Mobile Developer (iOS)

PT. Trimegah Sekuritas Indonesia, Tbk; Jakarta Selatan; On-site; IDR 480,000,000 - 720,000,000; Full time

Job summary

PT Trimegah Sekuritas Indonesia, Tbk is seeking an experienced iOS engineer to own the architecture, quality, and performance of the iOS app end to end. You will build core flows like order entry, portfolio, watchlist, and onboarding while handling real-time data and ensuring seamless UI even during network fluctuations.

You will mentor engineers, collaborate with compliance and security from design, and drive mobile CI/CD improvements.

Qualifications

• 5+ years of iOS development with senior-level responsibilities.
• Deep Swift; comfortable with UIKit and SwiftUI.
• Modern concurrency: async/await, Structured Concurrency, GCD.
• Architecture at scale: MVVM / VIPER / TCA, modularization, DI.
• Networking: URLSession, WebSockets, caching for flaky connections.
• Testing: unit, snapshot, and UI tests with clear test strategy.
• Performance profiling with Instruments.
• Able to explain technical decisions to non-technical stakeholders.

Responsibilities

• Own the architecture, quality, and performance of the iOS app end to end.
• Build and maintain core flows: order entry, portfolio, watchlist, history, onboarding.
• Handle real-time market data on the client with WebSocket management.
• Protect order integrity client-side with robust state handling.
• Ensure mobile security: keychain, biometrics, secure storage.
• Mentor engineers and set engineering standards for the mobile team.
• Collaborate with compliance, risk, and security from design stage.

Skills

iOS development

Swift

UIKit

SwiftUI

Concurrency

MVVM

VIPER

TCA

Dependency Injection

Networking

Tools

Xcode

CI/CD tooling

GitHub Actions

Bitrise

Job description

Own the architecture, quality, and performance of the iOS app end to end

Build and maintain core flows: order entry, portfolio, watchlist, transaction history, onboarding

Handle real-time market data on the client — WebSocket lifecycle, reconnect strategy, snapshot + delta, conflation for slow connections, and keeping the UI smooth while thousands of instruments tick

Protect order integrity client-side: client order IDs, deduplication, idempotency, and correct order state machine handling when the network drops mid-submit

Financial-grade app security: certificate pinning, Keychain storage, biometric authentication, jailbreak detection, sensitive-screen protection

Honest mobile observability: crash-free rate, hang rate, cold start, per-endpoint latency — and acting on the numbers

Mature the iOS CI/CD pipeline: automated builds, signing, TestFlight, shortening commit-to-release time

Release discipline: feature flags, staged rollout, genuinely tested rollback, and releasing outside exchange hours

Review code, mentor engineers, and set the mobile team's engineering standards

Work with compliance, risk, and security from the design stage rather than as a rubber stamp at the end

Requirements:

5+ years of iOS development, including at least 2 years carrying senior-level technical responsibility

Deep Swift; comfortable in both UIKit and SwiftUI, with a view on when each belongs

Modern concurrency: async/await, Structured Concurrency, GCD; Combine or equivalent

Architecture at scale: MVVM / VIPER / TCA, modularization, dependency injection — and the reasoning behind the choice

Networking: URLSession, WebSockets, caching, graceful behaviour on poor connections

Testing: unit, snapshot, and UI tests, with a clear point of view on what is worth testing

Performance and memory profiling with Instruments

iOS CI/CD: Fastlane, Xcode Cloud, Bitrise, or GitHub Actions

Able to explain technical decisions to non-technical stakeholders — in this industry you will do it often

Established in May 1990, now Trimegah Securities is more than just one of the largest and fully integrated securities companies in Indonesia. It is admittedly one of the most trusted securities companies in Indonesia.

Equity Capital Markets Division provides equity brokerage service and margin lending facility for retail and institutional clients. Debt Capital Markets Division facilitates government bond transactions, including Retail Government Bond, Retail Shariah Government Bond, and corporate bonds. Investment Banking Division provides bonds and equity underwriting service, arranger as well as financial advisory. Our subsidiary, PT Trimegah Asset Management, which is established in January 2011, provides clients with various types of mutual funds.

All of these are served through 17 branch offices in 13 major cities throughout Indonesia. The extensive network is expected to further increase clients′ access to Trimegah′s products and services. On top of that Trimegah is always committed to information technology development that will increase the quality of our products and services, and our operations.

Established in May 1990, now Trimegah Securities is more than just one of the largest and fully integrated securities companies in Indonesia. It is admittedly one of the most trusted securities companies in Indonesia.

Equity Capital Markets Division provides equity brokerage service and margin lending facility for retail and institutional clients. Debt Capital Markets Division facilitates government bond transactions, including Retail Government Bond, Retail Shariah Government Bond, and corporate bonds. Investment Banking Division provides bonds and equity underwriting service, arranger as well as financial advisory. Our subsidiary, PT Trimegah Asset Management, which is established in January 2011, provides clients with various types of mutual funds.

All of these are served through 17 branch offices in 13 major cities throughout Indonesia. The extensive network is expected to further increase clients′ access to Trimegah′s products and services. On top of that Trimegah is always committed to information technology development that will increase the quality of our products and services, and our operations.