Вакансії

Senior Full-Stack Engineer (Trading Platform)

Remote work

Flexible Schedule

Full time

You’ll join us as a Senior Full-Stack Engineer , with your main focus on TradeZella , our trading journaling and educational platform. TradeZella syncs trade data from over 500 brokers and prop-firm platforms, runs backtesting against more than a decade of historical market data, and uses AI to automatically tag and analyze trading patterns for over 50,000 active traders.

We’re currently considering an allocation across two products, so there’s a chance you’ll also spend some time working on a trading terminal, a platform for reviewing and replaying trades designed for prop firms and traders.

We work in a spec-driven way: we plan before we build. If you’re a senior engineer who actively trades (hands-on, not through bots) and cares about building better trading tools, this role is for you.

What you’ll get?

• Ownership — you’ll be involved in the full process: from specs to shipping. No ticket queue
• Product connection — you’ll use the product yourself as a trader
• AI-first team — we use AI as part of how we plan, research, and build, not just as a helper tool
• Working style — outcome-driven. We combine synchronous collaboration with focused asynchronous work, choosing the approach that best supports effective outcomes

Who we’re looking for?

A senior full-stack engineer who is also an active trader . This role requires both strong engineering skills and real trading experience. If you only code or only trade, this is probably not the right fit. We’re looking for someone who is comfortable working across product, technology, and trading.

Requirements

• 5+ years of engineering experience
• Comfortable across backend systems, including low-latency backend
• Experience with modern frontend frameworks ( React 18+ / TypeScript)
• Active, discretionary trader with 3+ years of experience: futures or crypto, day trading or scalping. Manual execution only , not primarily bot-driven. A track record of consistent profitability
• Spec-driven, AI-orchestrated development: you plan deeply and know how to work with AI agents effectively
• Experience with real-time market data: WebSocket streaming, order books, Level 2 depth
• Ability to produce your own product specs
• Ability to make UX decisions based on the UX guide and input from a UX advisor
• Fluent English (written and spoken)

Would be a plus

• Ruby and Rust (we use Rust/Axum) experience
• Experience with high-performance browser rendering (e.g. WebAssembly, ImGui, egui)
• Familiarity with trading tools like footprint charts, DOM/ladder, heatmaps, market/volume profile, CVD

Useful

Materials

• Railsware Handbook
• Great Development Culture
• Onboarding Process at Railsware
• Remote Collaboration Workflows
• How We Hire Software Engineers at Railsware
• Pair Programming
• Engineering Performance Review
• Why Become a Product Engineer?
• Pull Request Review
• Test Fest Approach

Benefits and Perks

As a part of our life-work balance, we want Railswarians to live an active and wholesome life. That’s why we take perks pretty seriously.

Check our Handbook

• Competitive compensation Let's face it: in a late capitalistic world, getting paid well certainly doesn't hurt.

• Growth opportunities Outline your growth and development plan, expand your skills, knowledge, and career horizons in a supportive and innovative environment.

• Remote and flexible schedule Railswarians live in more than 25 countries with different time zones. All of them are free to choose their most productive work time and place.

• Smart Expense policy There's an additional sum allocated to help you set up your workstation, improve your health, and learn whatever you want and how you want. No. Questions. Asked.

• Secure hardware and equipment Your productivity is our priority. Once you join Railsware, you’ll get secure equipment of your choice.

• 34 Paid days off Railswarians rest 24 days per year + 10 days to cover your national holidays.

• Regular online and offline gatherings We frequently meet online and offline to get acquainted, collaborate, build a network, and have fun together.

About SPD Technology

At SPD Technology, we bring together a team of like-minded people who are driven by the desire to bring value through their work, united in their commitment to high performance and delivering custom, cutting-edge tech solutions that drive clients’ growth. We empower our people with a culture of excellence and enable them with the opportunity to uphold their accountability to contribute on each level. We value humanity and collaboration, encourage professional and personal growth, and foster a supportive and flexible work environment where everyone’s contribution is welcomed.

About the Role

We are building a next-generation Payment Orchestration Platform designed to streamline transaction processing, boost operational efficiency, and deliver a seamless payment experience for businesses and their customers. Our solution integrates with multiple payment gateways, incorporates advanced fraud prevention mechanisms, and ensures full compliance with PCI DSS and other financial industry regulations.

As a Senior QA Automation Engineer, you will play a key role in driving the quality of our platform by designing and executing robust testing strategies across all stages of the software development lifecycle. You’ll collaborate closely with developers, business analysts, and the product team to ensure stable, high-performance, and compliant delivery of mission-critical APIs. The product is heavily API-focused, with minimal UI involvement.

Tech Stack:

• Back-End: Kotlin, Spring Cloud, JUnit, Swagger, Kafka, PostgreSQL (AWS RDS), Redis (AWS), DynamoDB, Docker, AWS
• Front-End: TypeScript, React, Vite
• QA Automation: RestAssured, MockServer, JMeter (Java DSL), Playwright, JUnit/TestNG, Docker, AWS
• CI/CD: GitHub Actions

Team Structure:

7 Software Engineers, 2 Automation QA Engineers, 3 DevOps Engineers, 1 UI/UX Designer, 1 Business Analyst, and 1 Project Manager.

