GUI Developer

Japan·Tokyomid

OtherDeveloper

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Quick Summary

Overview

Company IntroductionPolymer Capital Management is a market-neutral, multi-manager investment platform based in and focused on Asia. Polymer combines established institutional support and deep knowledge of local financial markets with a dedication to discovering and developing the region's best…

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Company Introduction
Polymer Capital Management is a market-neutral, multi-manager investment platform based in and focused on Asia. Polymer combines established institutional support and deep knowledge of local financial markets with a dedication to discovering and developing the region's best investment talent. Polymer was established in conjunction with PAG, one of the world's largest Asia-focused alternative asset managers, in 2019.

Role Overview
We are seeking a Senior Trading System Front End GUI Developer to lead the design and development of mission critical trading interfaces used by portfolio managers, traders and execution support teams at Polymer.

You will own and evolve real time, latency sensitive trading applications where correctness, speed, and clarity directly affect trading outcomes and P&L. You will act as a technical authority for user facing execution systems, shaping the UI architecture, defining standards, and mentoring others while remaining deeply hands on.

Core Responsibilities

Ownership of Trading GUIs

Own the end-to-end lifecycle of trader-facing applications
- Order entry and execution management
- Real‑time blotters (orders, trades, positions, P&L)
- Market data and analytics visualization
Act as the primary technical decision‑maker for front‑end architecture and UI patterns
Incorporate disparate requirements from a diverse group of portfolio managers and traders into a coherent design
Employ modern application packaging and distribution for easy user-initiated installation

Real-Time & Latency-Sensitive Systems

Build GUIs that handle high volume of updates scaling up to a few million events and handle market‑open and event‑driven stress scenarios
Ensure deterministic UI behavior under load (no freezes, no stale states, no incorrect displays)
Optimize rendering, threading models, and event pipelines for performance

Trader & PM Enablement

Partner directly with traders and PMs to:
- Design workflows that minimize reaction time
- Optimize keyboard‑driven and automation‑friendly interaction

Risk & Control Integration

Implement pre‑trade and post‑trade risk visibility directly in trading screens
Ensure UI behavior aligns with internal controls and compliance expectations

Architecture & Platform Leadership

Define standards for:
- UI state management
- Real‑time messaging contracts
- Error handling and fail‑safe behavior
Collaborate with backend teams on:
- OMS / EMS APIs
- Messaging schemas
- Performance tuning across the stack
Contribute to long‑term platform evolution, not just feature delivery

Required Experience & Skills

Trading Systems Experience (essential)

Significant experience building front‑end applications for execution in Equities and Derivatives markets.
Deep understanding of:
- Order lifecycles (new, amend, cancel, fill, reject)
- Trading workflows across PM → trader → execution
Comfortable discussing trading logic with non‑engineering stakeholders

Front-End Technological Depth

Deep expertise in C# and .NET for desktop applications
Expert‑level experience in at least one of:
- .NET / DevExpress Winform
- Advanced Web UI such as Angular in real‑time contexts
Strong grasp of:
- Event‑driven architectures
- Concurrency and threading models
- Performance profiling and optimization
- Application communication protocols like HTTP, Soup, REST and FIX

Expectations

8+ years professional software engineering experience
Demonstrated ability to:
- Design systems, not just screens
- Make pragmatic architectural trade‑offs
- Review and elevate the quality of others’ code
Comfortable operating with high autonomy and minimal process