Services
Engineering for trading, brokerage and payment products.
I am Daniel Chen, a senior engineer who works on live broker, prop-trading and payment systems. I take on a small number of independent engagements for founders and trading businesses, remotely from Kuala Lumpur. Each page below separates what I have delivered in production from what I can design and build next.
Core services
Technical partner for fintech founders
A hands-on founding engineer or fractional CTO: discovery, architecture, backend, front end, infrastructure and delivery, working directly with you.
For founders with an idea, a prototype or a codebase that needs an owner.
Learn moreMT5 Manager API integration
Services on the MetaTrader 5 Manager API and Web API: accounts, positions, deals, balance operations and real-time risk monitoring, from an engineer who has run one in production.
For brokers, prop firms and platform teams whose product depends on MetaTrader 5 data.
Learn moreProp firm software development
Challenge rules, real-time breach monitoring, MT5 account operations, admin tools and attribution for prop-trading firms, from an engineer who built them on a live platform.
For prop-trading firms and founders launching one.
Learn moreTrading platform & brokerage engineering
Broker back offices, client portals, risk components and the integrations between them, designed for correctness first and for multi-brand operation later.
For brokers and founders building or extending their own trading infrastructure.
Learn morePayment infrastructure & integration
Card, wallet, bank and crypto payments built so money is never credited twice or lost: signed webhooks, idempotency, refunds and reconciliation.
For fintech products, brokers and platforms that take deposits or pay out.
Learn more
Also available
Backend & system development
APIs, integrations, data and cloud for systems that have to be right: event-driven services, background jobs and DevOps.
Websites & web apps
Fast Next.js websites, portals and dashboards that load quickly, are easy to find and work in more than one language.
Mobile apps for iOS & Android
Flutter apps for iPhone and Android from one codebase, with the backend, push notifications and store release handled.
Hiring for your team?
I am also open to senior backend and full-stack roles, full-time or contract.
How we can work together
Start small. Commit when it works.
Every engagement starts with a written scope. You know what you are getting, what it costs and what is left out before any work begins.
- 01Fixed fee · 1 to 3 weeks
Technical discovery sprint
I review your requirements, existing code and third-party access, then deliver a written architecture, a feasibility and risk report and a milestone plan. Yours to keep, whoever builds it.
- 02Paid by milestone
Fixed-scope MVP build
A defined first release, built in milestones on a staging environment you can use throughout. You pay for delivered milestones, not for hours.
- 03Monthly
Founding engineer contract
I join as your hands-on technical owner: architecture, backend, front end, infrastructure and releases, working directly with you.
- 04Part-time · monthly
Fractional technical lead
You already have a developer or a small team. I own the architecture and the risky parts, review the work and keep delivery honest.
I quote each engagement in USD after a first call. I work from Malaysia with no agency layer, so the budget goes into engineering, not account management. I price on scope and responsibility, and I am not the cheapest option.
- You work with the person doing the work
- Written scope and milestones
- Source code, access and documentation handed over
- NDA on request
How we would work
- 01
A short call
A no-obligation conversation about what you are building, what exists already and what success looks like.
- 02
A written scope
What I will build, what I will not, the risks and the price. Larger or unclear projects start with a short, paid discovery sprint.
- 03
Small, visible releases
You see working software early and often, on a staging environment you can click through.
- 04
Handover and support
Source code, access, documentation and runbooks, with ongoing support if you want it.
Questions
- Where are you based, and can you work with US, UK and European teams?
- I am based in Kuala Lumpur, Malaysia (GMT+8) and work remotely. European mornings overlap my afternoons, and US hours overlap my mornings and evenings, so we agree fixed overlap hours at the start. I have no office in the US or Europe and do not claim one.
- Are you an agency?
- No. You work with me directly. I am one senior engineer, and I say so when a project needs more people than that.
- How does pricing work?
- After a first call I send a written scope with a price in USD: a fixed fee for a discovery sprint, milestones for a defined build, or a monthly rate for ongoing work. You know the cost before anything starts.
- Who owns the code?
- You do. Source code, infrastructure access and documentation are handed over. If I bring pre-existing components of my own, I say so up front and license them to you.
- Do you handle licensing and regulation?
- No. Licences, legal structure, KYC and AML policy and payment-provider approvals belong to you and your advisers. I design systems so the controls they require can be met.
- Will you sign an NDA?
- Yes, happy to sign one before you share the details.
- Are you also open to a permanent role?
- Yes, for the right senior backend or full-stack role. There is a separate page for hiring teams.
Tell me what you are building.
A few lines are enough: what it is, where it stands today, and what you need from an engineer. The form is just below, or email me if you prefer. I reply within two working days.