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Diogo Seca · Co-founder & CTO, Swytch

I build machine learning systems for electric fleets.

I'm co-founder and CTO of Swytch, which schedules charging for commercial electric vans. Before that I built the models behind Konetik, which Quartix PLC bought in 2023.

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Diogo Seca, smiling, in a warmly lit room — Diogo Seca Porto

Swytch

Charging schedules for electric van fleets, so every van is ready for its shift without going over the depot's power limit.

Co-founder & CTO

A seven-day plan · illustration

Local timePorto

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Porto, PortugalSame time zone as London

Konetik

Models that told companies which of their vehicles could go electric. Quartix PLC bought the company in 2023 and I stayed on to hand the work over.

BJJ Graph

An interactive map of Brazilian Jiu-Jitsu positions and the moves between them. The source code is public.

Not Investment Advice

A parody investing blog written entirely by a language model, built in a couple of days as an experiment.

notinvestmentadvice.ai

Writing

About

Software engineer and machine learning researcher, based in Porto.

I started out writing trading algorithms for clients, then did machine learning research at INESC TEC, mostly on time series. For the last few years I've worked on electric fleets, first at Konetik and now at Swytch.

Contact

Working on something I could help with? Send me an email.

[email protected]

A link or a few lines is enough. I reply within two working days.

Fixed-price engagements: audits, shipping, fractional CTO

On the bench

Paused

HowRisky.aiRetirement risk estimates using Monte Carlo simulation.
FutureGiftAn ETF position as a gift, held for a child until they turn 18.

Papers

INESC TEC

Benchmark of Encoders of Nominal Features for RegressionWorldCIST 2021 · peer-reviewed
Estimating the Likelihood of Financial Behaviours Using Nearest NeighborsComputational Economics 2023 · peer-reviewed
Hierarchical Qualitative ClusteringarXiv 2020 · preprint
A Review on Oracle Issues in Machine LearningarXiv 2021 · preprint

Work with me

From prototype to production.

I take products from an idea, or from a prototype someone else built, to software you can put in front of customers. Most projects start from one of three situations.

01Your Lovable or Replit app works in the demo, and nobody knows what happens when a hundred real people use it.
02There's a codebase nobody wants to touch, and a feature list that keeps getting longer.
03You need someone senior to make architecture and budget calls a few days a month, without a full-time CTO.

You keep building with AI. Keep asking Lovable, Claude Code, Codex or Cursor for changes, the way you do now. The difference is that every change goes through tests, review and a staging environment before it reaches the production app your users see.

Four ways to start

Production Readiness Audit

€800

One week

What will break before real customers find it: a prioritised risk list, a remediation plan and a recorded walkthrough.

One codebase. Diagnosis and plan, not the fixes.

Website Modernisation

From €1,800

Two to three weeks

Your site rebuilt around the enquiry you actually want, with analytics set up so you can see whether it worked.

Around five pages, lead capture, basic SEO, handover.

Ship It

€1,200 to €2,000

One week

CI, automated tests and a reliable deploy, with a way to roll back and a runbook the next engineer can follow.

One repository, one environment.

Fractional CTO

From €2,000 / mo

Ongoing, monthly

Architecture, budget and vendor decisions, and code review, with a weekly call. I write code myself when that's faster.

Build work beyond small fixes is scoped separately.

Every engagement includes a weekly call and a written update. You won't have to chase me to find out where things are.

How I work

I run AI coding agents in parallel on well-defined tasks. I make the architecture decisions, review and integrate everything, and I'm responsible for the result. Tests and CI come first, so that working fast doesn't mean things break the following week.

Previous work

KonetikBuilt the machine learning behind a product that told fleets which of their vehicles could go electric. Quartix PLC bought the company in 2023.
SwytchCo-founder and CTO. Charging schedules for commercial electric fleets: optimisation within the depot's power limit, live vehicle data, and the infrastructure underneath.
BJJ GraphAn interactive map of Brazilian Jiu-Jitsu positions. React, Cloudflare, Supabase, Playwright. Live, and the source code is public.

Tell me what you're working on.

A repo, a link, or a few lines about the problem. I reply within two working days, with a fixed-price scope if it's a fit, or a short note if it isn't.

[email protected]

Invoiced by a Portuguese company with an EU VAT number registered in VIES. Company details come with the quote. Prices exclude VAT. Clients in Portugal pay VAT at 23%. Businesses elsewhere in the EU are invoiced under the reverse charge, and clients outside the EU are invoiced without Portuguese VAT.

Replies within two working days

Send me a project