Senior Mobile Engineer

Moniepoint

Who we are Moniepoint is an all-in-one financial services platform for emerging markets and the second-fastest growing company in Africa. Since 2019, Moniepoint’s technology has powered over 3 million people, offering personal and business banking, payment, credit and business management tools to help them succeed. Moniepoint processed $182 billion in 2023 and currently processes the majority of the POS transactions in Nigeria. About the role Location: Remote (Full time) What you’ll get to do * Design and Build sophisticated and highly scalable apps using Flutter. * Build custom packages in Flutter using the functionalities and APIs already available in native Android and IOS. * Translate and Build the designs and Wireframes into hight quality responsive UI code. * Write efficient queries for core Data. * Use of Model-View-Controller ( MVC) and Model-View-ViewModel-Controller (MVVM) as it relates to designing, developing architecture and developing maintainable, testable and functional software that meets product requirements. * Explore feasible architectures for implementing new features. * Resolve any problems existing in the system and suggest and add new features in the complete system. * Suggest space and time efficient Data Structures. * Follow the best practices while developing the app and also keeping everything structured and well documented. * Use CI/CD for smooth deployment. * Document the project and code efficiently. * Manage the code and project on Git in order to keep in sync with other team members and managers. * Communicate with the Project Manager regarding status of projects and suggest appropriate deadlines for new functionalities. * Ensure security guidelines are always followed while developing the app. * Validate the cloud system to ensure any new changes do not compromise security of the backend server. * Suggest new features and/or enhancements. * Maintaining software through product lifecycle including design, development, verification and bug fixes. * Connect regularly with the Quality Assurance Specialist to deliver stable app. * Resolve all the bugs reported by the Quality Assurance Specialist in a timely manner. * Perform time profiling and memory leaks assessment. * Execute app verification protocol. * Write tests for the App. * Following company policies and quality procedures to ensure quality product deliverables. TO SUCCEED IN THIS ROLE, YOU SHOULD HAVE * 5 years plus combined Mobile Development Experience * Flutter: To build cross platform mobile apps for Android, IOS and Web. This should include from making responsive UIs to efficiently query data and also manage states in an optimized manner. * Native Android (Kotlin preferably) and IOS: To build custom Flutter Packages. * Firebase: Should have experience with Cloud Firestore, Push Notifications, Cloud Functions and Analytics. * Figma: Should know how to use Figma to analyse and view the designs to build the app * Git: To manage and collaborate in different projects with the rest of the team. * Ability to provide a portfolio showing projects solely worked on upon request * Bachelors Degree in a related field Nice to have some of the technologies * Angular * Bootstrap * JavaScript * Native Android (Kotlin preferably) * Dart What we can offer you * Culture -We put our people first and prioritize the well-being of every team member. We’ve built a company where all opinions carry weight and where all voices are heard. We value and respect each other and always look out for one another. Above all, we are human. * Learning - We have a learning and development-focused environment with an emphasis on knowledge sharing, training, and regular internal technical talks. * Compensation - You’ll receive an attractive salary, pension, health insurance, annual bonus, plus other benefits. What to expect in the hiring process * A preliminary phone call with the recruiter * A hackerrank test  * A technical interview with a Lead in our Engineering Team * A behavioural and technical interview with a member of the Executive team.  Moniepoint is an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees and candidates. #LI-Remote

