OPTIMIZED, PERFORMANCE & COMPLIANCE

Android Development Services

We provide full-cycle Android development services optimized for payments, POS terminals, and custom devices.

• EMV-compliant Android POS applications (C2, C3, C4, C8 kernel support)
• Custom SDK development for OEMs and payment vendors
• Android L2 Kernel app development and HAL integration
• Secure mobile apps for consumer and enterprise use
• Technical consulting, audits, and code reviews

iOS Development Services

Our iOS solutions focus on secure SDKs, contactless payments, and NFC integrations, tailored for financial and enterprise ecosystems.

• HCE SDKs for iOS with tap-to-pay features
• C4 and C8 EMV kernel SDKs for contactless payments
• Native iOS apps with advanced NFC & secure element integrations
• iOS SDK consulting and architecture design

JavaCard & eSIM Services

We specialize in secure element software for JavaCard, SIM Toolkit, and eSIM provisioning.

• Custom JavaCard applets for contact & contactless payments (EMV-compliant)
• SIM Toolkit applications for telecom operators
• eSIM applets aligned with GSMA standards
• Cryptographic logic integration: AES, RSA, HMAC
• GP-compliant personalization and OTA support

REST API Development & Cryptography

We build secure and scalable backends, especially for fintech platforms and identity systems, with deep expertise in API and cryptographic standards.

• RESTful API development using Spring Boot (Java/Kotlin)
• Swagger/OpenAPI documentation for developer-friendly integration
• PKCS #11/#12 certificate management and cryptographic operations
• Encrypted communication, tokenization, and JWT integration

Java Application Development

Custom Java software solutions for enterprise automation, secure processing, and scalable backends.

• Java-based command-line tools and automation scripts
• Backend services for authentication, transaction processing, and more
• Modular microservices or monolithic Spring Boot applications
• Legacy system enhancements and code modernization

NEXO NIS 4.0 and 5.0 Fast Applications (Android)

Developed Android NEXO FAST applications compliant with NEXO NIS 4.0 and 5.0, successfully completed certification processes for client deployments.

JavaCard ecdhApplet

Secure JavaCard applet implementing ECDH cryptographic operations, optimized for mobile and embedded platforms.

Android NFC APDU Application

Developed an Android NFC-based APDU command/response application supporting ISO7816 protocol communications for secure data exchange.

JavaCard OpenPGP Applet

Created an OpenPGP JavaCard applet enabling secure key management, encryption, and digital signature operations on constrained devices.

iOS Contactless SDK for Card Data Activation

Designed an iOS SDK to securely collect and process non-personal card data over NFC for mobile-based activation workflows.

JavaCard AEIPS and Expresspay Applet (C4/C8 Kernel)

Developed JavaCard applets based on AEIPS and Expresspay specifications for C4 and C8 kernels, tailored for Amex and EMV compliance.

Java MQTT Client Application

Built a lightweight Java application capable of connecting to MQTT brokers for real-time messaging and IoT communication use-cases.

Java mTLS Processing Application

Developed a Java mTLS client to establish PKCS-based mutual TLS connections between Android apps and secured backend servers.

JavaCard IOCL Fleet Card Applet

Engineered a JavaCard applet specifically for fleet card management applications aligned with IOCL and payment network specifications.

At Sarvasoft, we solve the complex challenges of secure, scalable, and compliant payment system development. Our team brings deep, hands-on expertise in EMV technologies, fintech backends, Android POS, and cryptographic security—areas where most providers fall short or rely on third parties.

We’re not generalists—we're specialists. From custom EMV implementations to compliance-ready SDKs and secure APIs, we deliver robust solutions tailored for payment providers, banks, and fintech innovators.

What sets us apart is our speed, precision, and domain expertise. As a lean, focused OPC, we move faster than traditional firms while maintaining enterprise-grade reliability. Our proven track record includes building certified solutions for mission-critical payment environments under strict compliance.

Whether you're launching a new product, upgrading infrastructure, or navigating complex certification paths—Sarvasoft is your strategic technology partner.

At SARVASOFT, we prioritize innovation by leveraging cutting-edge technologies to enhance user experience. Our solutions are designed for scalability, ensuring they adapt to growing demands. Continuous improvement is embedded in our processes, allowing for agile responses to market changes. This approach fosters long-term partnerships and drives sustainable growth for our clients.

We believe in solving the right problems with the right tools—no buzzwords, just results.