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We are developing a miniApp in Telegram for exchanging cryptocurrencies for fiat and vice versa. Our service ensures fast, convenient, and secure exchange with minimal fees.

We are currently looking for a Backend Developer (Spring Boot) to continue development and support the project.

What you'll be doing:

• Developing and maintaining the backend for the Telegram miniApp using Spring Boot.
• Integrating with TronGrid (receiving/sending USDT TRC-20).
• Developing and improving the admin panel (user management, orders, exchange rates).
• Creating REST API for the frontend (Vue.js) and integrating with the Telegram bot.
• Optimizing the PostgreSQL database, setting up caching in Redis.
• Implementing secure authentication (JWT, OAuth 2.0).
• Ensuring server stability and fault tolerance.

What we are looking for:

• At least 2 years of experience with Java + Spring Boot.
• Strong knowledge of REST API, PostgreSQL, Redis.
• Ability to work with Docker (basic level required).
• Understanding of authentication principles (JWT/OAuth 2.0).
• Experience integrating external APIs (e.g., payment gateways, crypto APIs).
• Knowledge of multithreading and transaction processing.
• Basic knowledge of RabbitMQ/Kafka (nice to have, but not required).
• Experience with fintech or crypto-related projects is a plus.

What we offer:

• Salary $2500-3000 per month.
• Remote, office, or hybrid work (Czech Republic).
• Flexible working hours (full/part-time, full-time preferred).
• Opportunities for growth in crypto-fintech.
• Long-term collaboration (with potential for salary increases based on performance).

How to apply?

Send your resume + code samples (GitHub, portfolio) to Telegram @xchangio_support or email email

Looking forward to working with you! 🚀

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SideShift.ai, the direct to wallet crypto exchange, is hiring a Junior Backend Engineer.

Since launching in late 2018, SideShift.ai has been growing rapidly. With seven-figure daily volume and key industry partnerships, we have achieved a lot but there is still plenty more to do. To slot in with our stack we are looking for someone who has experience with TypeScript, PostgreSQL, Redis and GraphQL.

We are searching for a junior backend engineer who is hungry to scale up their skillset and learn on the job.

Role

• Design, build, and maintain SideShift.ai.
• Take ownership of certains aspects of the SideShift.ai backend.
• Ship. Your ideas will make it into live products in no time.

You

• Junior level experience working with tools such as TypeScript, PostgreSQL, Redis and GraphQL.
• Hungry to learn and comfortable taking initiative.
• Strong interest in working on a cryptocurrency product.
• Able to join team meetings in EU/Asia timezones (but we try to avoid meetings as much as possible).

Nice to have

• Experience with financial markets is a bonus but not necessary.
• EU/Asia timezone preferred.
• An appreciation for memes.

Perks

• Salary paid in a SideShift.ai crypto of your choice.
• Join a profitable company with traction (seven figure weekly volume) and key industry partnerships with the likes of Trezor, Blockstream, Edge Wallet and more.
• Ship from the start. Your ideas actually lead to product developments with us.
• Remote first - work wherever you feel most productive.
• Flexible vacation policy.

Please note: SideShift.ai will pay fair market rates based on your location and experience.

Gelato is an all-in-one Ethereum Rollup as a Service Platform built without limits. Designed to be super-fast, incredibly secure, and infinitely scalable, Gelato rollups allow anyone to build and deploy their fully serviced Layer 2 chains on Arbitrum, Optimism, Polygon, Celestia and more at a pace natively integrated with Web3’s favorite tools and services like Etherscan, The Graph, Pyth, Layer Zero and many more launching a production-ready web3 development environment from the Genesis block.

What we offer:

• Join one of the most technically robust teams in the crypto space, operating in a fully remote environment with our headquarters located in the crypto hub of Zug, Switzerland.
• Play a pivotal role in shaping the future of blockchain, by contributing to the development of Gelato’s Rollup-As-A-Service Platform, already trusted by leading projects like Lisk and Astar Network.
• Dive deep into cutting-edge Web3 technologies with exposure to Gelato’s premier Middleware Services stack, including Gelato Web3 Functions and Gelato Relay, foundational to top-tier applications such as MakerDAO, Connext, Abracadabra, and Pancakeswap.
• Earn and have a say with the GEL Token package, granting you a stake in the network’s future and a voice in the strategic direction of the project.
• Be backed by the best, with support from world-class investors including Dragonfly, IOSG, Galaxy Digital, ParaFi, Gnosis, and renowned figures like Stani Kulechov among others, securing your position at the forefront of the Web3 revolution.

Responsibilities:

• Design and develop scalable Web3 backend APIs, enabling seamless interaction between backend and frontend applications and the blockchain, ensuring high availability and performance for millions of users worldwide.
• Develop and maintain backend services for smart contract interaction, ensuring seamless integration and communication between smart contracts and the application layer. Focus on creating robust APIs and middleware that facilitate secure and efficient interactions with the blockchain, handling tasks such as event listening, transaction processing, and on-chain data retrieval.
• Specialize in smart contract lifecycle management, from writing and deploying smart contracts to conducting automated testing and security audits. Ensure the reliability and security of smart contracts through rigorous validation processes, upgrades, and optimizations to support flawless execution on the blockchain.
• Optimize blockchain data processing, implementing efficient methods for ingesting, storing, and querying on-chain data to support real-time analytics and user-facing applications.
• Collaborate on cross-functional projects, working closely with front-end developers and product teams to integrate blockchain functionalities into user-centric applications, enhancing overall user experience.
• Implement best practices for blockchain security, staying ahead of the latest in smart contract vulnerabilities, and employing rigorous security measures and auditing processes to safeguard all deployed contracts and back-end systems.
• Advance our infrastructure-as-code approach, taking a hands-on role in the continuous integration and delivery pipelines, ensuring that all back-end services are scalable, reliable, and secure.
• Drive innovation in Web3 technologies, researching and integrating new blockchain protocols and tools to keep the platform at the cutting edge of decentralized applications.

