Back End Developer

Backend Developer — Trading Systems

Remote · Full-time · Portugal

Build with us

JST Digital is a global financial services firm focused on cryptocurrencies and digital assets,

providing liquidity, market-making and financial solutions to institutional investors and blockchain

companies. Founded by a team of highly experienced traders and risk managers from institutional

finance, we deliver sophisticated financial products and services to companies and foundations in

the digital ecosystem, as well as to investors looking to improve their return on digital assets.

We run algorithmic trading systems across multiple cryptocurrency exchanges around the clock.

We're a small, technically driven team where every engineer's work has a direct and measurable

impact on production trading. If you want to work close to the metal, solve real problems under real

constraints, and see your code have an impact the same day you ship it, this is the place for you.

Your impact

You will join the team responsible for the core trading infrastructure that powers JST's

market-making and execution operations. This includes exchange connectivity, order lifecycle

management, and the backend systems that keep everything running reliably 24/7 across a growing

number of venues.

You won't just be building prototypes or writing code that sits in a backlog. You will be contributing

directly to the production systems that handle live orders and real capital. Your work will involve

building and maintaining exchange connectors over REST and WebSocket APIs, extending our

Order Management System, debugging production incidents under time pressure, and improving

the observability and resilience of our infrastructure. This is a hands-on engineering role where the

quality of your debugging matters as much as the quality of your code.

Your responsibilities

• Build and maintain exchange connectivity across major cryptocurrency venues, handling order

submission, fills, cancellations and real-time market data ingestion.

• Analyze trading history and resolve production incidents: trace fills, diagnose exchange

connectivity issues, write reconciliation scripts, and deliver root cause analyses.

• Create and operate monitoring and alerting tools to ensure issues are caught before they

reach the trading desk.

• Manage and tune cloud infrastructure — process orchestration, resource allocation, and log

management.

• Write tooling and automation for trade operations, data extraction, and day-to-day platform

tasks that keep the team moving.• Support the trading desk by keeping production systems healthy, diagnosing issues as they

arise, and ensuring the platform is always available and performing.

What you'll bring

• A degree in Computer Science, Electrical Engineering, or equivalent. A higher degree and/or

several years of experience is a plus but not required.

• A minimum of 1 year professional coding experience with Python, C++ or similar language.

Candidates without professional experience in Python or C++ must demonstrate strong

proficiency in one of both.

• Solid understanding of asynchronous and concurrent programming patterns, as well as

object-oriented and functional programming paradigms.

• Familiarity with networking fundamentals and experience integrating with third-party APIs.

• Comfortable with Linux, shell scripting, version control, and command-line debugging tools.

• A support-oriented mindset — you take ownership of problems end-to-end, communicate

clearly with the people depending on your work, and take pride in keeping systems running.

• An evidence-driven debugging approach — you read logs, form hypotheses, and narrow down

problems methodically.

• Comfort working in a fast-paced environment where production issues require quick, careful

response.

• Experience with cloud infrastructure, time-series databases, in-memory data stores, or

process management tools is a plus.

• No prior finance or crypto experience is required — curiosity and willingness to learn market

mechanics on the job is what matters.