fullstack typescript · ai systems · fintech

Serge Junior Libock

Software engineer building production systems end-to-end.

NestJS & Spring Boot backends, AI systems, and fintech-grade reliability. 4+ years, TypeScript-first — currently completing a FINTRAC compliance platform under contract.

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available for remote & contract work

About me

Software engineer with 4+ years shipping production web and mobile systems end-to-end — from NestJS / Spring Boot APIs and PostgreSQL data layers to Next.js, React, and React Native clients.

Currently completing a FINTRAC compliance platform under contract, and a software engineer on Tefo, a core banking system serving 100,000+ clients — where I built a production RAG code-review agent and a Blockly→DSL accounting engine.

TypeScript-first across the stack, with applied AI training from Johns Hopkins University. I care most about FinTech, regulated systems, and AI built into real products.

Skills

core stack

TypeScriptNestJSNext.jsPostgreSQLRAGReact Native

Languages

TypeScript · JavaScript · Java · Kotlin · C

Backend

NestJS · Node.js · Express · Spring Boot · Prisma · Socket.io · GraphQL

Frontend

React · Next.js · React Native · Ant Design · Formik · React Query · Zustand · Tailwind

Databases & Cache

PostgreSQL · MySQL · MongoDB · Redis

DevOps & Build

Docker · Firebase · Turborepo · GitLab · Bitbucket · Jenkins · AWS (foundations)

Auth & Identity

NextAuth · Keycloak · OAuth 2.0 · JWT

Testing & Quality

Jest · Cypress · Testing Library · JUnit · Mockito · SonarQube

AI / Applied

Anthropic API · RAG · LLM

Tooling & Process

Git · GitHub · UML · MermaidJS · Confluence · Jira

Languages

French (Native) · English (C1, IELTS) · German (B1, Goethe Institut)

Selected projects

MobileWeb

Blitz

Self-directed fullstack TypeScript project — a real-time multiplayer skill-gaming platform (chess, checkers, 8-ball pool) shipping as both a React Native Android app and a Next.js 14 PWA over a single modular NestJS backend. Sole engineer across backend, frontend, and CI/CD. End-to-end architecture: 74-feature MVP and v1.x roadmap, threat model, surface-aware compliance design covering wallet, KYC, and real-money policy across native and PWA surfaces.

NestJS
Next.js
React Native
TypeScript
Prisma
PostgreSQL
Redis
Socket.io
Turborepo
Bitbucket
Docker

FintechAIWeb

Tefo CBS

A Core Banking System for banks with an accent on flexibility and configurability. It achieves this through a number of engines such as the View Engine for configurable filters, an accounting engine for full customization of accounting schemes, a custom field engine for customized KYC forms and a validation engine for customized validation workflows.

Next.js
TypeScript
Turborepo
Ant Design
Formik
React Query
Google Blockly
SCSS
i18n
SpringBoot 3.0
Java
Postgres
MongoDB
Jenkins
Docker
Argo CD
Bitbucket
Jira

FintechMobile

Microfi Collecte

A mobile-money field-collection platform for microfinance agents collecting deposits in the field — a React Native agent app, a Next.js back-office, and a Spring Boot backend. Features per-agent cash-ceiling enforcement, multi-factor authentication, real-time agent tracking, and end-of-day settlement to the main agency.

React Native
Expo
GitLab
Redux
Formik
Yup
Jest
React Native Testing Library

Sara Mobile Banking Application screenshot 1

Sara Mobile Banking Application screenshot 2

Sara Mobile Banking Application screenshot 3

FintechMobile

Sara Mobile Banking Application

Mobile banking app allowing customers of Afriland First Bank Cameroon to perform transactions, pay subscriptions, or check their records, all within the palm of their hands.

React Native
Kotlin
React Native Testing Library
GitLab

UFood Restaurant Management System screenshot 1

UFood Restaurant Management System screenshot 2

UFood Restaurant Management System screenshot 3

Web

UFood Restaurant Management System

Multi-tenant SaaS. Users can manage their restaurants, employees and deliveries as well as provide support to customers.

React
JavaScript
Tailwind
Redux Toolkit
Git
GitHub

Web

AttendanceX

A multi-tenant SaaS allowing tenants to manage attendance, schedule newsletters, configure templates, manage users and generate reports.

