Jejak
Persistent, self-ranking memory for Claude Code. Saves the decisions and root causes from every session into a Neo4j knowledge graph, ranks them by real use, and brings the right ones back automatically.
View on GitHub →
SamuelManalu
Senior Software Engineer
Jakarta, Indonesia
Summary
Results-driven software engineer with 7+ years of experience designing large-scale distributed systems, financial automation pipelines and high-throughput backend platforms — recognized for technical leadership, system ownership and raising engineering quality across teams.
7+years building backend systems
500K+financial transactions reconciled every week
~100bnIDR in automated payouts every month
2.1Mrequests per minute on Tokopedia recommendations
Experience
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Jan 2023 — Present
Senior Software Development Engineer
Halodoc · Indonesia's largest digital healthcare ecosystem
Owns financial automation: a reconciliation and disbursal engine that cut the financial close from 7 days to 2 hours, processing 500K+ transactions a week and ~100bn IDR in monthly payouts. Also builds AI products and tooling, and led observability upgrades across microservices.
Best Employee — Nov 2023, Jun 2024, Sep 2026
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Apr 2021 — Jan 2023
Backend Engineer
Tokopedia · Indonesia's largest e-commerce platform
Scaled the recommendation engine to 2.1M requests per minute and evolved it into a content-agnostic platform for products, videos and images, cutting memory use by 20% with a custom caching algorithm.
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Jun 2020 — Apr 2021
Engineering Squad Leader
Fintax · tax technology
Led a team of three delivering modular tax platforms (e-SPT, e-Billing, e-Filing) certified by the Indonesian Tax Authority, including the team's CI/CD.
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Jun 2019 — Jun 2020
Application Developer
PT Jasa Teknologi Informasi IBM · subsidiary of IBM Indonesia
Architected an award-winning enterprise training system and maintained core payroll, HR and finance applications.
Skills
- Go
- Java
- AWS
- Event-driven systems
- Kafka
- Redis
- Elasticsearch
- gRPC
- Data pipelines
- Financial systems design
- Oracle Cloud
- Docker & CI/CD
Projects
Seamux
See every AI agent session at once — and which one is waiting on you. Runs Claude Code, Gemini and other agent CLIs side by side, and flags the session that needs your input.
View on GitHub →BPRS HIK Syariah
Refactored legacy core-banking modules (loans, reporting, user management) to remove critical performance bottlenecks.
UPAH
An IoT "waste-to-currency" platform with real-time sensor pipelines and an automated payout ledger.
DAUN
A central hub that keeps organisational data and resources in sync across regional chapters nationwide.
Education
Universitas Indonesia
Information Systems · S.Kom (Bachelor of Computer Science) · 2016 — 2020
Let's talk
Open to conversations about distributed systems, fintech and engineering leadership.