FastAPI Development Services for Singapore SaaS, AI, and Data Teams
FastAPI development is the building of high-performance, async Python APIs and microservices with the FastAPI framework, the service layer modern SaaS, data, and AI products run on. MicroPyramid has 12+ years of Python and API work and ships these for Singapore startups, SMBs, and enterprises: async APIs, microservices, and ML/LLM serving layers built for real concurrency.
Why Singapore Teams Choose Us for FastAPI
Three reasons Singapore founders and product teams pick MicroPyramid over a local agency or a generic offshore team
Privacy-Aware APIs
API surface, logging, data retention, and third-party calls are designed with privacy and compliance in mind, with the access controls and audit trail enterprise and public-sector clients expect. AWS ap-southeast-1 (Singapore) available for data residency.
SGD Billing via Stripe
Invoices in SGD, collected via Stripe. No currency conversion headaches and no wire-transfer friction, billing that fits how Singapore businesses actually operate.
Clear Ownership, Not a Ticket Mill
Our engineers directly own every engagement. You will not be passed to a delivery layer of junior developers. The engineer who scopes your API in discovery is the one who builds it.
Singapore APIs and Integrations We Build With FastAPI
Singapore products can lean on national digital infrastructure (Singpass and Myinfo for identity, InvoiceNow for e-invoicing) and then add the layers most modern APIs need: payment-provider webhooks, semantic search, and LLM providers. These are the integrations we build most often, and what doing them properly involves.
Singpass, Myinfo, and Corppass
National digital identity and consented person and business data
Singpass login and Myinfo let users sign in and share government-verified data, such as name, address, and contact details, with explicit consent, which removes most manual form-filling at sign-up. Myinfo business and Corppass do the same for companies. Access goes through Singpass onboarding, which reviews your use case and the data items you request. We build the OpenID Connect flow and store only the items you justified.
- Singpass OpenID Connect login with secure key handling
- Myinfo person and business data retrieval with consent
- Data-item minimisation matched to your approved scope
- NRIC minimisation, never used as an identifier
Stripe and Payment Webhooks
Subscriptions and one-off charges in SGD through Stripe or a similar provider
Most Singapore SaaS products take card and wallet payments through Stripe or a comparable provider. The checkout page is the easy part; the work is keeping your own records in step with what the provider reports. We build FastAPI webhook handlers that verify every event, process it once even when the provider retries, and keep subscription and refund state accurate in SGD and any other currency you sell in.
- Signature-verified webhook endpoints
- Idempotency keys on every charge and refund call
- Subscription state driven by provider events
- Scheduled reconciliation against provider payouts
Search and Vector Databases
Semantic search and RAG retrieval over your own content
An AI assistant is only as good as the passages it retrieves, so search is often where a Singapore product’s AI features succeed or fail. We build FastAPI ingestion and query services on PostgreSQL with pgvector, OpenSearch, or a managed vector database, combining keyword and semantic ranking and keeping each customer’s documents partitioned so one tenant never sees another’s results.
- Async ingestion with chunking and embedding pipelines
- Hybrid keyword and vector search
- Per-tenant isolation of indexes and results
- Re-indexing when content or embedding models change
InvoiceNow (Peppol) e-Invoicing
Singapore’s national e-invoicing network
InvoiceNow is Singapore’s Peppol-based e-invoicing network, used by businesses and government agencies to exchange invoices directly between systems. We build FastAPI services that generate and validate Peppol invoices, connect to your access point provider, and keep invoice data consistent.
- Peppol invoice generation and validation
- Access point provider integration
- Invoice data checks before submission
- Delivery and status tracking
LLM and AI Provider APIs
OpenAI, Anthropic, AWS Bedrock, or self-hosted models behind one service
Calling a model provider straight from every feature leaves keys scattered, spend invisible, and no fallback when a provider slows down. We put one FastAPI layer in front of OpenAI, Anthropic, AWS Bedrock, or models you host in Singapore, streaming responses to the client and failing over between providers. Redacted prompt logs also give you a record of which overseas providers receive what data.
- Streaming responses over server-sent events
- Retries and fallback across providers
- Token budgets and cost logging per tenant
- Prompt and response logs with personal data redacted
Our FastAPI Development Services
Six services covering the full lifecycle of high-performance Python APIs, from async builds and microservices to ML serving and migration
High-Performance Async APIs
Async FastAPI services for Singapore SaaS, data, and AI products that call identity, LLM, and third-party providers in parallel. Async I/O keeps a slow upstream from stalling sign-up or checkout.