Requirements

• You can work autonomously on research, spec, implementation, deployment, monitoring and patching your code
• You are comfortable with Software Engineering (and a little bit of DevOps)
• You’ve extensive experience in shipping production-grade code that handles thousands of user interactions/transactions
• 4 years experience with either Node.js/TypeScript
• 4 years experience with highly scalable Web API engineering
• Strong experience with high throughput Database systems
• Strong experience with maintaining scalable microservices systems
• Good experience with distributed systems and/or container orchestration
• Strong interest in Web3/crypto industry
• Experience using crypto applications (e.g. Uniswap, Aave, etc.)

Not essential, but big bonus points:

• Experience with Web3 libraries and backend development (e.g. ethers.js, viem)
• Experience in Solidity smart contract development
• Knowledge about the inner workings of the EVM
• Experience with P2P systems and libraries (e.g. libp2p)

Technologies we use and teach:

• Node.js/TypeScript
• Golang/Rust
• GETH and its various Rollup forks
• libp2p
• RabbitMQ
• Redis
• PostgreSQL / TimescaleDB
• GCP (less AWS)
• Ethers.js
• Subgraphs
• Solidity

Benefits

• Fully remote team, with team members in Zug, Paris, New York, London, Singapore, and many other cool places.
• Competitive package with a generous token package. Get a share of the network token and be able to participate in the Gelato DAO
• Chance to participate in shaping the future of web3 by working together with the biggest projects in this space that use Gelato such as Optimism, Polygon, Arbitrum, Celestia and Eigenlayer
• World-class Investors - We are backed by the community, including industry-leading experts such as Dragonfly, ParaFi, Nascent, IDEO, IOSG and Galaxy Digital

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Job Title: Quantitative Developer   Location: London Type: Full-time Level: Mid Level Reports to: Chief Quant/ Risk Officer  Elwood Technologies is a FCA regulated firm that provides end-to-end institutional-grade digital asset Execution, Liquidity Access and Portfolio Monitoring & Risk Management Software. Built with institutions for institutions, Elwood’s EMS offers best available price execution, smart order routing and algorithmic tooling alongside a traditional finance grade Portfolio Management System.  Built by industry experts with decades of combined experience in investment management and digital technology, we are now looking for a Senior Engineer to work on our EMS platform within the Engineering Team . Job Description We’re currently looking for a Quantitative Developer to join our Quant team based in the UK. We have a mix of Quant Developers and Software Engineers bringing finance knowledge and enterprise scale software development respectively – occasionally both! The stack is comprised of C# .NET 5+ services which call into a proprietary C++ quant library and present results via a React frontend. Hosted on Linux in AWS with large calculations distributed over many instances, messaging via Redis. As part of the role, you will form an integral part of the team responsible for pricing and risk analytics available on our platform. You will contribute to the continued development of our models, whilst also working closely with the Product Team to implement new features, and provide desk support to our clients.  Key Responsibilities

Develop and enhance our in-house pricing and risk models, which are implemented in our digital Quant analytics library, written in C++. Build new services to meet critical product and business needs using C++ and Python. Build features that help customers collaborate on asset management. The functionality of the library is exposed to clients through a web based cross-asset Portfolio Management System providing clients with real time pricing, scenario, risk and P&L on their portfolios as well as the ability to structure and overlay new positions. Work with engineers, designers, product managers, and senior leadership to turn our roadmap and technical vision into a tangible product with timely deliveries. Monitor and support all Quant production system components (analytics, market data). Estimation, design, development and unit testing of features, with robust coding standards.

Qualifications / Knowledge

5+ years’ of experience developing applications in C# with good knowledge of coding fundamentals  Financial Services experience is essential (Buy or Sell-Side) Knowledge of the standard pricing models e.g. Black Scholes, sensitivities, with a strong understanding of derivatives of at least one asset class Experience working with interest rate curves, vol surfaces and other market data Experience implementing trading/risks applications in C# . Experience implementing C++ pricing libraries Strong knowledge of data structures, algorithms, and designing for performance. Great communication skills and the ability to work as part of a team – bouncing ideas off colleagues, building consensus around a design etc. - Ability to explain complicated concepts with ease Master's degree or PhD in mathematics or any other relevant numerical field.

What we offer: 💵  Competitive salary and compensation packages 🍎 Fully paid medical and discounted dental schemes for employees and their family ✈️ Generous time off + bank holidays 🍼 Enhanced parental leave for all employees who have been with the company for one (1) year 🍔 Fully stocked kitchen and access to Ubereats 💪 Discounted gym scheme with Fitness First 🐕‍ Employee Assistance Programme 📚 Paid study leave and personal leave Why Elwood?  

Join one of the fastest growing FinTech companies and help shape the future of finance A startup with deep financial backing and a strong market presence Our platform is enabling institutional access to the most exciting growth opportunity in Finance Work with a modern technology stack and help solve high impact problems Strong client focused team with a diverse background   We’re a Global company and have modern, centrally based offices in London, New York, Singapore & Jersry

Equal Opportunities As an equal opportunity employer, you can read more about our policy here: https://elwood.io/diversity/

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