Senior Software Engineer (Tokens Team)
Description of the Company 🚀
Immutable is a leading global technology entity, propelling the sphere of NFTs on Ethereum. The ultimate vision is to secure the top spot as the prime environment for NFTs, granting users with empowerment and rewards. Established in 2018, Immutable swiftly ascended to unicorn status among Australian firms, accumulating over AUD $300M+ and holding a valuation of AUD $3.5 billion.
The Immutable Engineering Team lies at the core of the foremost gaming-focused NFT Trading Ecosystem worldwide. Their purpose involves crafting user interfaces that not only meet but exceed the requirements of large-scale web3 games. The team excels in tackling intricate challenges in the newest technologies, all whilst enjoying the process.
Immutable is in search of engineers within the Asia Pacific region. The entire interview process and onboarding are feasible remotely, reflecting the global experience the company prides itself on. Whether opting to work from the Sydney headquarters of Immutable or from a WeWork site in a prominent city, arrangements can be made. Moreover, relocation packages to Australia are also provided.
The ambitious goal is to materialize digital worlds, with extensive growth plans on a global scale in pursuit of becoming the primary ecosystem for NFTs. 🚀
Role Overview 🤔:
Within the Tokens team exists a closely connected interdisciplinary group comprising four full-stack engineers, one blockchain engineer, a product manager, a product designer, and an engineering manager. Their collective mission involves reinforcing digital assets within the Immutable framework and fostering reward schemes for Immutable and associated partners.
Cohesion is a key trait of this team, as they are zealous about creating exceptional products, collaborating on decisions, and advancing towards shared objectives.
In line with the expansion of Immutable's business endeavors, a quest unfolds for remarkable engineers keen on confronting demanding challenges in the present globally stimulating landscape.
Exceptionally skilled full-stack software engineers fueled by a passion for cutting-edge technology are encouraged to consider this captivating opening.
Empowerment Highlights 🎮:
- Embark on projects encompassing the full tech spectrum (back-end + front-end + blockchain) to yield customer-centric solutions.
- Engage with various stakeholders, extending up to the Founders themselves, to ascertain optimal product resolutions.
- Foster alliances with a multitude of ecosystem partners.
- Deepen engagement in a Web3 development milieu, where avenues for blockchain development learning are routine.
- Participate in a collaborative team atmosphere.
- Embrace an experimental realm, learning and evolving products based on customer feedback.
- Ensure operational excellency for your team's services in alignment with team members.
- Cultivate improved methodologies within your team workflow continually.
Desired Skills and Traits 🤝:
- Proficiency in Go or Typescript (preferable; openness to skilled generalists is also considered).
- Dedication to full-stack development (mandatory).
- Proficiency in crafting clean, efficient, testable, and sustainable code (compulsory).
- Capacity for designing scalable and resilient system frameworks.
- Acumen in formulating informed decisions regarding data modeling, API design, and the overall structure of backend systems.
- Experience or proclivity towards paired programming.
- Familiarity with cloud-related technologies and services.
- Strong verbal and written communication abilities.
- Aptitude for articulating complex notions to both technical and non-technical audiences.
- Ability to resolve disputes and conflicts in a constructive manner, with a firm commitment to attaining optimal outcomes.
- Solid problem-solving skills alongside a keen eye for detail.
- Interest in or experience with web3, DeFi, and gaming.
- Eagerness to contribute actively in shaping the product direction for the team.
- Ability to question and deliberate over product-related choices.
- Customer-centric mindset coupled with empathy.
- Capability to function both independently and within a team-oriented setup.
- Exemplary communication skills -written and verbal.
Additional Insights into Our Comprehensive Benefits for Global Staff Members:
Fulfillment of Top-Talent Worldwide:
💸 Competitive remuneration globally integrated alongside contributions, with shared successes of our products through Employee Stock Options. Comprehensive support for US Employees offered via Medical and 401K Insurance
💻 Optimal office space centralized at the epicenter of Sydney, yet opportunities for remote office hubs donated worldwide through the WeWork all-access facility
📲 Allocation of USD $500 for WFH apparatus setup every year coupled with USD $600 annually toward internet and phone utility.
Elevating Your Expansion:
🌱 Accrual of up to USD $1,350 annually earmarked for classes, seminars, or events endorsing your development.
📚 Benefit from complimentary access to online educational courses via Udemy.
Enhancing Your Well-Being:
💆🏽♀️ Yearly contribution of USD $800 set aside for health and wellness purposes.
🤗 Unrestricted entry to counseling services around the clock, extended to you and your immediate family through our Employee Assistance Program (EAP) Service.
🎁 Reap premium access to mindfulness resources, online fitness sessions, and varied retail discounts via Perkbox.
Availability of Leave When Most Needed:
👨👧👦 New parents presented with 12 weeks of paid parental leave under our gender-neutral policy, with an additional six weeks designated for the birthing parent facilitating rest and recovery pre and post-delivery. Support for Miscarriage Leave and supplemental leave for IVF treatments also provided.
🎂 Indulge in 2 extra paid annual leave days towards year-end celebrations and a paid birthday holiday.
Extra Tidbits of Info:
Immutable strives to establish and nurture an inclusive and diverse workspace. Diverse viewpoints and experiences constitute a pivotal force propelling our success thus far. Therefore, candidates representing all backgrounds are highly encouraged to engage with us.
