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Responsibility: Add API or WebSocket integrations using a digital asset business API and show the result in the service flow. Implement database changes with SQL migrations and provide a clear before / after migration report. Connect API / WebSocket and migrated data through the microservice path to a basic frontend result. Design and improve REST / WebSocket services with attention to correctness, latency, rate limits, and failure handling. Write useful tests and explain what they protect; senior candidates should automate repeatable checks. Analyse the completed system and present practical optimization options with trade-offs. Qualifications: Pass the English pre-filter under Section 3. TOEIC 550 or higher is the primary reference; accepted alternatives and expired scores are allowed. 3+ years of hands-on experience as a Backend Developer or in an equivalent backend engineering role. Strong hands-on Python experience is required. SQL, REST API, WebSocket, database migration, Git, and code-review experience. Ability to write tests and explain correctness, failure modes, and performance trade-offs. Comfort working in a small team with high ownership and incomplete specifications. Preferred qualifications : Rust, Go, or another backend language in addition to Python. Market-making, algorithmic, quantitative, exchange, fintech, crypto, or banking experience. PostgreSQL, ClickHouse, Kubernetes / EKS, CI/CD, observability, HMAC authentication, or rate-limit handling. Experience with low-latency systems, order books, market data, or trading workflows. System diagrams, automated tests, software craftsmanship, or quantitative-trading projects. Want to build the backend behind real-time digital asset trading? Liqflow is looking for a Backend Developer ready to work with digital asset business APIs, WebSockets, SQL migrations, and systems that demand millisecond-level precision in the world of market-making. You'll get full ownership on a small, fast-moving team, make your own calls, and see your work go live in real financial markets. If you thrive on performance and reliability challenges and want to work close to the Fintech / digital asset business, this role is for you.
Here's where they are and how to stand out in your next interview.
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Most developer ads you'll see are written in English: 18,397 of the 24,795. That doesn't tell you whether the job itself requires you to speak English or work in English daily, so read each posting carefully. Don't assume the language of the ad matches the language of the team.
The employers posting the most developer roles are Link Group (369 jobs), Upvanta (257), jobgether (226), and OfferZen (212). If you're applying to any of these, research their hiring patterns. They move fast and post often, which means they're either scaling hard or replacing people who didn't fit.
In your interview, expect this: 'Walk me through the last time you had to debug something that took you more than an hour. What was it, what did you try first, and what would you do differently?' Hiring managers ask this to see if you think systematically or just try random fixes. Have a real example ready with specifics.