A common question from Singapore manufacturers evaluating ERP options: "Should we just hire a developer instead?"
It is a reasonable question. A developer salary looks comparable to a custom ERP build cost. The thinking goes: hire someone, have them build the system, and we own it forever.
The maths is more complicated than the surface comparison suggests. This article works through the real cost, the hidden risks, and when the in-house approach actually fits.
The Real Cost of an Internal Developer
A mid-level full-stack developer in Singapore costs significantly more than the salary alone:
- Salary: S$70,000-S$120,000 per year for a 3-7 year experienced developer who can build a custom manufacturing system competently.
- CPF + benefits: Add ~17% employer contribution + benefits (medical, leave). Loaded cost rises to S$85,000-S$145,000.
- Equipment + software: S$3,000-S$5,000 in laptop, monitors, software subscriptions, cloud accounts.
- Recruiting: Either internal HR time or external recruiter fee (15-25% of first-year salary). For a S$100k role, the recruiting cost is S$15,000-S$25,000.
- Onboarding ramp: The first 2-3 months are typically below 50% productivity as the developer learns the business, the operations, and the priorities.
Fully loaded year-one cost: approximately S$110,000-S$180,000 for one developer.
For context, this is 4-18x the cost of a typical custom ERP build (S$10,000-S$30,000) from an external vendor like Start Canyon.
The "But We Own It Forever" Argument
The counterargument: after the build, the developer can maintain and extend the system. The S$110k annual cost is for ongoing development, not just the one-time build.
This is true — but it assumes the manufacturer has enough ongoing development work to justify a full-time role. For most SG SMB manufacturers, this assumption is wrong. After the initial build, the system's evolution rate is typically:
- First 6 months: Hyper-care fixes and small adjustments. Maybe 20-30% of a developer's time.
- Months 6-18: New module requests, integration additions, reporting expansions. Maybe 40-60% of a developer's time.
- 18+ months: Mature system, minor extensions, occasional integration work. Maybe 15-25% of a developer's time.
Unless the manufacturer also builds adjacent systems (customer apps, dealer portals, data products), the developer becomes underutilised after the first year. The cost stays high; the value declines.
The alternative — paying an external vendor S$5,000-S$15,000 per year for scope-based extensions — is significantly cheaper for the equivalent extension volume.
The Single-Person Risk
The most significant risk of the in-house approach is single-person dependency. The developer who built the system understands every design decision, every workaround, every undocumented behaviour.
When that developer leaves — and most developers leave within 2-4 years — the manufacturer faces a difficult transition:
- Hiring a replacement who can take over a custom codebase they did not build. This requires a senior developer who can read unfamiliar code; senior developers cost S$120,000-S$160,000.
- The handover gap. Even with a good replacement, the first 3-6 months are spent understanding the existing system. Bug fixes slow down. Feature requests pause.
- The documentation problem. Most internal developers do not maintain documentation as thoroughly as a vendor would for handover. The new developer is reverse-engineering as much as building.
An external vendor that ships to a private Git repo and writes structured documentation produces a system that any senior developer in Singapore can extend. The transition risk is much lower.
The Cross-Domain Experience Gap
A generalist developer hired into a manufacturing context may have never built:
- A B2B pricing engine with per-customer rates
- A supplier coordination portal with PO acknowledgement workflow
- A production scheduler with capacity constraints
- A quality module that handles customer-specific inspection profiles
- An InvoiceNow/PEPPOL e-invoicing integration
- A multi-currency cross-border transaction model (for SG + JB / Batam)
Each of these is a specific pattern with known pitfalls. A vendor who has built 20+ manufacturing systems brings the patterns. A first-time generalist will rediscover the pitfalls — which is education for the developer and cost for the business.
This is not a knock on the developer. It is the value of pattern-matching across many similar projects.
The Project Management Burden
When you hire a developer, you also become the engineering manager. Someone in the business has to:
- Define requirements clearly enough that the developer can build to them.
- Prioritise feature requests against limited capacity.
- Run quality checks on what the developer ships.
- Manage the deployment, hosting, and backup workflow.
- Handle the security, compliance, and audit requirements.
For most SG SMB manufacturer owners, this is a role they did not plan to take on. The ERP build becomes a second full-time job for the owner — and the actual business runs with less attention.
An external vendor brings the project management as part of the engagement. The manufacturer reviews weekly demos, approves scope decisions, and signs off on milestones. The total time commitment is hours per week, not days.
When the In-House Approach Fits
Hiring an internal developer is the right answer when:
- You have ongoing technology product needs beyond ERP. A customer-facing SaaS product, a complex data product, or multiple internal systems that need continuous development.
- Technology is competitive advantage. Manufacturers selling on technology differentiation (e.g., a sensor-equipped product with a software service layer) need in-house capability.
- You operate at scale that justifies the role. Generally 200+ staff with revenue above S$10M, with operational complexity that produces a steady stream of system requests.
- You can pair the developer with experienced leadership. A first-hire developer without an engineering manager (CTO, technical co-founder, or product lead) is at high risk of building the wrong thing.
For a 30-150 staff Singapore manufacturer with a one-time ERP need and a few extensions per year, the external vendor approach is faster, lower-risk, and cheaper over a 5-year horizon.
The Hybrid Pattern
A pattern that works for some Singapore manufacturers in the gap: hire an external vendor for the initial build (S$10,000-S$30,000), then bring in a part-time internal developer (S$3,000-S$5,000/month on contract) for ongoing extensions after the system stabilises.
This combines:
- The vendor's pattern experience for the initial build
- The vendor's code ownership transfer (you own the repo)
- A lower-cost ongoing capability for the post-launch evolution
- The flexibility to scale up or down based on actual workload
Start Canyon supports the hybrid pattern — we hand off the codebase with documentation, and any senior TanStack / React developer in Singapore can extend it. The free diagnostic at startcanyon.com/diagnostic helps assess whether in-house, external, or hybrid is the right approach for your specific operation.