If you’re reading this with a project tracker open in one tab and a budget spreadsheet turning red in another, you’re not alone. We’ve sat across the table from enough BFSI and fintech leaders to know that “we’re over budget” is rarely a one-time surprise. It’s usually the result of five or six small decisions made in the first two weeks of the project — decisions nobody flagged as risky at the time.
At Speqto Technologies, we’ve rescued (and occasionally rebuilt) enough custom platforms — loan origination systems, UPI-based wallets, AML monitoring tools — to know the pattern by heart. Let’s break down why it happens, and more importantly, what to actually do about it.
1. The requirements were “mostly” clear, not fully clear
This is the single biggest budget killer we see. A product owner at an NBFC once told us, “We know what the loan workflow should look like, let’s start building and refine as we go.” Six months later, the team had built three different versions of the underwriting screen because “refine as we go” quietly became “redesign every sprint.”
Vague requirements don’t just cause rework — they cause estimation errors that compound. If the dev team doesn’t know whether your KYC flow needs to support both Aadhaar-based e-KYC and manual document upload on day one, they’ll estimate for one and build for both later, at a premium.
2. Compliance gets bolted on instead of designed in
We worked with a payments startup that had a slick MVP ready for demo — until their legal team flagged that transaction logs needed to be immutable and audit-ready for RBI inspection. That single requirement, raised in month four, meant redesigning the database layer and adding a whole audit module. Had it been part of the original BRD, it would’ve cost a fraction of the retrofit.
In BFSI/fintech, compliance isn’t a feature you add later — it’s an architectural decision. PCI-DSS, RBI data localization, AA (Account Aggregator) framework rules — these shape your database design, your hosting, your encryption strategy from day one.
3. Fixed-bid contracts for projects that aren’t actually fixed-scope
Fixed-bid feels safe on paper. But if your product is evolving — which most fintech products are, given regulatory changes and market feedback — a fixed-bid contract just means every change becomes a painful negotiation, or worse, gets crammed in without proper estimation, creating technical debt that costs you later.
4. Integration complexity is almost always underestimated
Connecting to a core banking system, a credit bureau API, or a payment gateway sounds like “just an API call” until you’re three weeks into dealing with undocumented error codes, rate limits, and a sandbox environment that behaves nothing like production. We had a client integrating with a credit bureau whose sandbox literally didn’t support the score format used in production — that mismatch alone added two weeks and a fair bit of rework.
5. No formal change control, so scope creep hides in plain sight
“Can we also add a dashboard for the ops team?” “Can the admin panel export to Excel too?” Individually, these feel like five-minute asks. Collectively, over a six-month project, they can add 20-30% to your timeline — and nobody notices until the invoice arrives.
How to actually fix this
- Write a real BRD, not a wishlist. Before a single line of code is written, document user flows, data fields, roles, and edge cases. Get sign-off from both business and compliance stakeholders — not just product.
- Front-load compliance conversations. If you’re BFSI/fintech, bring your legal/compliance team into the first two sprints, not the UAT phase. Ask: what needs to be audit-logged, encrypted, or localized?
- Use milestone-based, not pure fixed-bid, contracts. Break the project into 2-4 week milestones with clear deliverables and payment tied to acceptance. This keeps both sides honest and makes scope changes visible immediately, not retroactively.
- Do an integration audit before estimation. Get sandbox access to every third-party system (payment gateway, KYC provider, credit bureau) before your dev team quotes timelines. We insist on this at Speqto — it’s saved clients weeks of rework.
- Set up a lightweight change request process. Every new ask gets logged, estimated, and approved before it enters the sprint. This isn’t bureaucracy — it’s what lets you say “yes, and here’s what it’ll cost” instead of discovering the cost three months later.
- Pick a partner who’s actually built in your domain. A team that’s shipped lending or payments products before will ask the uncomfortable questions in week one — about NPA classification rules, settlement cycles, reconciliation logic — that a generalist team won’t think to ask until it’s expensive to fix.
Budget overruns in custom software aren’t bad luck — they’re usually the predictable result of skipping one of the steps above. The good news: every one of these is fixable before you write a single requirement document. If you’re planning a build in the lending, payments, or insurance space and want a second pair of eyes on your scope before you commit budget, that’s a conversation we have often at Speqto — and it’s usually the cheapest hour you’ll spend on the whole project.