SaltRock

DAS ERWARTET DICH: Über SecureID SecureID ist eine mobile digitale Identitäts-Wallet für Hochsicherheitsumgebungen (u. a. Behörden und Unternehmenssicherheit). Hardwaregebundene PKI-Credentials (X.509, ECDSA P-256) liegen im Secure Element bzw. in Secure Enclave, Android Keystore oder StrongBox – das private Schlüsselmaterial verlässt die Hardware nie. Darauf aufbauend liefert SecureID eine breite Feature-Palette: physischen Türzugang per NFC/BLE, S/MIME-E-Mail-Signatur und -Verschlüsselung, Dokumentensignatur, Push-2FA, TOTP und passwortloses Windows-Logon – alles aus einer App. Das System ist produktiv in der Pilotphase. Du übernimmst die technische Weiterentwicklung des Gesamtsystems und bringst es gemeinsam mit uns durch die BSI-Zulassung Richtung Marktreife. Das System, das du weiterentwickelst * Mobile Wallet:  Flutter (iOS & Android) mit hardwaregestützter Schlüsselverwaltung, NFC/HCE und BLE * Plattform-Krypto-Integration:  Systemweite Bereitstellung von Zertifikaten und Kryptooperationen über die Schlüsselspeicher der Plattformen – auf iOS per CryptoTokenKit Persistent Token Extension (TKToken/TKTokenSession, geteilte Keychain Access Group, Secure Enclave), auf Android über die KeyChain-API und Samsung Knox UCM (Universal Credential Management, eSE-Plugin als JCE-Keystore-Provider) * Backend:  Python-Microservices – Issuer CA (X.509-Ausstellung), Door Station (Challenge-Response-Türöffnung), Auth Service; REST-APIs * Admin:  React-Dashboard zur Credential- und Nutzerverwaltung * Windows-Logon:  Custom Credential Provider (C++/COM), .NET 8 Windows Service mit BLE-Anbindung, WinUI-3-Pairing-App, WiX-MSI-Installer * Infrastruktur:  Zitadel (OIDC), step-ca, Supabase, ntfy; Deployment auf Hetzner Cloud; CI/CD mit GitHub Actions; Code Signing Deine Aufgaben * Technische Verantwortung für die Weiterentwicklung des gesamten SecureID-Stacks – von der Mobile App über das PKI-Backend bis zu den Plattform-Integrationen * Ausbau des Austauschs von Kryptomaterial und -operationen mit den Betriebssystemen: CryptoTokenKit-Token-Extension und Keychain-Integration auf iOS, KeyChain-Provider und Knox-UCM/eSE-Anbindung auf Android – damit Drittanwendungen (Mail, Browser, VPN) SecureID-Zertifikate nutzen können, ohne dass Schlüsselmaterial die sichere Hardware verlässt * Begleitung des BSI-Zulassungsprozesses: Audit-Vorbereitung und Härtung nach BSI TR-03161 und TR-02102-1, Kryptokonformität, Threat Modeling, Pentest-Begleitung sowie Kommunikation mit Prüfstellen * Design und Implementierung neuer Features (z. B. Credential-Lifecycle, externe IdP-Anbindung, Smart-Lock-Integrationen) * Weiterentwicklung des Windows-Logon-Pfads (Credential Provider, CNG-Key-Storage-Provider-Bridge) als eines von mehreren Plattform-Features * Pflege von Build-, Signing- und Release-Prozessen sowie Ausbau der Testabdeckung; technische Dokumentation und Abstimmung mit Partnern und Pilotkunden DAS BRINGST DU MIT: Must-have * Mehrjährige Berufserfahrung in mobiler und/oder systemnaher Softwareentwicklung (z. B. Swift/iOS, Kotlin/Android, C#/.NET, C++) * Solides Verständnis von Public-Key-Kryptographie und PKI: X.509-Zertifikate, ECDSA, Zertifikatsketten, Challenge-Response-Verfahren * Erfahrung mit plattformnahen Krypto-APIs und Hardware-Schlüsselspeichern: Apple Keychain Services / Secure Enclave, Android Keystore bzw. KeyChain – idealerweise mit CryptoTokenKit-Extensions oder Samsung Knox UCM * Praktische Erfahrung mit BSI-Zulassungs- oder Zertifizierungsverfahren (z. B. nach TR-03161, TR-02102 oder Common Criteria) – du hast einen solchen Prozess bereits aktiv begleitet * Bereitschaft, sich in den breiten Stack einzuarbeiten: Flutter/Dart, Python, React, Windows-Interna – du musst nicht alles können, aber alles anfassen wollen * Selbstständige, strukturierte Arbeitsweise; Erfahrung mit Git, CI/CD und sauberer Dokumentation * Deutsch und Englisch in Wort und Schrift Nice-to-have * Secure-Element-Entwicklung: eSE, PIV-Applets, JavaCard, APDU-Protokolle * BLE (GATT, LESC-Pairing) oder NFC/HCE-Entwicklung * Windows-Interna: Credential Provider, LSA, CNG/KSP, Kerberos/PKINIT, MSI/WiX * Zitadel (oder vergleichbare OIDC-IdPs), step-ca, Supabase, Linux-Server-Betrieb (Hetzner) * Samba/Active-Directory-Integration WARUM SALTROCK? * Anspruchsvolle Tätigkeit: Mitarbeit an einem technisch anspruchsvollen Sicherheitsprodukt vom Secure Element bis zur Systemintegration – echter Tiefgang statt CRUD-Alltag * Gestaltungsfreiheit: Du prägst Architektur- und Technologieentscheidungen maßgeblich mit, mit kurzen Wegen in einem kleinen Team. * Arbeitsmittel auf Top-Niveau: Neueste MacBooks oder Windows Surfaces, iPhone oder Pixel inkl. Unlimited-Mobilfunkvertrag – auch privat nutzbar * Moderne Software-Stack: ChatGPT, Claude, Personio, HubSpot * Zusatzleistungen: Firmenkreditkarte inkl. Spesentool sowie Edenred City Karte (50 € monatlich) * Flexibles Arbeiten: 30 Urlaubstage + Vertrauensarbeitszeit („Come as you are“) * Standorte & Remote: Homeoffice-Möglichkeit und moderne Offices in Münster, Köln und Leverkusen * Weiterentwicklung: Fachzertifikate sowie Leadership- und Soft-Skill-Trainings sowie Zugang zu Plattformen wie LinkedIn Learning oder Udemy

