Services
Web Services & API Development Poland
Robust backends, REST & GraphQL APIs, and high-performance web platforms that scale with your business.
The Challenge
Many web platforms are built fast and never revisited — until the day traffic triples, a critical integration goes down at 2am, or a new hire spends a week just figuring out how the codebase fits together. By then, the cost of fixing the foundation is far higher than building it right the first time.
APIs suffer a similar fate: undocumented endpoints, inconsistent error handling, and no versioning strategy turn every new client integration into a multi-week archaeology project instead of a quick read of the docs.
Our Approach
We design backends and APIs around clear service boundaries, typed contracts, and automated tests from the start — so scaling the team or the traffic doesn't mean rewriting the foundation. Every API ships with OpenAPI/GraphQL schema documentation that's generated from the code, not hand-written and immediately out of date.
For CRM and internal tooling, we favour boring, provable technology choices — PostgreSQL, well-understood queues, and observability baked in from day one — because reliability compounds over years, not sprints.
What's Included
REST & GraphQL APIs
Typed, versioned, documented APIs designed for both first-party apps and third-party integrations.
CRM & Internal Tools
Custom admin dashboards and CRM systems tailored to how your team actually works, not a generic template.
Database Architecture
Schema design and query optimisation that stays fast as your data grows from thousands to millions of rows.
Third-Party Integrations
Payments, email, CRM, and analytics platforms wired in with proper error handling and retry logic.
Technologies We Use
Node.jsTypeScriptPostgreSQLGraphQLRedisDockerNext.jsPrisma
Our Development Process
01
Requirements & Data Modelling
We map out the domain model and key workflows with you before writing any code, catching costly design mistakes early.
02
API & Schema Design
Endpoints or GraphQL schemas are designed and reviewed with you before implementation starts, so integrations never rework twice.
03
Sprint-Based Development
Two-week sprints with a working, deployed environment you can poke at throughout — not just a demo video at the end.
04
Load Testing & Hardening
We load-test critical endpoints and review error handling, rate limiting, and logging before go-live.
05
Launch & Monitoring
Structured logging and uptime monitoring ship with the platform, so issues are caught before your customers report them.
Related Projects
Our first collaboration with Sparkler Soft and Sergey on Azarium, a real estate investment app with crypto payments, was an excellent experience. The team successfully delivered the entire product from concept to launch, including two mobile applications, an admin panel, backend infrastructure, and AWS DevOps. Throughout the project, they demonstrated strong technical expertise, a highly professional approach, and consistent attention to quality. The execution was excellent, and the final outcome met our expectations in every respect. Communication was seamless, efficient, and maintained at the highest standard throughout the engagement. We highly value this cooperation and confidently recommend Sparkler Soft and Sergey as a reliable and capable technology partner.
Direct client feedback · June 2026
Frequently Asked Questions
Both — the right choice depends on your clients. GraphQL tends to fit apps with several different frontends fetching overlapping data; REST is often simpler for public, third-party-facing APIs. We'll recommend based on your actual use case.
Start Your Web Services & API Project
Tell us about your project and get a free estimate within 48 hours.