Developer for fintech and accounting softwareAvailable now
Fintech software where every number has to be right.
I spent six years on Dinero, one of Denmark's most popular accounting platforms, first as an employee and then brought back as a freelancer. I built the frontend for Storebuddy, which automates bookkeeping for webshops. I know what it means to ship features in a product where a rounding error ends up in someone's tax return.
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Is this a fit?
An honest fit check before we talk
I would rather tell you no on the first call than waste your budget. Here is what a good match looks like in this sector.
A good fit if
- You build accounting, bookkeeping, invoicing, payments or other financial software and need a senior developer who understands the stakes.
- Your product handles money or financial data and you want correctness, audit trails and tests treated as standard.
- You need integrations with banks, payment providers, accounting systems or e-commerce platforms.
- You want someone who has worked inside a mature fintech codebase and can join yours without a long ramp-up.
Probably not a fit if
- You need a licensed financial adviser or a compliance consultant. I build software, and I work with your compliance people.
- You need blockchain, trading algorithms or machine learning. Not my field.
- Your stack is far from TypeScript, React, Vue and Node.js.
What I do
What I typically build in this sector
- Financial product frontends
- Invoicing, bookkeeping, reporting and dashboard UIs with complex forms, tables and calculations that stay fast and correct. Built in React or Vue with TypeScript.
- Integrations
- Payment providers such as Stripe, bank and accounting APIs, e-commerce platforms and webhooks, built with idempotency, retries and logging so money never goes missing silently.
- Data correctness
- Typed domain models, decimal-safe calculations, validation on both sides, and tests around the rules that matter, like VAT, rounding and reconciliation.
- Senior capacity for fintech teams
- Join your existing team, ship features from the first week and review code with an eye for the edge cases that show up at quarter end.
Proof
Clients who kept me around
Six years in accounting software, a year in e-commerce bookkeeping, and three years in another regulated sector.
Visma Dinero
Frontend Developer · Full-time, then freelance
Frontend development on Dinero, one of Denmark's most popular accounting platforms for entrepreneurs and small businesses. First as an employee for four years, then they brought me back as a freelancer for two more.
Read the case studyStorebuddy
Frontend Developer · Freelance
Frontend for a platform that automates bookkeeping for webshop owners and flags imbalances on orders, turning messy e-commerce data into something an accountant can trust.
Read the case studyY-mAbs Therapeutics
Full-Stack Developer · Freelance
Full-stack development of web solutions for a commercial-stage biopharmaceutical company, a regulated environment where reliability, correctness and clear documentation are not optional.
Read the case study
Process
How we'll work together
The same four steps for a two-day fix and a two-year engagement.
Intro call
A free 30-minute call where you tell me about your project, goals and constraints. I ask a lot of questions and tell you honestly whether I'm the right fit.
Proposal & estimate
You get a short written proposal: scope, approach, timeline and price. Fixed price for well-defined projects, hourly or retainer for ongoing work.
Build in the open
Short iterations, working software early, and a weekly update you can actually read. You see progress and can change course before it gets expensive.
Launch & support
I handle deployment, hand over clean documentation, and stick around for support and further development if you want me to.
FAQ
Questions I get asked
- What fintech work have you actually done?
- Six years of frontend development on Dinero, an accounting platform used by a large share of Danish small businesses, covering invoicing, bookkeeping and reporting features. A year building the frontend for Storebuddy, which pulls orders from webshops, automates the bookkeeping and flags imbalances. Plus payments in my own booking product, Tiltiden.
- How do you handle code quality in a regulated environment?
- Typed code, tests around the logic that matters, code review on every change, and written documentation of decisions. Pull requests, CI and a deployment history you can audit. I have worked this way inside a pharma company and an accounting platform, where a wrong number is not a cosmetic bug.
- Do you have experience with PSD2, open banking or specific payment providers?
- I have integrated payment providers and accounting APIs and built on top of bank data in a product context. I will not claim certifications I do not hold. On the intro call I can go through your specific providers and tell you honestly what I have done before.
- Will you sign an NDA?
- Yes. Most of my clients are under NDA and I only mention the ones I have permission to name. Your code, data and roadmap stay yours.
- How do you price work?
- Fixed price for well-defined projects, hourly or a monthly retainer for ongoing work. My preferred engagement is 20-40 hours a week for six months or more. Rates are in the proposal, not on the site.
- How quickly can you start?
- Current availability is on the homepage. If it says available, usually within one to two weeks after a free 30-minute intro call and a short written proposal.
Contact
Tell me what you are building
What it is, roughly when it needs to exist, and what a great result looks like. I usually reply within a day, and the first 30-minute call is free.
hello@perhp.com