Build APIs with iron-clad confidence

Prevent design drift, slash support tickets and stay compliant - keeping your enterprise clients happy.

Book your API design clarity sprint

Trusted by great engineering teams

René Passmann
"Søren quickly grasped the technical and business context of our project and added value from day one. His strong engineering background and structured thinking made collaboration seamless. Just as important: his clear and confident communication."

René Passmann

CEO, HAV Media

Why great API design matters

Without clear patterns, teams hit roadblocks that stall releases and balloon costs

Lengthy Integration Cycles

Enterprise customers demand custom connectors and bespoke data mappings, stretching your sales-to-revenue timeline by weeks (or even months).

High Maintenance & Incident Rates

Scattered, undocumented endpoints lead to frequent breakages whenever you touch one API - triggering firefights, rolling back releases, and burning scarce engineering hours.

Poor Developer & Partner Experience

Inconsistent naming, missing specs, and no sandbox slow down internal teams and external integrators alike, driving up support tickets and eroding confidence.

Compliance & Security Gaps

Legacy APIs often lack modern auth, rate-limiting, and audit logging, exposing you to regulatory fines and jeopardising contracts with security-sensitive clients.

When API clarity drives results

A unified design spec removes integration roadblocks and lowers support burden so your team can innovate at full speed

Faster Time to Market

Consistent naming, uniform data formats, and clear versioning let teams and partners onboard in days instead of weeks - accelerating demos, proofs of concept, and deal closures.

Reduced Operational Overhead

Standardised error codes, automated tests, and backward-compatible releases slash support tickets and firefighting, freeing engineers to focus on new features rather than patching broken integrations.

Better Developer & Partner Experience

Interactive docs (OpenAPI/Swagger) and sandbox environments empower users to self-serve, cutting support load and turning integration teams into advocates who drive referrals and lower churn.

Your path to API design clarity

Week 1

API Design Clarity Sprint

€7,000

Over 7 days, I'll guide your team through a hands-on sprint to not only audit and enhance your existing APIs, but to co-author a living API Design Framework - think Google's AIP-lite - that you can apply organisation-wide.

Map endpoints and stakeholder needs
Define naming, error handling and security standards
Create branded style guide with governance
Deliver OpenAPI examples and handbook
Book your sprint
Weeks 2-13

Expert Guidance

+ €16,000

Over the next three months, I'll partner with your team to embed your AIP-lite as a living framework - pure consulting to set up checkpoints, align stakeholders and track success, with direct Slack and email support throughout.

Set up governance checkpoints and deprecation processes
Define KPIs and regular health reports
Train internal champions to sustain the framework
Book your sprint
Week 14+

API Design Stewardship

€5,000/mo

Keep your AIP-lite alive and evolving with ongoing, high-level consultancy. I'll review upcoming API proposals, advise on architecture for new features and safeguard consistency across your estate - cancel any time.

Monthly strategic design reviews
Unlimited Slack and email support
Regular audits to prevent pattern drift
Book your sprint
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Designing APIs that scale with your team

Sören Johanson

I've spent my career designing APIs from the ground up, some supporting up to 50 million users globally

From early-stage startups to enterprise-scale platforms, I've designed API architectures that handle everything from rapid prototyping to massive user growth. My approach focuses on building systems that remain maintainable as your team and product evolve.

Whether it's GraphQL backends, REST architectures, or real-time systems, I help teams create APIs that scale technically and organisationally - turning complex design decisions into clear, actionable frameworks your developers can build on.