- Async/await concurrency
- Pydantic v2 validation
- Automatic OpenAPI docs
Microservices Architecture
Split a Singapore platform into services with clear boundaries: identity and onboarding, billing, AI and search, and reporting. Isolating sensitive functions makes vendor security reviews and audit evidence far easier to produce.
- Sensitive-function isolation
- Docker and Kubernetes
- REST plus event queues
AI & ML / LLM Serving APIs
Streaming LLM endpoints, RAG services, and model-serving APIs with the records Singapore buyers ask for: which overseas providers receive personal data, and logged inputs for AI recommendations and decisions.
- Model and LLM serving
- Server-sent event streaming
- Transfer and decision logging
Migration to FastAPI
Move legacy Flask, Django REST, or synchronous APIs onto async FastAPI endpoint by endpoint, behind the same URLs your Singapore and regional partners already call. Contract tests prove each cut-over before traffic moves.
- Phased, low-downtime migration
- Contract tests against the old API
- Performance audit first
Maintenance & Support Retainers
Security patching, dependency upgrades, Singpass and third-party API changes, and feature work for FastAPI services in production, with patching cadences that fit enterprise security reviews.
- Security and dependency updates
- Provider version upgrades
- Feature work alongside your team
Cloud Deployment & DevOps
Deploy FastAPI to AWS ap-southeast-1 (Singapore), multi-AZ, when data residency matters to your customers or risk team. CI/CD, structured logs, tracing, and infrastructure as code your auditors and enterprise clients can review.
- AWS ap-southeast-1 (Singapore) deployment
- CI/CD with GitHub Actions
- Infrastructure as code
FastAPI, Django REST, or Flask? How to Choose
The three frameworks solve different problems, and real Singapore products often mix them. Here's the honest version, so you pick the right tool instead of the trendy one. We help you make the call in discovery, before any budget is committed.
Choose FastAPI when…
- You need a high-performance, type-safe API or microservice
- You're serving AI/LLM features, RAG endpoints, or heavy async I/O
- OpenAPI-first contracts and Pydantic validation are priorities
- You want a lightweight service, not a full web framework
Choose Django REST when…
- You want a full web app (admin, auth, and ORM) plus its API
- You're building a SaaS, portal, or content-driven product
- Convention-over-configuration and a large ecosystem matter most
- Raw async throughput is not the dominant constraint
Choose Flask when…
- You have a small, simple service with minimal dependencies
- You want maximum freedom over structure and libraries
- Async and built-in validation are not requirements
- You are maintaining an existing Flask codebase, not starting fresh
Need a full Django web app rather than a standalone API? See Django Development for Singapore Teams, or broader Python work, Python Development Services.
Best Fit For
- Singapore SaaS, AI, and data teams that need high-throughput, auditable Python APIs
- products integrating Singpass, Myinfo, Corppass, or InvoiceNow alongside LLM and search services
- vendors selling into enterprises, healthcare groups, and public agencies that need audit-ready engineering
- migrations from slow Flask or Django REST APIs to modern async FastAPI
Not the Right Fit When
- simple CRUD admin tools where a full async API offers no real benefit
- engagements looking only for staff augmentation without delivery ownership
- pure frontend or marketing-site work with no API or backend complexity
- teams wanting an API rewrite with no measurable performance or scaling problem to solve
Need broader Python work beyond APIs? See Python Development Services, or serving AI features inside your product, see AI Feature Development.
Our FastAPI & Python Stack
Modern async technologies and proven patterns, deployed to AWS ap-southeast-1 (Singapore) for data residency
Core Framework
Data & Storage
DevOps & Cloud
How to Get Started as a Singapore Team
We recommend starting with an API Discovery Sprint: clarify the workload and architecture before committing to a full build. All engagements billed in SGD via Stripe.
API Discovery Sprint
Recommended start
Clarify the workload, data contracts, throughput targets, and architecture before committing to a full build. Billed in SGD via Stripe, delivered with daily async updates and a fixed estimate at the end.
- Workload and throughput analysis
- API and schema design
- Architecture and scaling plan
- Migration assessment if relevant
API Build Sprint
Ship a production-ready FastAPI service or set of microservices with async foundations that are genuinely ready to scale, not a throwaway prototype.