Next.js
TypeScript
Tailwind
Firebase
Node.js

Experience

PKFokam Research Center

Feb. 2023 - Present

Yaoundé, CM · Full-time · Onsite · visit

Software Engineer· Tefo CBS

Oct. 2023 - Present

Highlight: Blockly→DSL accounting-schema generator (350% efficiency gain for bank accountants) and an end-to-end Cypress suite (~620% QA speedup).

Software engineer on Tefo, a Core Banking System for Afriland First Bank South Sudan (100,000+ clients, 24/7 SLA) integrating 19 banking microservices. Designed and built @tefo/mr-review, a production RAG code-review agent (Node + Anthropic API) that pulls per-MR context from Jira, Confluence, GitLab and live Swagger contracts and posts inline review comments. Built a Blockly-based visual editor that compiles to an in-house DSL — interpreted at transaction time to drive the accounting engine — plus an in-app CopilotKit assistant. Contributed to the accounting-engine service, architected the client monorepo (Turborepo) with a strict domain-driven structure, and translated banking-expert requirements into technical specs across 90+ modules.

React
Next.js
TypeScript
Ant Design
Formik
React Query
Turborepo
Google Blockly
Cypress
SCSS
Docker
Bitbucket
Jira
SonarQube
Node.js
Anthropic API
RAG
LLM

Backend Engineer· Tefo CBS

Aug. 2025 - Present

Highlight: Cross-stack ownership on Tefo CBS, from API contracts down to UI.

Expanded scope to backend on Tefo CBS as feature demand grew, delivering end-to-end features across the Java/Spring Boot microservices and the Next.js frontend.

Java
Spring Boot
PostgreSQL
MongoDB
Jenkins
Docker
Argo CD
Bitbucket
Jira

Mobile Engineer· SARA Mobile Banking

Feb. 2023 - June 2024

Highlight: Led the delivery of the transfer feature, contributing to 7,500 active users and generating ~$30,000 USD in revenue in the first month.

Owned the maintenance and evolution of SARA by Afriland, a React Native mobile banking app serving Côte d'Ivoire and Liberia. Designed and shipped revenue-generating features including utility bill payments and wallet-to-wallet transfers across Orange Money, MTN MoMo, and E-Wallie.

React Native
i18next
Redux
Jest
Testing Library
Expo
Kotlin
GitLab

Knowledge for Africa's New Uprising

Sept. 2025 - Present

Yaoundé, CM · Full-time · Onsite

Software Engineer· KANU Platform

Sept. 2025 - Present

Highlight: Bootstrapped the entire frontend stack from scratch, replicating proven patterns from Tefo CBS to accelerate delivery.

Set up the KANU platform frontend on Next.js, applying the patterns and tooling established for Tefo CBS. Driving technical decisions, code quality standards, and mentorship across the frontend team.

React
Next.js
TypeScript
Tailwind
Docker
Bitbucket
Jira

Technical Lead· KANU Platform

Sept. 2025 - Present

Highlight: Set the architecture and delivery standards for a new platform, reusing proven Tefo patterns to accelerate delivery.

Drive technical architecture, roadmap, and feature definition for a pan-African knowledge-sharing platform connecting researchers, think-tanks, and policymakers. Translate mission and stakeholder needs into a technical plan — collaboration spaces, governance frameworks, and opportunity marketplaces — balancing scope against engineering capacity.

Jira
Confluence
MermaidJS

Cameroon Telecommunications

Jan. 2020 - Jul. 2020

Yaoundé, CM · Internship · Onsite · visit

Junior Software Developer

Jan. 2020 - Jul. 2020

Highlight: Developed a software application for monthly evaluation of employees through multiple choice questions.

Worked as an intern on the development of a software to evaluate employees using Java 8, JavaFX and SceneBuilder learned on premise

Java

Self-employed (Freelance)

Feb. 2022 - Present

Remote · Freelance · Remote

Freelance Software Developer· Client projects

Feb. 2022 - Present

Highlight: Delivered React/Next.js and React Native projects across web and mobile.

Designed and maintained web/mobile applications for clients in events, catering, and digital services. Developed "AttendanceX," an event management app featuring real-time attendance tracking and schedule management. Built "UFood Restaurant," a full-stack platform including a customer web and mobile app, a restaurant dashboard, and internal logistics tools. Implemented modular frontend architectures, integrated REST/GraphQL APIs, and managed push notifications and payments.