Work Environment:

• Agile processes. Flexible working hours aligned with UK time zones.

As a qualified expert, You will:

• Design, develop, and maintain automated test frameworks for back-end APIs and front-end where applicable.
• Build test automation solutions from scratch or extend existing ones for API and UI testing.
• Define and implement a robust performance testing strategy using JMeter (Java DSL).
• Ensure comprehensive test coverage through functional, regression, integration, and performance testing.
• Actively participate in requirements analysis and contribute to solution design from a QA perspective.
• Collaborate closely with developers, DevOps, and product teams to ensure testability and automation at all stages of development.
• Keep test documentation up to date and contribute to sprint planning and estimation.
• Identify, report, and track bugs, driving continuous quality improvement across the product.
• Ensure all QA deliverables align with regulatory and industry standards, especially in the FinTech domain.
• Contribute to CI/CD pipeline optimization for automated testing (GitHub Actions).
• Mentor and guide a middle-level automation engineer, supporting growth and knowledge sharing.

We’re looking for you if you have

• 5+ years of experience in software development or QA engineering.
• Prior experience in FinTech or e-Commerce.
• 4+ years of hands-on experience in test automation, strongly focusing on API-level testing.
• Strong skills in Java/Kotlin, with practical experience using JUnit/TestNG, RestAssured, MockServer, JMeter.
• Solid experience in performance, load, and stress testing.
• Experience with Playwright or similar tools for UI automation.
• Solid understanding of CI/CD pipelines — experience with GitHub Actions
• Good knowledge of SQL.
• Solid grasp of QA best practices, test pyramid principles, and the SDLC.
• Solid understanding of payment systems, transaction flows, and related compliance requirements.
• Experience working in regulated environments is a strong advantage.
• Strong problem-solving skills, attention to detail, and a proactive mindset
• Language requirements: English — Upper Intermediate (B2+), Ukrainian — fluent.

Bonus points:

• Hands-on experience with AWS infrastructure.
• Familiarity with containerized environments (Docker, Kubernetes).

Reveal great tech solutions

Join the team of experts who create custom, cutting-edge tech solutions for world-renowned businesses, fueling client growth. Unleash your potential, tackle new challenges, and be part of a team that values your skills and contributions. Focus on long-term impact and building tailored, long-lasting partnerships with our clients.

Experience an agile and flexible working environment

Enjoy the freedom of fully remote work with a flexible working schedule. Empower yourself with a stable workload and a stable income, supported by provided laptops and licensed software. We focus on lasting cooperation and unite result-oriented individuals who stand on a high-performance approach to work.

Embrace the opportunity for personal and professional growth

Benefit from performance and merit reviews, elevate your skills with personal development plans, and individual learnings through the corporate library, public speaking support, and more.

Be among like-minded people

Work with a team of one mind who cares about what they do and how they do. Collaborate with top-notch experts who are always ready to help and support you through any challenges. Join company-wide tech and cultural events, and contribute to meaningful CSR initiatives that resonate with your values.Feel supported by your HR, and take advantage of our referral bonus program.

Interview steps

• Pre-screening with the recruiter.
• Technical interview.
• Manager Interview

Backend Developer 🪖DEFTECH

Офісний формат

Це не класичний веб-бекенд — наші сервіси працюють на реальних пристроях у реальних умовах: відео в реальному часі, потоки даних, інтеграції із зовнішнім обладнанням.

Що потрібно робити

• Розробляти та підтримувати сервіси на Go, Rust та Python — у парі з AI-асистентом (Claude Code)
• Працювати з відеопотоками та даними в реальному часі (GStreamer, UDP/TCP, WebRTC)
• Проєктувати міжсервісну взаємодію через Redis
• Інтегруватись із зовнішнім обладнанням через мережеві та бінарні протоколи
• Деплоїти та супроводжувати сервіси на пристроях під Ubuntu (Docker, CI/CD, GitHub Actions)
• Працювати з хмарною інфраструктурою GCP (сховища, логи, аналітика)
• Писати тести та брати участь у код-рев'ю

Що очікуємо від тебе

• 2+ роки досвіду в бекенд-розробці
• Впевнене володіння Go або Rust (і готовність працювати з обома), Python — як плюс
• Досвід роботи з Redis або аналогічними in-memory сховищами
• Впевнене знання Linux (Ubuntu) — сервіси живуть на реальних пристроях, а не лише в хмарі
• Розуміння мережевих протоколів (TCP/UDP, WebSocket)
• Досвід з Docker та CI/CD
• Впевнене користування Claude Code як частиною щоденного workflow

Буде перевагою

• Досвід із GCP або іншими хмарними платформами
• Досвід із GStreamer, FFmpeg або відеообробкою в реальному часі
• Досвід з embedded-системами або IoT-пристроями
• Досвід оптимізації продуктивності на обмеженому залізі

Ми пропонуємо

• Офіційне працевлаштування
• Конкурентну заробітну плату, залежно від досвіду та компетенцій
• Графік роботи: понеділок — п’ятниця, 9:00–18:00
• Бронювання згідно із законодавством України
• Роботу над реальними defence tech-продуктами
• Можливість професійного росту та розвитку
• Молодий, дружній та технічно сильний колектив