Blockchain & Backend Engineer

About the Position

We are seeking a Senior Blockchain & Backend Engineer with 7 years of experience in infrastructure architecture for high-throughput, fault-tolerant services. Daniel Z is a seasoned professional fluent in English and Polish, specializing in end-to-end system development, from mobile-first platforms to developer tooling.

Responsibilities

• Design and develop scalable backend services
• Write clean, maintainable code
• Collaborate with frontend teams to ensure seamless integration
• Handle data modeling, API design, and smart-contract integration
• Work with technologies like AWS, Terraform, Kubernetes, Docker, PostgreSQL, Redis, and Grafana

Requirements

• 7+ years of experience in backend engineering
• Proficiency in Golang, Python, Rust, TypeScript, JavaScript, Solidity
• Experience with React Native and React.js
• Strong understanding of blockchain technologies
• Familiarity with Amazon Web Services, Terraform, Kubernetes, Docker, PostgreSQL, Redis, and Grafana

Nice to Have

• Experience with Unity, Unreal Engine, C#, Ethereum, and Kubernetes
• Knowledge of LLM, AWS SDK, and Grafana

We Offer

• Competitive salary
• Opportunity to work in a dynamic and innovative environment
• Remote work options
• Professional development opportunities

About the Company

[Company description if present]

Experience

XRPL Foundation

Blockchain Engineer

About the Project

An engineering project delivered for the XRP Ledger Foundation. Attendify provides proof-of-attendance infrastructure for issuing and verifying event credentials as native XRPL NFTs.

Responsibilities

• Designed a reusable Node.js SDK and Express API covering the complete event, issuance, claim, and verification lifecycle.
• Engineered batch NFT minting with XRPL TicketCreate and TicketSequence, including reserve calculations, ticket limits, paginated ledger queries, and event grouping through NFTokenTaxon.
• Integrated IPFS metadata and encoded content-addressed URIs into native NFTokenMint transactions.
• Built destination-restricted, zero-XRP distribution flows using NFTokenCreateOffer and wallet-side offer acceptance.
• Implemented challenge-response ownership verification using signed transaction memos, nonce validation, signer recovery, and issuer/taxon-filtered NFT queries.
• Added attendee indexing, duplicate-claim protection, account validation, structured error handling, JSDoc documentation, and automated API tests.
• Delivered the implementation as an open-source XRPL Foundation bounty contribution.

Skills & technologies

• Blockchain
• TypeScript
• Cryptocurrency

Ouroboros AI

Harness & Systems Engineer

About the Project

Ouroboros is an AI native level design platform for game studios and 3D production teams.

Responsibilities

• Architected agent harnesses for map ingestion, scene-graph construction, topology analysis, constraint validation, and level synthesis.
• Built staged generation pipelines spanning semantic planning, intelligent grayboxing, geometry generation, object placement, and engine-ready output.
• Designed a context layer for injecting project-specific mechanics, level-design rules, interactive-object schemas, enemies, and asset catalogues.
• Developed evaluation harnesses for reachability, spatial coherence, collisions, scale, gameplay constraints, and regression testing across generated maps.
• Engineered persistent world representations that preserved object identity and allowed individual scene elements to be edited, replaced, or removed.
• Translated game-studio requirements into machine-verifiable generation specifications and integration workflows.

Skills & technologies

• TypeScript
• Python
• LLM
• React.js
• Unity
• Unreal Engine
• React Native
• Go
• Rust
• C#
• PostgreSQL
• Redis

Helium

Documentation & DevEx

About the Project

Helium is a decentralized wireless network covering LoRaWAN IoT connectivity and mobile data offload. Following its migration from a custom L1 blockchain to Solana, the documentation had to reflect major changes to wallets, tokens, governance, network data, and developer integrations. The Docusaurus-based portal serves application developers, Hotspot operators, device manufacturers, and teams running network infrastructure.

Responsibilities

• Migrated and reorganized the Docusaurus/MDX documentation around Helium’s post-Solana architecture.
• Audited legacy L1 content, removed or updated obsolete instructions, rebuilt the page hierarchy and sidebar navigation, and maintained redirects for moved content.
• Updated technical guides covering wallets, tokens, governance, network data, and IoT infrastructure.
• Verified commands, code examples, and links against current implementations, ran production builds, and dead-link checks.

