Independent software engineering · UK
Architecture, engineering and technical problem solving for businesses that build software needing to remain reliable, maintainable and adaptable.
Direct technical ownership — from architecture to implementation.
Intelligent systems. Elegant design.
Capabilities
Four areas of practice, one accountable engineer. Problems are solved with structure, not with a stack — the technology below each area is the means, not the message.
Designing boundaries, interfaces, data flows and system structure before complexity becomes expensive.
Production software across backend, frontend and infrastructure — built for maintainability and operational clarity.
Untangling existing systems, replacing fragile components and introducing better foundations incrementally.
Deterministic execution systems and AI-assisted workflows built around real operational requirements.
Describe the problem, not the solution. A conversation is cheap; a wrong architecture is expensive.
Talk it throughSelected work
Evidence over marketing: the problems, constraints and structures behind systems designed and built in professional engagements and ongoing products.
A training business ran courses, quoting, payments and learner communication across scattered tools and spreadsheets.
Modular multi-module system (HMVC), Stripe & GoCardless payments, email notifications, an interactive process flow that unlocks course parts as learners progress.
One platform owning the full operational lifecycle — bookings, payments, content and learner progress.
High-volume error events with ambiguous grouping — cascade detection needed deterministic semantics, not heuristics.
Rust core for the business logic, a thin TypeScript API layer, hierarchical logging with controlled grouping. Foundation of the SurfLogs product.
Deterministic error grouping at scale — a developer-facing product in active development.
Heterogeneous survey and research data across many sources — analysts needed exploration, not static reports.
Scheduled backfill from MySQL to Elasticsearch, a generic dashboard data contract, drag-and-drop analytics builder with extensive filtering — ECharts, Recharts, choropleth and chord visualisations.
An exploration toolchain that turned data collection into decisions, owned end-to-end by one engineering team.
Representative work from professional engagements and products in development. Case details available under NDA.
R&D · Energy systems
An energy platform for solar battery systems — monitoring, control and optimisation with lifespan prediction, built on the practice's own UI runtime. Designed for households and businesses that want real numbers, not estimates.
Approach
You engage the engineer responsible for architecture and implementation — no sales layer, no account manager, no handoffs.
Requirements and constraints captured precisely — scope deliberately kept where direct ownership is an advantage.
Boundaries, interfaces and data flows decided before complexity gets expensive. Structure first, code second.
Production engineering with testing, monitoring and verified backups. No partial solutions — if it can run two ways, both are handled.
Maintenance, monitoring and support — systems that remain understandable to whoever maintains them later.
Built for direct ownership. Projects are deliberately kept within a scope where one accountable engineer is an advantage: architecture, implementation and technical decisions stay connected rather than passing through organisational layers. Where a project needs additional specialist capacity, architecture and technical direction remain clearly defined while extra implementation capacity can be introduced.
About
DelfinFlow is the independent engineering practice of Dominik — software engineer and architect with 10+ years building production systems across backend, frontend and infrastructure.
The practice combines engineering with formal teaching experience (four years, college level). That background shapes the architecture: systems should be understandable not only to their original author, but to the people who will maintain them later.
Away from client work: open-source libraries (prutill,state-radar, singleton-registry), Web Components (ShadowKit), and ongoing research in Rust/GTK, game engines and simulation.
Rust · Python · Node.js
TypeScript · React · PHP · JAMstack
PostgreSQL · Elasticsearch · ECharts
Linux · Docker · Jenkins · systemd
Contact
A straight answer and a clear proposal — usually within one working day. Fully digital and online-delivered — UK-based, working with clients across the UK and Europe.
hello@delfinflow.devNot sure whether it fits? The best-suited list in the approach is a good start — a conversation is cheap.