replace internal teams?+
No. I work with teams, close capability gaps, and make handover explicit so the organization needs less external support over time.
What does the first call cost?+
Nothing. For emergencies, I do a quick evaluation first and then get to work. If you need more support afterwards, the emergency week can turn into a longer engagement.
First conversation
Let's talk about your product and platform.
Forty-five minutes, no obligation. We clarify your situation, technical risks, implementation goals, and whether I am the right person to help.
Contact & availability
Emailcontact@turtledev.net
Phone+49 151 151 4 6363
Response< 24 hours
LocationGermany · DACH