Skills & technologies

• TypeScript
• Blockchain
• React.js

Qualia

Infrastructure & AI Engineer

About the Project

Qualia is an engineering-led product studio building AI infrastructure, developer tooling, and production Web3 systems. The work spanned distributed LLM evaluation, long-running inference, AI agent harnesses.

Responsibilities

• Architected and operated distributed LLM evaluation harnesses for stateful, long-horizon inference workloads.
• Implemented checkpoint persistence, run-resumption semantics, and failure recovery so interrupted evaluations could continue without restarting from zero.
• Coordinated distributed inference workers and workload lifecycles across Kubernetes, Ray, and vLLM-based environments.
• Instrumented workers with OpenTelemetry traces and metrics, building Grafana dashboards for throughput, latency, retries, failures, and worker health.
• Developed Python AI-agent runtimes for EVM and SVM, including chain-aware tool execution and transaction workflows.
• Led architecture for RPC services, indexers, account-abstraction signing software, and EVM/SVM smart contracts.
• Mentored five engineers and interns across infrastructure and protocol work.

Skills & technologies

• Go
• TypeScript
• Python
• LLM
• Kubernetes
• Grafana
• Ethereum

Workpod Audits

Founder & Lead Developer

About the Project

WorkPod was an EVM security audit marketplace for protocols and dApp teams. Clients could define an audit scope and budget, share their codebase privately, compare proposals from independent auditors, track delivery, and release payment through decentralized escrow.

Responsibilities

• Designed and implemented the platform architecture as a Next.js application, backend services, and EVM smart contracts.
• Built wallet authentication and separate workflows for clients and auditors, covering scope creation, proposals, auditor selection, report delivery, approval, and escrow settlement.
• Implemented encrypted IPFS storage with wallet-based access for private codebases and audit reports.
• Developed onchain proof of audit credentials and flows for vulnerability submissions, review, and reward distribution.
• Owned deployment, infrastructure, security decisions, and technical delivery.

Skills & technologies

• TypeScript
• Next.js
• Blockchain
• Go
• AWS SDK
• Amazon (AWS)
• Ethereum
• PostgreSQL
• Redis

ScentArchive

Lead React Native & Go Engineer

About the Project

ScentArchive is a mobile-first discovery and collection app for people who take fragrance seriously. Users can explore perfumes by notes and accords, compare scent profiles, track their collection, and record personal impressions.

Responsibilities

• Designed the end-to-end architecture across the React Native client, Go services, data layer, and AWS infrastructure.
• Built Go APIs for fragrance search, filtering, collections, wishlists, and journal entries, including validation, pagination, and error handling.
• Modelled the fragrance catalogue and user data in PostgreSQL, adding indexes for efficient queries across perfumes, notes, accords, and brands.
• Implemented Redis caching for frequently accessed catalogue data and search results, reducing repeated database work.
• Built the mobile navigation, discovery flows, fragrance profiles, and collection-management experience in React Native.
• Owned database migrations, cloud deployment, environment configuration, monitoring, and technical delivery.

Skills & technologies

• TypeScript
• Go
• Terraform
• Amazon (AWS)
• AWS SDK
• Express.js
• Next.js
• PostgreSQL
• React Native
• Redis

GameWish

Lead Product Engineer

About the Project

Game Bucket is a mobile-first platform for discovering games, organizing a personal backlog, and sharing the experience with friends. Players can build custom lists, track what they want to play, are currently playing, or have completed.

Responsibilities

• Designed and built the product end-to-end, including its architecture, navigation, core screens, and cross-platform design system.
• Developed the Expo/React Native mobile app and React web companion.

Skills & technologies

• React Native
• React.js
• TypeScript
• Go
• Amazon (AWS)
• AWS SDK
• Kubernetes
• Terraform
• Redis
• PostgreSQL

Socksfor1 & Suhaib

Solutions & Game Developer

About the Project

Large-scale multiplayer game experiences created for major content creators and their audiences. The projects combined custom gameplay, multiplayer server, mods, and original mechanics with Kubernetes infrastructure engineered to run thousands of concurrent sessions reliably.

Responsibilities

• Designed and scaled the multiplayer infrastructure, owning workload scheduling, game-server lifecycles, and node reliability.
• Developed custom mods and gameplay systems while leading a multidisciplinary team of developers, artists, and animators from concept through delivery.

Skills & technologies

• Docker
• C#
• Unity
• TypeScript
• Go
• Kubernetes