New product development
Take a validated product from technical discovery to production, with an architecture designed to support what comes after launch.
Product scopingSaaS applicationsProduction launch
Need a software team? We'll build the product.
Leadsoft assembles and leads experienced engineers to design, build and launch SaaS products, backend systems and integrations - without you having to recruit and manage an in-house team.
WebReact · Next.js
Java APISpring Boot
DataPostgreSQL
CloudDocker · K8s
Your productProduction ready
Senior engineers only. Direct communication. Flexible contracts.
Based in Warsaw · Working internationally
Built for products that need to work in the real world.
Clear milestonesProduction ownershipPragmatic engineering
01 What we do
You bring the product knowledge.
We make it real.
Hiring a full internal team takes months. Coordinating several freelancers creates more work for you. Leadsoft gives you one accountable engineering partner from technical planning through production release.
02 Capabilities
Focused services for companies building software as a core part of their business.
Software teams for hire
Bring in an experienced project team to deliver important features, accelerate your roadmap or extend your existing engineering capacity.
Project teamsFeature deliveryTeam extension
Java backend engineering
Build reliable Java and Spring Boot services, APIs, integrations and data workflows for backend-heavy software products.
Java & Spring BootAPIs & integrationsData systems
03 Selected work
Experience across products
with real operational depth.
01
AI Infrastructure · Distributed Systems
UK AI Consultancy
Backend infrastructure for running long-lived AI agents and human-in-the-loop workflows. The system coordinated asynchronous tasks, message queues, state management and user input across a production environment.
02↗
Real Estate · Data Infrastructure
AREAwww.areaagency.pl/en/offers
An end-to-end property platform for a Warsaw real-estate agency, combining automated listing synchronization, advanced search, property valuation and lead-generation workflows. Delivered across data ingestion, backend APIs, customer-facing frontend and cloud deployment.
Selected experience behind Leadsoft. Client names and project details are shown only where permitted.
04 Core expertise
Java systems built for production.
Leadsoft specialises in backend-heavy software built with Java and Spring Boot. We design reliable APIs, integrations, data pipelines and asynchronous workflows, then assemble the additional engineering needed to deliver the complete product.
Java & Spring Boot
Backend services designed for clear ownership, maintainability and continued product development.
APIs & Integrations
Payment providers, external platforms, internal services and complex data exchange.
Data & Messaging
PostgreSQL, event-driven workflows, queues, background processing and data pipelines.
Cloud & Reliability
Containerised deployments, automated delivery, observability and production support.
JavaSpring BootPostgreSQLRabbitMQPub/SubDockerKubernetesGCP
05 Who you work with
Senior-led. Built around your project.
Every engagement is led directly by Leadsoft's founder, Aleksander Szczepaniak, a backend engineer with experience delivering production systems for international companies and funded software products.
When a project requires additional capacity, we bring in trusted backend, frontend, infrastructure and design specialists. You get the capabilities of a complete project team with one accountable technical lead.
Specialization
Java & Spring Boot backend engineering, APIs, integrations and production data systems.
Selected experience
Production backend systems for a UK AI consultancy and a Warsaw real-estate platform, among other international engagements.
Team composition is assembled per project: you always deal directly with the engineer accountable for delivery, not an account manager.
06 How we work
A straightforward route
from conversation to launch.
Discovery
We clarify the business goal, product requirements, technical constraints and success criteria.
Team & plan
We define the architecture, scope and milestones, then assemble the specialists required for delivery.
Build
We deliver in visible iterations with regular demonstrations, code review and automated testing.
Launch & support
We deploy, document and monitor the system, then provide continued development and production support.
Your next release
Have a product that
needs to move?
Tell us what you are building, where it is blocked and what a successful release looks like.
kontakt@leadsoft.pl