{"id":64999,"url":"https://alion.io/job/the-codest-midsenior-fullstack-engineer-javakotlin-javascript","title":"Mid/Senior Fullstack Engineer (Java&Kotlin + JavaScript)","company":{"id":2884,"name":"The Codest","domain":"thecodest.co","url":"https://alion.io/company/the-codest","size_band":null,"is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Recruitee","truth_index":null},"role":"Backend","role_family":"Backend","seniority":"senior","employment_type":"full_time","work_mode":"remote","remote_scope":"stated_countries","remote_scope_basis":"board_field","remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Warsaw, Poland"],"countries":["PL"],"hiring_countries":["PL"],"hiring_countries_total":1,"salary":{"min":20000,"max":27000,"currency":"PLN","period":"month","gross":null,"usd_annual":86616},"salary_estimate":null,"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"JavaScript","optional":false},{"name":"Kotlin","optional":false},{"name":"LangChain","optional":false},{"name":"React.js","optional":false},{"name":"Swagger","optional":false},{"name":"TypeScript","optional":false},{"name":"AI Agents","optional":true},{"name":"Copilot","optional":true},{"name":"LangGraph","optional":true}],"status":"live","first_seen_at":"2026-08-20T10:39:54Z","employer_posted_date":null,"last_verified_at":"2026-08-20T10:39:54Z","board_verified":false,"closed_at":null,"days_open":58,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":58},"description":"Hello World!\nWe are The Codest - International Tech Software Company with tech hubs in Poland delivering global IT solutions and projects. Our core values lie in \"Customers and People First\" approach that prioritises the needs of our customers and a collaborative environment for our employees, enabling us to deliver exceptional products and services.\nOur expertise centers on web development, cloud engineering, DevOps and quality. After many years of developing our own product - Yieldbird, which was honored as a laureate of the prestigious Top25 Deloitte awards, we arrived at our mission: to help tech companies build impactful product and scale their IT teams through boosting IT delivery performance. Through our extensive experience with product development challenges, we have become experts in building digital products and scaling IT teams.\nBut our journey does not end here - we want to continue our growth. If you're goal-driven and looking for new opportunities, join our team! What awaits you is an enriching and collaborative environment that fosters your growth at every step.\nProject Description:\nOur client is one of the largest e-commerce platforms in Europe, used by millions of users every day. The company connects sellers - from small businesses to global brands - with customers, offering a vast product selection, fast delivery, and a well-crafted shopping experience.\nThe subject of the contract is the provision of professional services within the New Ventures Core Tech area. This area focuses on launching innovative services with external strategic partners. Under the operational model, external partners predominantly integrate by calling the Purchaser's APIs.\nEngineer in this project will act as a technical leader and the architectural anchor for these integrations.\nThe role:\nAPI Design & Partner Integration: Facilitating seamless onboarding of external partners by designing robust API contracts, writing high-quality developer documentation, and creating mock environments.\n\nFrontend Development: Driving the development of modern web interfaces (including checkout paths, landing pages, and discovery hubs) that consume the integrated partner services.\n\nTechnical Leadership: Bridging Java backend design with modern frontend development to ensure cohesive, end-to-end technical implementation.\n\nJob requirements\nDeep, hands-on experience in Java (and Kotlin).\n\nStrong track record in designing, building, and scaling RESTful APIs (API-first design, OpenAPI/Swagger).\n\nExcellent frontend skills: proficiency in moder JavaScript/TypeScript and a modern framework (React is highly preferred).\n\nSolid understanding of distributed systems, integration patterns, and secure authentication (OAuth 2.0, OpenID Connect).\n\nProven ability to define coding standards, lead technical discussions, and design flexible \"API contracts\" for external B2B partners.\n\nEnglish level min. B2+\n\nAvailability for the Incident Response service.\n\nNice to have:\nExperience dealing with data isolation and security standards\n\nEagerness to explore and implement Agentic AI tools (e.g., Copilot, LangGraph) to accelerate engineering workflows.\n\nOur offer:\n20-27k PLN on a B2B contract\n\nAccess to the Worksmile platform\n\nA work environment that values growth and innovation - you bring the ideas, and we want to hear them\n\nRecruitment process:\n30-minute screen with our recruiter, Justyna\n\nTechnical Verification Meetings\n\nStakeholder meeting\n\nOffer\n\nQuestions, insights? Feel free to reach out to our recruiting team:\n\nIn the meantime, feel free to visit\n\nour website\nwhere you can find key facts about us.","description_format":"text","description_chars":3649,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":[],"hiring_locations":[{"name":"Poland","iso":"PL","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["IT Outsourcing & Dedicated Teams","Custom Software Development","IT Staffing & Staff Augmentation"],"lifecycle":[{"event":"open","at":"2026-08-20T10:39:54Z"}],"visa":[],"liveness":{"score":16,"band":"cold","label":"Long shot","p_open":0.4,"p_active":0.741,"p_room":0.55,"age_days":57,"expected_fill_days":56,"reasons":["seen:57","velocity","win:tail"],"computed_at":"2026-10-17T05:46:00Z"},"pay":{"stated_usd_annual":86616,"is_top_pay":false},"html_url":"https://alion.io/job/the-codest-midsenior-fullstack-engineer-javakotlin-javascript","json_url":"https://alion.io/job/the-codest-midsenior-fullstack-engineer-javakotlin-javascript.json","meta":{"generated_at":"2026-10-17T17:23:20Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":23919,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-18T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":2884},"rest":"https://alion.io/mcp/rest/get_company?id=2884"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fthe-codest-midsenior-fullstack-engineer-javakotlin-javascript"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Fthe-codest-midsenior-fullstack-engineer-javakotlin-javascript"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Fthe-codest-midsenior-fullstack-engineer-javakotlin-javascript"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/the-codest-midsenior-fullstack-engineer-javakotlin-javascript\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fthe-codest-midsenior-fullstack-engineer-javakotlin-javascript"}]}