- Production-ready async API
- Pydantic models and OpenAPI docs
- Clear deliverables and timeline
Maintenance & Retainer
Ongoing FastAPI maintenance, performance tuning, and feature work end-to-end.
- Security and dependency upkeep
- Performance and scaling work
- Retainer or time-and-material
Selected Work
FastAPI services and API products we have built and shipped, each linked to its case study.
DiscoveredBy
AI search visibility platform that tracks how brands appear in ChatGPT, Gemini, Perplexity, Claude, and Grok, built with FastAPI, SvelteKit, and AI agents.
Read case studyOnlineCompiler.io
Sandboxed code execution platform for 12 languages with a REST API, WebSocket support, an embeddable widget, and MCP support for AI agents.
Read case studyIntentport
Our voice and text AI agent for websites: answers from live business data, books appointments, and sends qualified leads to the CRM in five languages.
Read case study
CREDITABLE
Employee financial wellness platform covering savings, workplace loans, and repayment workflows, built on Django and FastAPI.
Read case studyFastAPI Development FAQs for Singapore Teams
Straight answers to what Singapore founders and CTOs ask us before starting a FastAPI project.
What drives the cost of a FastAPI project?
The main drivers are scope and endpoint count, the complexity of your data model, how many integrations are involved (Singpass, Myinfo, InvoiceNow, Stripe, LLM providers, search), whether you need real-time or streaming features, and the security and audit evidence your buyers expect. We give a fixed estimate in SGD after a short discovery sprint rather than running an open-ended hourly meter.
Can you integrate Singpass and Myinfo into our onboarding?
Yes. We build Singpass login and Myinfo retrieval as an OpenID Connect flow in FastAPI, and Myinfo business with Corppass for company onboarding. Access is granted through Singpass onboarding, which reviews your use case and the specific data items you request, so we help you justify a minimal set. We store only those items, and do not collect or use NRIC numbers as identifiers unless there is a genuine need for high-assurance identity verification.
Can you build InvoiceNow e-invoicing into our software?
Yes. InvoiceNow is Singapore’s Peppol-based e-invoicing network. If you build invoicing, ERP, or accounting software for Singapore, your product needs to produce valid Peppol invoices through an access point. We build that integration and the invoice data checks in FastAPI.
Is FastAPI fast enough compared to Node.js or Go?
For most API workloads, yes. FastAPI runs on async Starlette and Uvicorn and delivers throughput in the same class as Node.js and close to Go for typical I/O-bound APIs, while keeping Python’s ecosystem for data and AI. Go still wins for extreme CPU-bound or ultra-low-latency cases, but for AI service layers, data-heavy APIs, and most SaaS and data backends, FastAPI is fast enough and far quicker to build.
Why is FastAPI the standard for AI and LLM backends?
FastAPI is async by design, so it handles the long-lived, concurrent connections that LLM calls and streaming responses require, and it sits in Python, the native language of AI tooling like LangChain, vector databases, and model SDKs. That makes it the natural place to build RAG endpoints, model-serving APIs, streaming chat, and agent backends without a separate stack.
Can you migrate our Flask or Django REST API to FastAPI?
Yes. We audit the existing API, identify async and performance bottlenecks, and migrate to FastAPI incrementally, running services side by side and cutting over endpoints without downtime, rather than risking a big-bang rewrite that destabilises the product your Singapore customers rely on. Many engagements start as a migration and performance audit sprint.
Where will our API and data be hosted?
For Singapore products we usually deploy to AWS ap-southeast-1 (Singapore), multi-AZ in-region, so personal data, backups, and logs stay in Singapore. We record every overseas service an endpoint calls, including LLM providers, so you have a documented record of where personal data goes. For enterprise and public-sector clients we design access control, logging, and patching for audit from the first architecture session.
How does billing work for Singapore teams?
We invoice in SGD and collect via Stripe, structured around fixed-scope sprints or a monthly retainer.
Do we own the source code and IP?
Yes. You own all source code and intellectual property we produce for you. Everything is committed to your repositories as we build, so there is no lock-in and no handover risk if you later bring the work in-house or move to another team.
Ready to Build a Fast, Reliable API?
If you need a team to build or scale FastAPI services, with SGD billing and AWS ap-southeast-1 (Singapore) data residency, we are ready to talk. No junior handoffs, no ticket mills. Just high-performance API engineering for Singapore teams.