ng-voice

ABOUT US Committed to building the next generation of 100% software-based mobile networks, combining DevOps with telecommunications expertise, ng-voice is creating innovative mobile infrastructure solutions and making them accessible for operators and enterprises that want to deploy future-proof networks.     We're hiring a talented Senior software engineer (m/f/d) to join our team in developing the next-gen features and applications for our IMS solution. As a Senior software engineer (m/f/d), you'll build complex applications, optimize solutions, and improve operational efficiency. The ideal candidate has expertise in telephony, Kamailio, SIP, Diameter, and cloud-native technologies like Kubernetes.  TASKS What you’ll do      * Develop the next generation of features and applications for our IMS solution using a test-driven development approach  * Collaborate with a passionate team to develop the next generation of features and applications  * Perform testing, validation, and optimization of solutions to ensure high-quality deliverables  * Identify opportunities to improve operational efficiency and propose innovative solutions  * Work with technologies such as Kamailio, Redis, MySQL, SIP, RTP, Diameter, C, Python, and Bash  * Opportunity to work on the full spectrum of IMS nodes: P-CSCF, S-CSCF, I-CSCF, RTP-Engine, MMTel, HSS, PCRF, DRA, BGCF, TOPOS, TADS, E-CSCF  * Understand 3GPP specs and incline the IMS solution to the standards  REQUIREMENTS Our ideal new colleague      * Strong programming skills in Kamailio, and knowledge of Go or Python is considered a plus. * Experience with Kamailio is highly desired but not a must * Knowledge of telephony and signaling standards, such as SIP and Diameter  * Experienced and very comfortable working on UNIX/Linux operating systems  * Strong problem-solving and analytical skills  * Self-motivated and able to work autonomously  * Ability to adapt to a fast-paced and dynamic work environment  * Proficiency in English  BENEFITS A little more about our culture and why you should join   * Work-Life-Balance is a priority: Flexible working that suits you - we live and breathe a hybrid remote culture and don't mind where and when you work    * We are committed to building a diverse team that represents a variety of backgrounds, perspectives, and skills in a traditionally not very diverse industry    * We offer you the culture of a fast-growing start-up with the maturity of an enterprise company * We are more interested in your experience and knowledge than formal degrees  * Entrepreneurial culture and flat hierarchies    * Mobility benefit, fitness benefit, language class benefit and wellness benefit (for full-time employees) * Home office budget (for full-time employees) #LI-MCI