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Federico Tejedor LlorenteSoftware Engineer
Freelance engineering

Work with me

You get a senior engineer who has shipped products used by thousands of people every day, working directly with you. No agency layers, no account managers, no handoffs to someone junior.

Services

What I can do for you

Four ways I usually help, though most projects mix a couple of them.

  • Full stack product development

    From an empty repository to a deployed product. I design the architecture, build the interface and the services behind it, and hand over something your team can keep running.

    What you get

    • Next.js or React Native application
    • Typed API and database design
    • CI/CD pipeline and cloud infrastructure
    • Documentation and handover session
  • AI and LLM integration

    Adding real, measurable AI to an existing product: retrieval over your own data, agents that complete tasks, or MCP servers that expose your product to ChatGPT and Claude.

    What you get

    • RAG pipeline over your content
    • MCP server or tool-calling layer
    • Evaluation suite with quality metrics
    • Cost and latency budget
  • Migrations and performance

    Modernising a codebase without stopping delivery. Pages Router to App Router, legacy stacks to React, or simply making a slow site fast again.

    What you get

    • Technical audit with prioritised findings
    • Incremental migration plan
    • Core Web Vitals improvements
    • Regression test coverage
  • Architecture consulting

    A second opinion before you commit. Architecture reviews, technology choices, hiring support and mentoring for teams that are growing faster than their processes.

    What you get

    • Architecture review document
    • Scalability and cost recommendations
    • Code standards and review process
    • Team mentoring sessions
Process

How a project runs

Predictable, transparent and built around showing you real progress every week.

  1. Step 01

    Discovery call

    A free 30-minute conversation about the problem, the constraints and what success looks like. If I am not the right person, I will tell you and point you somewhere better.

  2. Step 02

    Proposal and scope

    Within a few days you get a written proposal: scope, milestones, timeline and a fixed price or a clear rate. No surprises halfway through.

  3. Step 03

    Build in the open

    Weekly demos, a shared board and direct access to me. You see progress continuously instead of waiting for a big reveal at the end.

  4. Step 04

    Launch and handover

    Deployment, documentation and a walkthrough with your team, plus a support window after launch so nothing is left hanging.

Why me

What you are actually hiring

Concrete results from the last five years, not adjectives.

  • Proven at scale

    Took part in the Next.js App Router migration for German apparel e-commerce platforms serving thousands of shoppers a day, with zero customer-facing incidents.

  • AI that ships

    Helped build and deploy the MCP server behind the Eventbrite ChatGPT App using AWS CDK, connecting a real product to real assistants.

  • Quality you can measure

    Helped cut warning and error logs in Kibana by over 50% and raise accessibility scores to WCAG AA across an entire storefront.

  • A full stack partner

    Comfortable from React and React Native through Node.js, NestJS and Python, down to AWS infrastructure and CI/CD.

Questions

Frequently asked

The things people usually ask before we start.

Next step

Tell me about your project

Fill in the form and I will get back to you within 1–2 business days with honest feedback about whether I can help.

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