An esteemed 2024 Circle Back Initiative Employer, ensuring every application receives a response.
*A brief note to recruitment agencies: Our internal recruitment team currently manages this role and, as such, outreach is deemed unnecessary - Unsolicited resumes from agencies are declined, absolving responsibility from any resulting fees. Thank you!
Embrace this pivotal role in shaping the future landscape of web3 gaming!
Senior Data Scientist / ML Engineer – Crypto Payments & Lightning Network
Bitrefill is the world's leading crypto lifestyle platform. We enable millions of users globally to pay for gift cards, mobile phone refills, and everyday goods using Bitcoin, Lightning Network, and other digital assets. Our long-term goal is to provide everyone with the tools to use crypto as real "digital money" daily — without needing to register for additional services or log into a web platform.
We are now actively building a new product: the Bitrefill crypto card for paying for goods and services in everyday life.
The Role
We are looking for a Senior DS/ML Engineer to help us make data-driven decisions across fraud detection, Lightning Network liquidity optimization, user behavior modeling, and risk scoring for the crypto card.
You won't just build models — you'll help shape the ML infrastructure of a fast-growing crypto-payments startup.
What You'll Do
Fraud & Risk ML — Develop anomaly detection models, transaction scoring for withdrawals, and real-time predictive rules to flag suspicious activity.
Lightning Network optimization — Build models to optimize payment routing, channel liquidity management, and predict channel health.
Crypto card infrastructure — Create credit risk models and user scoring for card issuance without traditional credit history.
LTV & churn prediction — Forecast user behavior to improve retention and conversion, especially in low-crypto-adoption countries.
Product & growth analytics — Develop ML-driven hypotheses for A/B testing and recommendation systems (e.g., which gift cards to offer).
Data pipeline & MLOps — Help build pipelines for training and deploying models to production (alongside engineers).
Requirements
5+ years of experience in Data Science / Machine Learning, ideally in fintech, payments, crypto, or high-throughput transactional systems.
Strong experience building anti-fraud models, time series forecasting (for transactions), LTV predictions, or classification/clustering models.
Python — solid proficiency (pandas, scikit-learn, xgboost/lightgbm; PyTorch/TensorFlow is a plus).
SQL — advanced level.
Experience with Airflow, dbt, or similar ETL/ML pipeline tools.
Understanding of Lightning Network basics (or strong willingness to dive deep within 1–2 weeks).
English — sufficient to discuss ML metrics and business problems fluently.
Big Pluses
Experience with graph models (Node2Vec, GNNs) for transaction chain detection.
Familiarity with blockchain analytics (on-chain data, addresses, transactions).
Experience in credit scoring without traditional credit history.
MLOps skills (Docker, Kubeflow, MLflow, or at least deploying models via FastAPI).
Personal experience using Bitrefill or crypto as a payment tool.
We Offer
Fully remote work from anywhere in the world (with ~4–6 hours overlap with Stockholm time zone).
Opportunity to build an ML system from scratch in a startup that is truly changing how people use crypto.
Competitive salary + equity (tokens) or profit-sharing.
Minimal bureaucracy — maximum responsibility and freedom.
Work with cutting-edge technologies: Lightning Network and crypto cards.
How to Apply
Send your resume and a link to your GitHub / Kaggle / project where you solved a fraud, time series, or risk modeling problem. Mention if you have experience with Lightning or blockchain analytics — if not, just tell us how quickly you can learn new domains.
Senior Software Engineer
Senior Full-Stack Developer (Web & APK) - Partnership Role
About the Role:
I am Sadr B, founder of a private development agency. I am currently building a dedicated team of elite developers to handle high-value web and mobile (APK) projects. I am not just looking for a freelancer; I am seeking a long-term partner to grow this agency with me.
The Partnership Structure:
Team Spirit: We work as a unified team. You handle the technical execution (Web/App), and I manage agency growth, strategy, and client relations.
Negotiated Rates: We do not post fixed budgets upfront. Every project is discussed in DM based on the specific client quote and requirements.
50/50 Milestone Payment: Security is our priority. Once the client pays the initial deposit, 50% of your fee is funded into LaborX Escrow immediately. The final 50% is released upon delivery and client approval.
Payment: All transactions are handled in Crypto (USDT/Polygon) for speed and transparency.
Requirements:
Expertise in Full-Stack development (React, Node.js, Flutter preferred).
Strong experience in delivering high-quality Android APKs.
A portfolio demonstrating your ability to handle professional-grade projects.
How to Apply:
Please DM me with your portfolio and a brief introduction of your experience. Let’s discuss how we can build this agency together.
Looking for a Full Stack and Blockchain Developer
Junior / Middle Metaverse Developer (Unity / Web3 / VR)
You will work with Unity, WebGL, and blockchain technologies to create engaging metaverse features and optimize them for performance across different devices. The developer will collaborate with designers and backend engineers to deliver scalable and stable products.
Requirements include experience with Unity and C#, understanding of 3D development, Web3 or blockchain basics, and familiarity with Git and API integration. Experience with VR/AR, NFTs, or multiplayer systems is a plus.
We offer remote work, flexible hours, crypto payments, and the opportunity to build innovative metaverse products.